RESUMO: No Brasil, a ureia é o fertilizante nitrogenado mais utilizado para melhorar a produção de forragem. No entanto, seu uso excessivo pode causar impactos ambientais por meio de perdas de nitrogênio (N), como a volatilização da amônia (NH3). Portanto, o objetivo do presente estudo foi ajustar a volatilização de NH3 da ureia aplicada em pastos tropicais em três condições de chuva utilizando modelos matemáticos. Dados foram coletados de pastos de capim-marandu (Brachiaria brizantha) adubado com 50 kg N ha-1 em condições úmidas, intermediárias e secas. A volatilização da NH3 foi medida em cinco câmaras semiabertas durante 21 dias. Os modelos, linear, quadrático, exponencial, Gompertz, Groot e Richards foram testados para ajuste e estimativa da volatilização do NH3. Os modelos de Gompertz, Groot e Richards geraram predições semelhantes aos dados observados, com alto coeficiente de determinação, indicando um melhor ajuste dessas equações aos dados, com acurácia e precisão. No entanto, o modelo Groot foi selecionado devido ao menor erro quadrático médio das predições (0,29% de N total perdido como NH3). A maior volatilização de NH3 ocorreu em condições climáticas úmida, seguido por intermediária e seca (20,2; 17,0 e 11,3% de N total perdido como NH3, respectivamente). Portanto, as perdas de N como volatilização de NH3 após a aplicação de 50 kg N ha-1, como fonte de ureia, são alteradas de acordo com as condições climáticas, atingindo a 20% do N adicionado nas condições úmidas. O modelo Groot é recomendado para ajuste e estimativa da volatilização de NH3 da ureia aplicada em pastos de capim Marandu em condições úmidas e secas. RESUMO Brasil forragem entanto N, , (N) NH . (NH3) Portanto matemáticos capimmarandu marandu Brachiaria brizantha 5 ha1 ha 1 ha- secas 2 dias linear exponencial Gompertz observados determinação precisão 0,29% 029 0 29 (0,29 NH3) úmida 20,2 202 20 (20,2 170 17 17, 113 11 3 11,3 respectivamente. respectivamente respectivamente) ha1, 1, (N (NH3 0,29 02 (0,2 20, (20, 11, (NH 0,2 (0, (20 0, (0 (2 (

ABSTRACT: In Brazil, urea is the most used nitrogen (N) fertilizer to improve forage production. However, their excessive use can cause environmental impacts through N losses, such as ammonia (NH3) volatilization. Therefore, the current study adjusted and estimated the NH3 volatilization from urea applied on tropical pastures in three rainfall conditions using mathematical models. Data were collected from Marandu grass (Brachiaria brizantha) fertilized with 50 kg N ha-1 during wet, intermediate, and dry conditions. Ammonia volatilization was measured in five semi-open chambers for 21 days. The linear, quadratic, exponential, Gompertz, Groot, and Richards models were tested for fitting and estimating the NH3 volatilization. The Gompertz, Groot, and Richards models generated predictions similar to the observed data, with a high determination coefficient, indicating a better fit of these equations to data, with precision and accuracy. However, the Groot model was selected due to the lowest root mean square error of prediction (0.29 % total N lost as NH3). The greatest N loss as NH3 volatilization occurred in the wet, followed by intermediate and dry conditions (20.2, 17.0, and 11.3 % total N lost as NH3, respectively). Therefore, nitrogen losses as NH3 volatilization after application of 50 kg N ha-1, as urea source, are altered according to the weather conditions, reaching 20% of N added in the wet rainfall period. The Groot model is recommended for fitting and estimating the NH3 volatilization from urea applied on Marandu grass pastures in the wet and dry rainfall conditions. ABSTRACT Brazil (N production However NH (NH3 Therefore Brachiaria brizantha 5 ha1 ha 1 ha- semiopen semi open 2 days linear quadratic exponential Gompertz data coefficient accuracy 0.29 029 0 29 (0.2 NH3. . NH3) 20.2, 202 20 (20.2 170 17 17.0 113 11 3 11. respectively. respectively respectively) ha1, 1, source period (NH 0.2 02 (0. 20.2 (20. 17. 0. (0 20. (20 ( (2

RESUMO: A pesquisa foi conduzida para testar a hipótese de que a inclusão de casca de café (Coffea sp.) melhoraria as características fermentativas e a qualidade da silagem de milheto (Pennisetum glaucum). Assim, objetivou-se avaliar o efeito da inclusão de diferentes níveis da casca de café na ensilagem de milheto sobre a composição química, características fermentativas e degradabilidade in situ da silagem. O delineamento experimental utilizado foi inteiramente casualizado e os tratamentos constituíram-se pela silagem da planta inteira de milheto com a inclusão de níveis crescentes de casca de café: 0%, 7%, 14% e 21%, com base na matéria natural. Após 60 dias de fermentação, as silagens foram avaliadas quanto às características químicas, fermentativas, degradabilidade in situ da matéria seca (MS) e da fibra em detergente neutro (FDN). A inclusão da casca de café não alterou (P > 0,05) os teores de proteína bruta (11,94%), FDN (44,89%) e nutrientes digestíveis totais (65,09%). Houve aumentos nas concentrações de MS e fibra em detergente ácido, acompanhados de uma redução nas concentrações de matéria mineral e extrato etéreo, à medida que se aumentou a participação da casca de café nas silagens. Houve um aumento no teor de lignina até o nível de 7,59% de inclusão da casca de café. Não houve efeito da inclusão da casca de café sobre o pH da silagem (3,60). Entretanto, a inclusão de casca de café acarretou na redução da temperatura, perdas por gases, degradabilidade in situ da MS e FDN da silagem. Recomenda-se a inclusão de casca de café até o nível de 14,0% da matéria natural para melhoria do padrão de fermentação e da qualidade da silagem de milheto. RESUMO Coffea sp. sp Pennisetum glaucum. glaucum . glaucum) Assim objetivouse objetivou química constituíramse constituíram 0 0% 7 7% 14 21 21% 6 químicas (MS FDN. (FDN) P 0,05 005 05 11,94%, 1194 11,94% , 11 94 (11,94%) 44,89% 4489 44 89 (44,89% 65,09%. 6509 65,09% 65 09 (65,09%) ácido etéreo 759 59 7,59 3,60. 360 3,60 3 (3,60) Entretanto temperatura gases Recomendase Recomenda 140 14,0 1 2 (FDN 0,0 00 119 11,94 9 (11,94% 44,89 448 4 8 (44,89 650 65,09 (65,09% 75 5 7,5 36 3,6 (3,60 14, 0, 11,9 (11,94 44,8 (44,8 65,0 (65,09 7, 3, (3,6 11, (11,9 44, (44, 65, (65,0 (3, (11, (44 (65, (3 (11 (4 (65 ( (1 (6

ABSTRACT: The research was conducted to test the hypothesis that the inclusion of coffee husk (Coffea sp.) would improve the fermentative characteristics and quality of pearl millet silage (Pennisetumglaucum). Thus, the objective was to assess the effect of the inclusion of different levels of coffee husk in pearl millet silage on the chemical composition, fermentative characteristics and degradability in situ of silage. The experimental design used was completely randomized and the treatments consisted of the silage of the whole pearl millet plant with the inclusion of increasing levels of coffee husk: 0%, 7%, 14% and 21%, based on natural matter. After 60 days of fermentation, the silages were evaluated for chemical characteristics, fermentative, degradability in situ dry matter (DM) and neutral detergent fiber (NDF). The inclusion of coffee husk did not alter (P > 0.05) the contents of crude protein (11.94%), NDF (44.89%) and total digestible nutrients (65.09%). There were increases in the concentrations of DM and fiber in acid detergent, accompanied by a reduction in the concentrations of mineral matter and ether extract, as the proportion of coffee husks in silages increased. There was an increase in the lignin content up to the level of 7.59% inclusion of the coffee husk. There was no effect of the inclusion of the coffee husk on the pH of the silage (3.60). However, the inclusion of coffee husk resulted in a reduction in temperature, gas losses, and degradability in situ of silage DM and NDF. It is recommended to include coffee husk up to the level of 14.0% of the natural matter to improve the fermentation pattern and the quality of the pearl millet silage. ABSTRACT Coffea sp. sp Pennisetumglaucum. Pennisetumglaucum . (Pennisetumglaucum) Thus composition 0 0% 7 7% 14 21 21% 6 (DM (NDF) P 0.05 005 05 11.94%, 1194 11.94% , 11 94 (11.94%) 44.89% 4489 44 89 (44.89% 65.09%. 6509 65.09% 65 09 (65.09%) extract increased 759 59 7.59 3.60. 360 3.60 3 (3.60) However temperature losses 140 14.0 (Pennisetumglaucum 1 2 (NDF 0.0 00 119 11.94 9 (11.94% 44.89 448 4 8 (44.89 650 65.09 (65.09% 75 5 7.5 36 3.6 (3.60 14. 0. 11.9 (11.94 44.8 (44.8 65.0 (65.09 7. 3. (3.6 11. (11.9 44. (44. 65. (65.0 (3. (11. (44 (65. (3 (11 (4 (65 ( (1 (6

ABSTRACT. The aim of this study was to examine the effect of longer cutting intervals on morphogenetic and structural traits, herbage production, nutritional value, and in vitro digestibility of Guinea grass cv. Mombaça (Mombaça grass). Four cutting intervals (49, 63, 77, and 91 days) were evaluated in two crop years (2015-2016 and 2016-2017) during the rainy season, in two replicates. Cutting intervals influenced structural and morphogenetic traits, except for number of live leaves (4.35 leaves tiller-1) and final leaf length (72.94 cm) in the 2015-2016 crop year. As the cutting intervals increased, dry matter yield and stem percentage increased, whereas leaf percentage and leaf-to-stem ratio declined. Regardless of the evaluated crop year, the dry matter, acid detergent fiber, and lignin contents increased linearly; however, the neutral detergent fiber content was unaffected. Cutting intervals affected the crude protein content and in vitro digestibility. Considering leaf appearance rate, stem appearance rate, and leaf-to-stem ratio, the recommended harvest age for Mombaça grass for optimum yield and nutritional value is 77 days. ABSTRACT traits production cv grass. . grass) 49, 49 (49 63 9 days 20152016 2015 2016 (2015-201 20162017 2017 2016-2017 season replicates 4.35 435 4 35 (4.3 tiller1 tiller 1 tiller-1 72.94 7294 72 94 (72.9 cm 2015-201 year leaftostem declined linearly however unaffected rate 7 (4 6 2015201 201 (2015-20 2016201 2016-201 4.3 43 3 (4. tiller- 72.9 729 (72. 2015-20 ( 201520 20 (2015-2 201620 2016-20 4. 72. (72 2015-2 20152 2 (2015- 20162 2016-2 (7 2015- (2015 2016- (201 (20 (2

Resumen El pasto Panicum maximum cv. BRS Tamani es una planta forrajera híbrida de alta calidad, de tamaño pequeño y con intensa actividad de macollaje. Este estudio se llevó a cabo para examinar el potencial del pasto Panicum maximum cv. BRS Tamani en diferentes edades de rebrote (49, 63, 77 y 91 días) para la producción de heno, en el período lluvioso. El experimento se realizó en la Escuela Agrícola de la Universidad Federal de Mato Grosso do Sul-Brasil, entre octubre de 2015 y abril de 2016. Los tratamientos correspondieron a cuatro edades de rebrote, con cuatro repeticiones, distribuidas en parcelas de 9 m2. Las edades de rebrote influyeron en las características morfogenéticas del pasto, excepto por la senescencia de la hoja y la longitud final de la hoja. Los rendimientos de materia verde (9.6-17.6 t ha-1) y seca (2.6-5.9 t ha-1), el rendimiento de heno (3.4-6.9 t ha-1) y las proporciones de tallo (91.6-455.9 g kg-1) y material senescente (34.8-98.4 g kg-1) aumentaron con las edades de rebrote, mientras que la proporción de hojas (837.7-402.1 g kg-1) y la relación hoja:tallo (15.9-0.9) disminuyeron (P<0.05). Los contenidos de materia seca (881.7-852.8 g kg-1) y de proteína (81.2-47.6 g kg-1) del heno disminuyeron con las mayores edades de rebrote; sin embargo, los contenidos de fibra detergente neutro (746.5-759.2 g kg-1), fibra detergente ácido (519.8-567.7 g kg-1) y lignina (74.3-86.4 g kg-1) aumentaron a medida que lo hicieron las edades de rebrote. La digestibilidad de los nutrientes disminuyó con las edades de rebrote (P<0.05). Panicum maximum cv. BRS Tamani tiene el potencial de producir heno ha-1, mejor valor nutritivo y una alta proporción de hojas en el intervalo de rebrote de 49 a 63 días.

Abstract The grass Panicum maximum cv. BRS Tamani is a hybrid high-quality, small-sized forage plant with intense tillering activity. This study was carried out to examine the potential of the grass Panicum maximum cv. BRS Tamani at different regrowth ages (49, 63, 77, and 91 d) for hay production, in the rainy period. The experiment was conducted at the Farm School of the Federal University of Mato Grosso do Sul-Brazil, between October 2015 and April 2016. The treatments corresponded to four regrowth ages, with four replicates, distributed into 9 m2 plots. Regrowth ages influenced the morphogenetic characteristics of the grass, except for leaf senescence and final leaf length. Green (9.6-17.6 t ha-1) and dry-matter (2.6-5.9 t ha-1) yields, hay yield (3.4-6.9 t ha-1), and proportions of stem (91.6-455.9 g kg-1) and senescent material (34.8-98.4 g kg-1) increased with the regrowth ages, while the proportion of leaves (837.7-402.1 g kg-1) and the leaf: stem ratio (15.9-0.9) decreased (P<0.05). The dry matter (881.7-852.8 g kg-1) and protein contents (81.2-47.6 g kg-1) of the hay decreased with the higher regrowth ages; however, the neutral detergent fibre (746.5-759.2 g kg-1) acid detergent fibre (519.8-567.7 g kg-1) and lignin (74.3-86.4 g kg-1) contents rose as the regrowth ages did. Nutrient digestibility decreased with the regrowth ages (P<0.05). Panicum maximum cv. BRS Tamani has the potential to produce of hay ha-1, better nutritive value and a high proportion of leaves in the regrowth interval of 49 to 63 d.

ABSTRACT The effects of diets containing oilseeds were measured to evaluate the productive and economic parameters in the finishing of young, feedlot Nellore bulls. Twenty-four young Nellore bulls were used, with an initial body weight (BW) of 311.46±0.37 kg and 24 months of age, distributed into individual stalls ( 4 × 20 m) in a completely randomized design, totaling four treatments with six repetitions per treatment. Four diets (control, based on corn and soybean meal, and three diets containing cottonseed, soybean, and sunflower) were evaluated. Feed and orts were measured daily to calculate intake and costs. The dry matter intake of the control group was higher than soybean (10.64 kg/day), cotton (9.88 kg/day), and sunflower (9.30 kg/day) treatments, respectively. The cottonseed treatment showed the highest average neutral detergent fiber intake. There was a dietary effect of diets on average daily gain, total weight gain, and final weight. The soybean treatment showed the highest performance, total gain (232.55 kg), and final weight (544.38 kg). Oilseed intake can modify the fatty acids profile in the meat, decreasing its saturated fatty acid content. Whole soybean seed favors performance, improves feed efficiency, fatty acid profile, and fat distribution in the carcass, and can reduce production costs. Twentyfour Twenty used BW (BW 31146037 311 46 0 37 311.46±0.3 2 age m design control, (control meal evaluated costs 10.64 1064 10 64 (10.6 kg/day, kgday kg/day , day 9.88 988 9 88 (9.8 9.30 930 30 (9.3 respectively performance 232.55 23255 232 55 (232.5 kg, kg) 544.38 54438 544 38 (544.3 kg. . meat content efficiency carcass 3114603 31 3 311.46±0. 10.6 106 1 6 (10. 9.8 98 8 (9. 9.3 93 232.5 2325 23 5 (232. 544.3 5443 54 (544. 311460 311.46±0 10. (10 9. (9 232. (232 544. (544 31146 311.46± (1 (23 (54 3114 311.46 (2 (5 311.4 311.

Abstract This study was carried out to evaluate the time for the establishment of tropical forage grasses in the “Cerrado” biome, based on morphogenetic and structural traits. Three Brachiaria brizantha (Syn. Urochloa brizantha) cultivars (Paiaguás, Ipyporã and Marandu) and two Panicum maximum (Syn. Megathyrsus maximus) cultivars (Quênia and Tamani) were distributed in a randomized-block design with four replicates. Morphogenetic and structural traits of the pasture were assessed from d 35 to d 65 after sowing, at seven-day interval. Canopy height rose linearly with the establishment period, in all cultivars. In the Megathyrsus cultivars, tiller density decreased as the experimental period progressed, whereas the number of tillers in the Urochloa cultivars increased. The cultivars Ipyporã and Marandu had the highest leaf appearance rates. The lowest leaf elongation rates occurred in the cultivars Paiaguás, Ipyporã and Tamani, and the highest elongation rates in cv. Quênia. As a result, cv. Quênia showed the highest values of final leaf length (64.9 cm) and leaf blade mass (3,352.9 kg DM ha-1). The higher senescence rate of cv. Tamani (2.1 cm tiller-1 d-1) resulted in the highest percentage of dead material (1,815.5 kg ha-1) being found in the herbage mass of this cultivar. Cultivars Paiaguás, Marandu and Tamani were established at 44 d, whereas cv. Quênia and Ipyporã were established at 51 and 58 d after sowing, respectively, in the Brazilian Cerrado.

Resumen Este estudio se llevó a cabo para evaluar el tiempo para el establecimiento de gramíneas forrajeras tropicales en el bioma del “Cerrado”, con base en rasgos morfogenéticos y estructurales. Se distribuyeron tres cultivares (Paiaguás, Ipyporã y Marandu) de Brachiaria brizantha (Sin. Urochloa brizantha) y dos cultivares (Quênia y Tamani) de Panicum maximum (Sin. Megathyrsus maximus) en un diseño de bloques al azar con cuatro repeticiones. Los rasgos morfogenéticos y estructurales del pasto se evaluaron desde el día 35 hasta el día 65 después de la siembra, a intervalos de siete días. La altura del dosel aumentó linealmente con el período de establecimiento, en todos los cultivares. En los cultivares de Megathyrsus, la densidad de macollos disminuyó a medida que avanzaba el período experimental, mientras que el número de macollos en los cultivares de Urochloa aumentó. Los cultivares Ipyporã y Marandu tuvieron las tasas más altas de aparición foliar. Las tasas de elongación foliar más bajas se presentaron en los cultivares Paiaguás, Ipyporã y Tamani, y las tasas de elongación más altas en el cv. Quênia. Como resultado, el cv. Quênia mostró los valores más altos de longitud foliar final (64.9 cm) y masa de lámina foliar (3,352.9 kg MS ha-1). La mayor tasa de senescencia del cv. Tamani (2.1 cm macollo-1 d-1) dio como resultado que el mayor porcentaje de material muerto (1,815.5 kg ha-1) se encontrara en la masa de forraje de este cultivar. Los cultivares Paiaguás, Marandu y Tamani se establecieron a los 44 d, mientras que los cv. Quênia e Ipyporã se establecieron a los 51 y 58 días después de la siembra, respectivamente, en el Cerrado brasileño.

ABSTRACT This study examined the effect of different supplementation strategies for ewes in the last third of gestation, kept on a deferred Brachiaria brizantha cv. Marandu pasture, on their performance and the growth curve of their lambs. A total of 54 ewes, of no defined breed, with an average weight of 41.10±3.10 kg, were used in a completely randomized design, divided into three groups (18 ewes per treatment). In total, 61 lambs were born, 28 females and 33 males, with 3.70±0.55 and 3.68±0.69 kg birth weight, respectively. Treatments were as follows: multiple mixture ad libitum, concentrate supplement at 0.4% live weight (LW), and concentrate supplement at 0.8% LW. Average daily weight gain (ADG, g/animal/day) and total weight gain (TWG, kg/animal) were evaluated in ewes and lambs. Reproductive efficiency indices were measured in the ewes and biometric variables in the lambs. The ADG and TWG of ewes in the last third of gestation were higher in animals supplemented at 0.8% LW. Reproductive efficiency results were superior in ewes supplemented at 0.4% LW. The effect of ewe supplementation on lamb growth curve as estimated by the Gompertz model did not reveal differences between the curves of lambs born to ewes that received supplementation at 0.4 and 0.8% LW. However, supplementing ewes with a multiple mixture induced a reduction in the growth curve parameters of their lambs. The use of concentrated supplementation, at levels of 0.4 and 0.8% of LW, provides greater productive and reproductive performance for ewes and lambs.

ABSTRACT The objective was to evaluate the inclusion of chitosan (CHI) and technical cashew nut shell liquid (CNSLt) as natural feed additives in cattle diets on nutrient digestibility, ruminal fermentation, and in vitro gas production kinetics. We conducted a completely randomized design with 5×4 factorial arrangement, with 20, 35, 50, 65, and 100% Tifton 85 hay and four additives, monensin (200 mg/kg DM), CNSLt (500 mg/kg DM), CHI (500 mg/kg DM), and CNSLt+CHI (500 mg/kg DM/each). Dry matter (DM) and organic matter (OM) digestibility showed a linear reduction according to forage levels. The highest DM digestibility was observed with CHI on cattle diets. Inclusion of CHI increased DM digestibility. The highest in vitro organic matter and crude protein (CP) digestibilities were observed for CNSLt+CHI. The in vitro dry matter digestibility increased linearly with concentrate in the diet. There was interaction of forage:concentrate ratio and the additives for neutral detergent fiber, acid detergent fiber and hemicellulose digestibility. Chitosan, CNSLt, and CNSLt+CHI promoted the lowest acetate:propionate ratio compared with monensin. Total gas production showed interaction of the forage:concentrate ratio and additives. Lag time was lowest with CNSLt+CHI. Chitosan and CNSLt can be considered alternative fermentation modulators to ionophores by improving nutrient digestibility and increasing ruminal propionate concentrations.

Abstract We hypothesize that lambs fed diets with different lipids sources from oilseeds would similar performance but fatty acids profile of meat superior to those fed with conventional diets. We evaluated the effects of inclusion of oilseeds on the ingestive behaviour, performance, carcass trait and meat quality in feedlot lambs. Three isonitrogenous (18.31% crude protein) diets were evaluated, where one diet was the standard (control), and the others two diets contained soybean and cottonseed. Fifteen Texel lambs, weighting 28.5 ± 1.65 kg were distributed in a completely randomized design by 56 days. Animals fed soybean diet demonstrated greater final body weight when compared to animals fed cottonseed diet and standard diet. The inclusion of cottonseed provided lower average daily gain and total weight gain. Ingestive behaviour of the animals fed diets with grains resulted in greater rumination time. Lambs fed cottonseed diet spent greater time during rumination and presented greater number of chews/day. The hot carcass and cold carcass weight presented lower values in animals fed cottonseeds diet. There was no significant difference in meat for marbling, maturity, fat texture and shear force. Meat from animals fed soybean diet had highest fat content. There was a diet effect for fatty acids composition in the meat. Meat of lambs treated with soybean have greater amounts for fatty acids mostly the unsaturated ones, related to the decrease in cholesterol levels, and lower risk of cardiovascular diseases, thus, lambs fed soybean enrich meat produced with fatty acids that benefit human health.

Abstract Our hypothesis was that different sources of unsaturated fatty acids from oilseeds (sunflower, soybeans, and cottonseed) could alter milk yield, fatty acid profile, and the amount of unsaturated fatty acids yielded in milk. It aimed to evaluate the effects of lipid sources on yield and composition and fatty acids in milk of primiparous Girolando cows. Five cows in lactation (35 ± 8 days), with 410 ± 7.15 kg BW were randomly distributed in a 5 x 5 Latin square. Five experimental diets, namely a control diet without an additional source of lipid and four diets with different lipid sources: cottonseed, sunflower seed, whole soybean, or soybean oil, as lipid source, to reach 70 g/kg of ethereal extract dry matter basis were used. Cottonseed and soybean oil addition reduced daily yield by 15 and 22%. Oilseed can alter fatty acid profile in milk. Whole soybean provided greater daily milk and fatty acids yields.

Abstract This research article describes the effect of different concentrations of iodine in the teat-dipping before milking and post-dipping solution on milk, urine, thyroid hormone, chemical composition and somatic cell count. Four multiparous cows were distributed in a 4 x 4 Latin square experimental design in a tie-stall system. The treatments were 0.5%, 1%, and 2% iodine and the control was treated with chlorhexidine. The iodine concentration of milk, food and urine was quantified. Thyroid hormones were analyzed by chemiluminescence microparticle immunoassay. Milk composition by differential absorption of infrared waves and somatic cell countby (SCC) flow cytometry. There was no significant effect of iodine concentrations in teats soaking solution before milking on urine iodine concentration and thyroid hormones (T3 and T4). Likewise, no effect of treatments was observed for the contents of protein, fat, lactose, total solids, Milk urea nitrogen and SCC. However, increasing iodine concentrations in the teat soaking solution before milking linearly increased the iodine concentration in milk. Therefore, the iodine concentration in the pre-milking and post-dipping solutions can change the iodine concentration in the milk.

RESUMO: Objetivou-se avaliar os modelos matemáticos Gompertz, Groot, monomolecular, Richards e logístico bicompartimental para estudar a cinética de produção de gás in vitro de dietas compostas de combinações de feno ou silagem de Gliricídia. Além disso, avaliou-se os efeitos da inclusão de feno ou silagem de Gliricídia sobre a produção cumulativa de gás in vitro destas dietas. A cinética de fermentação ruminal foi avaliada pela metodologia de produção cumulativa de gás in vitro. Os parâmetros dos modelos foram estimados usando o método de Gauss Newton, com exceção do modelo de Richards, que foi usado algoritmo de Marquardt. O ajuste dos modelos foi avaliado por meio do coeficiente de determinação, teste F para a identidade dos parâmetros, coeficiente de correlação e concordância, raiz quadrada do quadrado médio do erro da predição e a decomposição do quadrado médio do erro da predição em erro médio, vício sistemático e erro aleatório. Os modelos foram comparados quanto à acurácia (quadrado médio da predição pareado) e quanto à sua precisão (critério de informação delta de Akaike). Todas as estatísticas de avaliação e comparação dos modelos foram calculadas usando o software Model Evaluation System versão 3.2.2. Os modelos de Groot e Richards não diferiram entre si (P>0.05) e foram os mais precisos e acurados (P<0.05). Portanto, modelo de Groot foi selecionado devido apresentar melhor acurácia e precisão e apresentar maior facilidade na obtenção dos parâmetros. A inclusão da silagem de Gliricídia na dieta, resultou em elevação no tempo para obtenção da máxima taxa de degradação e no tempo após a incubação em que metade do nível assintótico foi atingido. Recomenda-se a utilização do modelo de Groot para estimativa da curva média. A inclusão da silagem de Gliricídia altera a curva de produção de gás devido o maior tempo necessário para que a dieta atingisse a máxima taxa de degradação, isso pode elevar o tempo de permanência da dieta no rúmen e promover redução no consumo.

ABSTRACT: This study examined the use of the Gompertz, Groot, monomolecular, Richards and two-compartment-logistic mathematical models to investigate the kinetics of in vitro gas production of diets composed of combinations of Gliricidia hay or silage. In addition, the effects of Gliricidia hay or silage inclusion on the in vitro cumulative gas production of these diets were evaluated. Rumen fermentation kinetics were analyzed by the in vitro cumulative gas production methodology. The model parameters were estimated using the Gauss Newton method, with the exception of the Richards model, which was used by Marquardt’s algorithm. Model fit was assessed using the determination coefficient, F test for parameters identity, concordance correlation coefficient, root mean square error of prediction, and decomposition of mean square error of prediction into mean error, systematic bias and random error. The models were compared for accuracy (pairwise mean square error of prediction) and precision (delta Akaike’s information criterion). All model evaluation and comparison statistics were calculated using Model Evaluation System software version 3.2.2. The Groot and Richards models did not differ from each other (P>0.05) and were the most precise and accurate (P<0.05). Therefore, the Groot model was selected due to its better accuracy and precision and easier access to the parameters. The inclusion of Gliricidia silage in the diet resulted in an increase in the time to obtain the maximum rate of degradation and in the time after incubation when half of the asymptotic level was reached. The Groot model is recommended to estimate the average curve. Dietary inclusion of Gliricidia silage alters the gas production curve due to the longer time required for the diet to reach the maximum rate of degradation, this can increase the time the diet remains in rumen and promote a reduction in the consumption.

RESUMO. Os coprodutos da agroindústria constituem uma alternativa para a utilização na nutrição animal. Foram realizados ensaios com oito tipos de coprodutos e alimentos para avaliar a composição bromatológica, a digestibilidade in vitro da matéria seca, a proteína bruta e a fibra em detergente neutro, bem como a produção de gases gerados por eles. Os coprodutos utilizados neste estudo foram: casca de café; polpa cítrica peletizada; resíduo de uva; casca de grão de soja; caroço de algodão; rama de mandioca e alimentos tradicionalmente empregados na alimentação de ruminantes: silagem de milho e concentrado de grão de milho moído. Os dados de digestibilidade in vitro da matéria seca, da proteína bruta e da fibra em detergente neutro foram interpretados por uma análise de variância, utilizando o método de quadrados mínimos; os resultados da produção de gás foram interpretados por uma regressão não linear pelo método de Gauss-Newton; e os efeitos de tratamentos foram avaliados por teste de médias (Teste de Tukey). Os coeficientes da digestibilidade in vitro da matéria seca, da proteína bruta e da fibra em detergente neutro dos alimentos analisados foram distintos. A produção de gases também foi distinta para os coprodutos e alimentos avaliados em relação ao volume de gás produzido nas frações de degradação rápida e lenta, taxa de degradação e para o tempo de colonização das bactérias e para o volume de gás total produzido. Os coprodutos avaliados apresentaram maior digestibilidade in vitro da matéria seca em relação à silagem de milho, com exceção do caroço de algodão, do resíduo de uva e da rama de mandioca. Além disso, os coprodutos apresentaram maiores valores de digestibilidade in vitro da proteína bruta em relação à silagem de milho, e redução da digestibilidade in vitro da fibra em detergente neutro, exceto para a polpa cítrica peletizada e a casca de grão de soja. A silagem de milho apresentou o maior volume de gás produzido na fração de degradação rápida comparada aos coprodutos e ao concentrado de milho. Os coprodutos analisados apresentaram características nutricionais adequadas pelas técnicas utilizadas e podem ser adicionados à dieta de ruminantes.

ABSTRACT. Agroindustrial co-products are a viable alternative for use in animal nutrition. Tests were conducted using eight different types of co-products and feed to evaluate the chemical composition, in vitro digestibility of dry matter, crude protein and neutral detergent fiber, and gas production by them. The co-products tested were: coffee hulls; pelleted citrus pulp; grape residue; soybean hulls; cottonseed; cassava foliage; and foods usually supplied to ruminants: corn silage and ground corn concentrate. Data of in vitro digestibility of dry matter, crude protein and neutral detergent fiber were tested by analysis of variance using the least square method; the results of gas production were interpreted by a non-linear regression by the Gauss-Newton method; and the effects of treatments were evaluated by the Tukey’s test. The coefficients of in vitro digestibility of dry matter, crude protein and neutral detergent fiber of co-products were different. Gas production was also different between co-products and feeds evaluated for the volume of gas produced from the fast and slow degradation fractions, degradation rate, bacterial colonization time, and the total volume of gas produced. The evaluated co-products exhibited greater in vitro dry matter digestibility compared to corn silage, except for cottonseed, grape residue, and cassava foliage. Co-products showed higher values of in vitro crude protein digestibility compared to corn silage, and a reduced in vitro digestibility of neutral detergent fiber, except for pelleted citrus pulp and soybean hulls. Corn silage produced larger volume of gas from the fast degradation fraction compared to the co-products and corn concentrate. Co-products analyzed had appropriate nutritional characteristics according to the techniques applied and can be included in ruminant diets.

ABSTRACT The addition of levels of ethanol extract of brown propolis was evaluated by assessing diet degradation in rumen fluid and predicting cumulative in vitro gas production by nonlinear (dual pool logistic and exponential) models. A total of 35 g of crude propolis were extracted in 65 mL of cereal alcohol (95% ethanol). In a completely randomized factorial design, the experimental diets combined four concentrations of extracted propolis diluted in cereal alcohol (0, 50, 70, and 100% of propolis extract) and supplementation doses (4, 8, 12, 16, and 20 mL/kg dry matter), tested in triplicate. Diet (400 g/kg Tifton hay and 600 g/kg concentrate) was incubated for 96 h carried out three times in three different weeks. There was significant interaction between extract concentration and dose on the dry matter (DM) degradability. Dry matter degradability of diet decreased exponentially as a function of the increase in dose (y = 678.55×dose–0.271). Pure alcohol treatment showed a negative exponential effect, with degradability of 303.61 g/kg when administered at a dose of 20 mL/kg DM. Treatment 100% ethanol extract reached the greatest degradability, estimated at 18.93 mL/kg DM. The treatment with 70% extract showed 6.35 mL/kg DM and the 50% extract, 7.65 mL/kg DM of minimum degradability. The reduction potential of pure ethanol was –0.32 mL gas/mL. Estimates of maximum gas production by dual pool logistic and exponential models were 13.10 mL and 12.07 mL for 100% extract, respectively. The 100% extract produced the highest gas production estimates, above 30 mL gas/100 mg DM of fermented diet. The degradation and fermentation of ruminant diet can be improved using 13 mL/DM kg of ethanol extract of propolis.

Resumo: Tradicionalmente, a contabilidade faz o rateio dos custos indiretos na atividade pecuária bovina de ciclo completo com base no custo unitário por animal (cabeça). Por esse critério, o valor de custo atribuído a um bezerro é o mesmo para um animal adulto (vaca), o que sugere não ser o critério mais adequado. O uso de insumos agropecuários, o consumo de alimentos e a compra e venda de animais ocorrem em função do peso corporal. Desenvolver um critério de rateio que permite distribuir os custos de produção ao rebanho levando em conta o peso corporal seria o mais adequado. Propor o rateio dos custos indiretos da atividade da pecuária bovina de ciclo completo com base na Unidade Animal (U.A.) é o objetivo deste trabalho, uma vez que ela permite classificar bovinos de diversas idades e sexo em uma mesma base de avaliação. Os resultados confirmaram diferenças entre os critérios de rateio, apontando que o em U.A., é o mais adequado para rateio dos custos na pecuária bovina de ciclo completo.

Abstract: Traditionally, accounting makes the apportionment of indirect costs in the full cycle beef cattle activity based on the unit cost per animal (head). By this criterion, the cost value attributed to a calf is the same for an adult animal (cow), which suggests not be most appropriate criterion. The use of agricultural inputs, food consumption and the purchase and sale of animals occur according to body weight. Provide an apportionment criterion that allows distribution of the production costs to the herd taking into account the body weight would be the most appropriate. Proposing the apportionment of the overhead costs of the full cycle beef cattle activity based on the animal unit (AU) is the objective of this study, since it allows classifying beef cattle of different ages and sex in the same evaluation basis. The results confirmed differences among the apportionment criteria, pointing out that the animal unit is the most appropriate for apportioning costs in full cycle beef cattle