A pesquisa foi conduzida para avaliar o desempenho, metabolizabilidade dos nutrientes e rendimento de carcaça e dos principais cortes comerciais de frangos de cortes alimentados com dietas contendo aditivos alternativos a antibióticos promotores de crescimento, no período de 22 a 42 dias. Os tratamentos foram constituídos de uma ração controle padrão para atender as exigências das aves em cada fase e os demais adicionados de antibiótico; probióticos, prebióticos e simbióticos, com quatro repetições. O uso de probiótico (Lactobacillus acidophilus, Streptococcus faecium e Bifidumbacterium bifidum), do prebiótico (mananoligossacarídeo - MOS) e simbióticos, em ração de frangos de corte, proporciona resultado semelhante ao uso do antibiótico avilamicina 12% para desempenho, rendimento de carcaça e cortes comerciais (peito, dorso, coxa, sobrecoxa, asas, entreasas), coeficiente de metabolizabilidade da matéria seca, da proteína bruta e da energia bruta, no período de 22 a 42 dias de idade, constituindo esses aditivos em alternativa importante na substituição dos antibióticos promotores de crescimento.

This research was conducted to evaluate the performance, metabolizability of nutrients and yield of carcass and the most commercial cuts of broiler chickens fed with diets containing antibiotic growth promoter, probiotics, prebiotic and symbiotics, in the period from 22 to 42 days of age. The experimental treatments were constituted of the basal diet to attempt the nutritional requirements of birds in each phase and others treatments were added of antibiotic; probiotics; prebiotic and symbiotics. The use of probiotic (Lactobacillus acidophilus, Streptococcus faecium and Bifidumbacterium bifidum), and prebiotic (mananoligossacarídeo-MOS) and symbiotics in ration of broiler chicken feed, produce performance, carcass yield and yield of most of the commercial cuts (breast, back, thigh, drumstick, wings and wing drumette), as well as metabolizability coefficient of dry matter, crude protein and gross energy, similar to that achieved with the use of the antibiotic Avilamycin 12%, during the period from 22 to 42 days of age. This way, these additives are important alternative in the substitution of antibiotics.

This research was developed to evaluate the nutritional, digestible (DE) and metabolizable (ME) energy values of dehydrated brewery residue (DBR) for growing pigs, as well as to evaluate the performance of these animals, subjected to five levels of DBR inclusion (0, 5, 10, 15 and 20%). The experimental design was of randomized blocks, based on animal weight. In the digestibility assay, 12 male piglets of average weight of 34.8±4.8 kg were utilized, while the performance assay had 40 piglets with average weight of 26.7±3.3 kg. Digestible and metabolizable protein values of dehydrated brewery residue for growing pigs reared in an environment of high temperatures were 22.47 and 22.06%, respectively, whereas digestible and metabolizable energy values of DBR were 3,371 and 3,364 kcal/kg, respectively. Dehydrated brewery residue can be included in diets for growing pigs up to the level of 20%.

The objective of this study was to analyze the effect of whole cassava root scrapings at different levels in diets for broilers in the period of 22 to 42 days of age in high-temperature environments on performance, as well as to evaluate the metabolizability of dry matter (DM), crude protein (CP) and gross energy (GE) and nitrogen balance. A total of 400 male Ross broilers were used for evaluation of performance and 80 birds of the same strain were used in the metabolism experiment. The design was of randomized block with five treatments and four replications. The experimental unit was represented by twenty birds on the performance evaluation and four birds were housed in metabolic cages for the metabolism evaluation. The treatments consisted of diets containing inclusion levels of cassava root scrapings (0, 50, 100, 150 and 200 g/kg), formulated to meet the nutritional requirements accordingly to each phase of the birds. Whole cassava root scrapings can be included in diets for 22 to 42 day-old broiler chickens, at a level between 118.75 and 200 k/kg, in environments of high temperatures, with positive interference on weight gain and feed conversion, without affecting the coefficient of metabolizability of dry matter, crude protein, gross energy and nitrogen balance, or carcass characteristics, such as yields of main cuts and metabolically active organs of the birds.

Esta pesquisa foi desenvolvida para avaliar o desempenho produtivo e a histomorfometria dos segmentos do intestino delgado em frangos de corte no período de 1 a 21 dias de idade alimentados com dietas contendo diferentes aditivos melhoradores de crescimento: ração controle (sem melhorador de crescimento); ração controle + antibióticos (colistina e bacitracina de zinco); ração controle + probiótico; ração controle + prebiótico; ração controle + probiótico + prebiótico. As aves foram distribuídas em delineamento em blocos casualizados, com cinco tratamentos e quatro repetições. Foram avaliadas as variáveis de desempenho, consumo de ração, ganho de peso e conversão alimentar e as características morfométricas, altura, perímetro e profundidade de vilos, dos segmentos do intestino delgado no período de 1 a 21 dias de idade. O desempenho das aves e as características morfométricas dos segmentos dos intestino não apresentaram diferença entre os grupos. O uso de probiótico, prebiótico, probiótico + prebiótico e antibiótico em rações para frangos de corte no período de 1 a 21 dias de idade em condições de baixo desafio sanitário não interfere no desempenho e nas características histomorfométricas dos segmentos do intestino delgado.

The objective of this work was to evaluate the performance and intestinal histomorphometry of small intestine segments in broiler chickens in 1 to 21-day of age period, fed diets with different growth promoter additives: control diet (without growth promoter); control diet + antibiotic (colistin and zinc bacitracin); control diet + probiotic (Protexin); control diet + prebiotic (Bio moss); control diet + probiotic + prebiotic. The birds were distributed in a random block design, with five treatments and four replications. It was evaluated variables of performance, feed intake, weight gain and feed conversion and the morphometric characteristics, height, circumference and depth of the villus of small intestine segments in 1 to 21-day of age period. Performance and morphometric traits of small intestine did not present differences among groups. The use of probiotic, prebiotic, probiotic + prebiotic and antibiotic in diets for broiler chickens in 1 to 21-day of age period, in conditions of low health challenge, does not interfere in the performance and in the histomorphometric characteristics of the segments of the small intestine.

A pesquisa foi desenvolvida com os objetivos de avaliar o desempenho e as características de carcaça de frangos de corte alimentados com dietas contendo diferentes níveis de polpa de caju desidratada e analisar a viabilidade econômica desse sistema de produção. Foram utilizados 320 frangos com 22 dias de idade, da linhagem Ross, de ambos os sexos, distribuídos em delineamento em blocos casualisados, com quatro tratamentos - níveis de inclusão (0, 5, 10 e 15%) de polpa de caju desidratada (PCD) - e cinco repetições com 16 aves. Aos 42 dias de idade, foram selecionadas, por peso e sexo, quatro aves (dois machos e duas fêmeas) por unidade experimental, as quais foram abatidas para avaliação do rendimento de carcaça e de seus cortes. A inclusão de até 15% de polpa de caju desidratada em rações para a fase de crescimento não influenciou o consumo, o ganho de peso e as principais características de carcaça dos frangos de corte. A conversão alimentar piorou e a viabilidade econômica (renda bruta e margem bruta média) foi menor com o incremento da polpa de caju desidratada nas rações. O uso de polpa de caju desidratada para frangos de corte depende do preço da polpa em relação ao preço do ingrediente convencional (milho) e do óleo vegetal utilizado na formulação da dieta.

This research was developed to evaluate the performance, carcass characteristic and economical viability of broilers fed diets with increasing levels of dehydrated cashew pulp. Three hundred and sixty Ross breed broilers of both sexes averaging 22 days old were allotted to randomized blocks design with four treatments, constituted of dehydrated cashew pulp levels (0, 5, 10, and 15%) and five replications. At 42 days old, four birds (two males and two females) were slaughtered by weight and sex per experimental unit to evaluate the main carcass characteristics. The 15% level of dehydrated cashew pulp in the growing diets did not affect feed intake, weight gain and main carcass characteristics of broiler. No effects of increasing levels on feed gain ratio and economical analyses (gross revenue and average gross margin) were noticed. The use of dehydrated cashew pulp in the broiler diets depends on the diet prices.