ABSTRACT Several studies on the kinetics of sugarcane’s fiber digestion have been published, but, to date, no study has evaluated the influence of sugarcane rind on the digestion of fresh sugarcane by ruminants. This study aimed to evaluate the effects of sugarcane components (rind and pith) on chemical composition, in vitro digestibility, metabolizable energy, and sugarcane quality. A randomized block design was used in a split-plot scheme with five sugarcane genotypes [plot] (RB068027, RB058046, RB987917, RB867515, and RB855536) and three sugarcane components [sub-plot] (rind, pith, and whole cane), Each treatment consisted of four replicates. The chemical composition, in vitro gas production, in vitro digestibility, metabolizable energy, and sugarcane quality were evaluated. No interaction between components and genotypes was observed for the variables analyzed herein. Although the rind had a higher crude protein content, it showed a large amount of insoluble crude protein. The rind had higher fibrous fractions, comprising 87.33 % of the indigestible fraction of the neutral detergent fiber (NDF). The sugarcane rind showed ~ 71.20 % more lignin than the pith tissue. Further, the rind decreased by 6.5 % in vitro dry matter digestibility compared to the whole sugarcane. The in vitro NDF digestibility of the rind was 18.38 % lower than the whole sugarcane. The RB068027 genotype showed the lowest sugarcane quality. Despite the higher content of potentially digestible neutral detergent fiber (pdNDF) in the rind, its high lignin content influences the quality of the final fibrous fractions of sugarcane and negatively impacts the nutritional value. The genotypes do not differ nutritionally, but RB855536 presented higher biomass and energy yields. sugarcanes s published date ruminants composition splitplot split plot [plot RB068027, RB (RB068027 RB058046 RB987917 RB867515 subplot sub [sub-plot cane, cane , cane) replicates production herein 8733 87 33 87.3 NDF. . (NDF) 7120 71 20 71.2 tissue Further 65 6 5 6. 1838 18 38 18.3 RB06802 pdNDF (pdNDF value nutritionally RB85553 yields (RB06802 RB05804 RB98791 RB86751 873 8 3 87. (NDF 712 7 2 71. 183 1 18. RB0680 RB8555 (RB0680 RB0580 RB9879 RB8675 RB068 RB855 (RB068 RB058 RB987 RB867 RB06 RB85 (RB06 RB05 RB98 RB86 RB0 RB8 (RB0 RB9 (RB

ABSTRACT Corn silage is susceptible to losses through aerobic spoilage. Therefore, this study aimed to evaluate increasing sweet orange essential oil levels in chemical composition, in vitro degradability, losses, fermentation parameters, microbial count, and the aerobic stability of corn silage. The experiment was carried out in a completely randomized design with four treatment levels: Control (CON), ensiling corn without sweet orange essential oil; 200 mg kg–1,400 mg kg–1, and 600 mg kg–1 of ensiling mass with four replicates per treatment. Sweet orange essential oil affected both the dry matter (p = 0.035) and the organic matter (p = 0.021), presenting quadratic behavior. Sweet orange essential oil did not affect (p ≥ 0.05) in vitro dry matter degradability, in vitro neutral detergent fiber degradability, or gross energy. Sweet orange essential oil had a quadratic effect (p = 0.022) on the acetic acid concentration in corn silage. There was a tendency (p = 0.097) for sweet orange essential oil to reduce the ammoniacal nitrogen linearly. The levels of sweet orange essential oil did not influence losses by gases or effluents (p ≥ 0.05). We observed no effect of sweet orange essential oil on Lactic acid-producing bacteria populations or fungi (p ≥ 0.05). Furthermore, increasing sweet orange essential oil levels decreased temperature (p = 0.02) over time but did not influence pH (p = 0.404). Sweet orange essential oil does not affect in vitro degradability, fermentation parameters, nor microbial count in corn silage. However, the 600 mg of ensiling mass increases corn silage’s acetic acid concentration and aerobic stability. spoilage Therefore composition degradability parameters CON, CON , (CON) 20 kg1400 kg 1 400 kg–1,40 kg1 60 kg– p 0.035 0035 0 035 0.021, 0021 0.021 021 0.021) behavior 0.05 005 05 energy 0.022 0022 022 0.097 0097 097 linearly 0.05. . acidproducing producing Furthermore 0.02 002 02 0.404. 0404 0.404 404 0.404) However silages s (CON 2 kg140 40 kg–1,4 6 0.03 003 03 0.0 00 0.09 009 09 040 0.40 kg14 4 0. 04 0.4

RESUMO Estratégias que objetivam condicionar o solo impactam positivamente no sistema de produção de ruminantes a pasto. A produção de serapilheira é diretamente responsável por melhorias nas características químicas, físicas e biológicas no solo. Objetivou-se neste estudo quantificar e qualificar a deposição de serapilheira do Sistema Silvipastoril com Eucalipto (SSP), a fim de compará-lo com Floresta Estacional Semidecidual (FL) e Sistema de Pastagem em Monocultivo (MN), assim como a decomposição do material decíduo. Para isso, foram instalados 12 coletores de serapilheira em cada ecossistema, onde foi mensurado e estratificado a deposição do material decíduo a cada 28 dias, por 11 meses. A decomposição da serapilheira foi avaliada através do método de litterbags. A produção total de serapilheira dos meses avaliados para SSP, FL e MN foi de 10,74, 7,17 e 1,01 t ha-1, respectivamente. A constante de decomposição (k) para SSP e FL foi de 0,0021 e 0,0025 g g-1 dia-1, enquanto o tempo de meia vida (T0,5) foi de 322 e 272 dias, respectivamente. A arborização das pastagens com eucalipto tem potencial de aumentar a produção de matéria orgânica no sistema e beneficiar os demais componentes do SSP. pasto químicas Objetivouse Objetivou se , (SSP) comparálo compará lo (FL MN, (MN) isso 1 ecossistema 2 dias litterbags 1074 10 74 10,74 717 7 17 7,1 101 01 1,0 ha1, ha1 ha 1, ha-1 respectivamente k (k 00021 0 0021 0,002 00025 0025 g1 g- dia1, dia1 dia dia-1 T0,5 T05 T T0 5 (T0,5 32 27 (SSP (MN 107 10,7 71 7, ha- 0002 002 0,00 dia- T0, (T0, 3 10, 000 00 0,0 (T0 0, (T

ABSTRACT Strategies that aim to condition the soil positively impact ruminant production systems on pasture. The production of litterfall is directly responsible for improvements in the soil's chemical, physical, and biological characteristics. The objective of this study was to quantify and qualify the litterfall deposition of the Silvopastoral System with Eucalyptus (SSP) to compare with Semideciduous Seasonal Forest (FL) and Monoculture Pasture System (MN), as well as the decomposition of deciduous material. For this, 12 litterfall collectors were placed in each ecosystem, where the deposition of deciduous material was measured and stratified every 28 days for 11 months. Litterfall decomposition was evaluated using the litterbags method. The total litterfall production over the evaluated months for SSP, FL, and MN were 10.74, 7.17, and 1.01 t ha-1, respectively. The decomposition constant (k) for SSP and FL were 0.0021 and 0.0025 g g-1 day-1, while the half-life time (T0.5) was 322 and 272 days, respectively. The afforestation of pastures with eucalyptus can potentially increase organic matter production in the system and benefit the other components of SSP. pasture soils s chemical physical characteristics (SSP (FL MN, , (MN) 1 ecosystem 2 method 1074 10 74 10.74 717 7 17 7.17 101 01 1.0 ha1, ha1 ha 1, ha-1 respectively k (k 00021 0 0021 0.002 00025 0025 g1 g- day1, day1 day day-1 halflife half life T0.5 T05 T T0 5 (T0.5 32 27 (MN 107 10.7 71 7.1 1. ha- 0002 002 0.00 day- T0. (T0. 3 10. 7. 000 00 0.0 (T0 0. (T