Casca de soja como substituto do milho moído pode aumentar a digestibilidade da fibra e o perfil fibrolítico bacteriano de novilhos Nelore em pastejo durante a estação chuvosa
DOI:
https://doi.org/10.5433/1679-0359.2019v40n6Supl3p3577Palavras-chave:
Digestibilidade, Protozoários, Bactérias ruminais, Pastagem tropical, Grão de soja inteiro.Resumo
Este estudo avaliou o efeito da substituição do milho moído por casca de soja associado ou não a grãos de soja no suplemento de novilhos Nelore em crescimento pastejando Brachiaria brizantha cv. Xaraés durante a estação chuvosa sobre o consumo, digestibilidade de nutrientes, população microbiana ruminal, e parâmetros de fermentação de novilhos Nelore (425 ± 36 kg de peso corporal (PC)) em crescimento pastejando Brachiaria brizantha cv. Xaraés durante a estação chuvosa. Foram utilizados oito novilhos Nelore com cânulas no rúmen e duodeno distribuídos em um quadrado latino 4 × 4 replicado com arranjo fatorial 2 x 2, alocados em 4 piquetes de 0.25 ha cada, de Brachiaria brizantha cv. Xaraés e suplementados com: (1) milho moído associado a grão de soja inteiro (SG); (2) milho moído sem SG; (3) casca de soja (SH) associada a SG; e (4) SH sem SG. O consumo de suplemento não foi afetado pela SG ou SH (média de 2,12 kg-1 d, P > 0,05). Não houve interação entre o SG e SH no consumo de MS e nutrientes (P > 0,05). A adição de SG diminuiu o consumo de matéria seca (MS) expresso em % de PC e Kg-1 d, MS da forragem, matéria orgânica (MO), proteína bruta (PB), fibra em detergente neutro (FDN) e energia bruta (GE) (P?0.01). Animais suplementados com HS sem SG apresentaram maior digestibilidade da MS (74.52), MO (77.62), PB (77.51), FDN (71.93) e EB (72.90) do que animais suplementados com SH com SG (MS =69.01, MO = 71.92, PB = 72.81, FDN = 66.01, EB = 68.01) expresso em % (P ? 0.01). A adição de SG nos suplementos diminuiu o pH e NH3-N ruminal (P=0.02). Animais suplementados sem SH e sem SG mostraram grandes contagens de Entodinium (6.01 n x 104 ml-1, P=0.04), e a suplementação com SG reduziu os números de Dasytricha, Isotricha, e o total de protozoários ruminais (P < 0.01). A abundância de Ruminococcus albus, R. flavefaciens e Archaeas foi maior para SH sem suplementação com SG. Adicionalmente, animais suplementados com SG apresentaram menor número de Fibrobacter succinogenes. O uso de casca de soja sem grão de soja inteiro no suplemento pode ser eficaz para aumentar a digestibilidade da fibra, o N retido, e as populações de R. albus e R. flavefaciens no rúmen de novilhos Nelore pastejando Brachiaria brizantha cv. Xaraés durante a estação chuvosa.Métricas
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Referências
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Josê Neto, A., Granja-Salcedo, Y. T., Messana, J. D., Malheiros, E. B., Reis, R. A., Pires, A. V., & Berchielli, T. T. (2019). Casca de soja como substituto do milho moído pode aumentar a digestibilidade da fibra e o perfil fibrolítico bacteriano de novilhos Nelore em pastejo durante a estação chuvosa. Semina: Ciências Agrárias, 40(6Supl3), 3577–3594. https://doi.org/10.5433/1679-0359.2019v40n6Supl3p3577
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