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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effect of sugarcane genotype and maturity stage at harvest on feed intake and ruminal parameters of growing steers

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Autor(es):
Sousa, D. O. [1, 2] ; Velasquez, A. V. [2] ; Oliveira, C. A. [2] ; Souza, J. M. [2] ; Nadeau, E. [1, 3] ; Silva, L. F. P. [2, 4]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Swedish Univ Agr Sci, Fac Vet Med & Anim Sci, Dept Anim Environm & Hlth, Box 234, S-53223 Skara - Sweden
[2] Univ Sao Paulo, Sch Vet Med, Dept Anim Sci, BR-13635900 Pirassununga - Brazil
[3] Rural Econ & Agr Soc Sjuharad, S-51405 Radde Gard, Langhem - Sweden
[4] Univ Queensland, QAAFI, St Lucia, Qld - Australia
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: ANIMAL FEED SCIENCE AND TECHNOLOGY; v. 256, SEP 2019.
Citações Web of Science: 0
Resumo

This experiment was conducted to evaluate the effect of altering fibre digestibility by genotype and maturity stage of sugarcane silage on intake, ruminal fermentation, ruminal kinetics, and rumen bacteria populations. Two genotypes with high or low NDF digestibility (NDFD) harvested for silage at early or late maturity were used in a 2 x 2 factorial arrangement of treatments: two genotypes and two maturity stages. Eight ruminally cannulated Nellore steers were used in a duplicated 4 x 4 Latin square design. Experimental diets were formulated with 40% sugarcane silage on DM basis. The DMI was greater when the animals were fed early-maturity sugarcane silage, but only with low-NDFD genotype. Intake of aNDFom was greater for early-maturity sugarcane diets than late-maturity sugarcane diets. Rumen pool of DM, aNDFom and iNDF were greater when diets with the low-NDFD genotype were fed. Turnover of aNDFom and daNDFom (digestible aNDFom), and aNDFom passage rate were greater when animals were fed high-NDFD sugarcane silage. Passage rate of aNDFom was greater when early-maturity sugarcane silage was provided. Ruminal pH was greater when early-maturity silages were fed, but only with high-NDFD genotype. Total SCFA concentration in the rumen was greater when early-maturity silages were fed, but only with low-NDFD genotype. Proportion of propionate was greater in the rumen of animals fed high-NDFD sugarcane genotype compared to animals fed low-NDFD sugarcane genotype. Megasphaera elsdenii population was greater when diets with late-maturity sugarcane silages were fed. There was a tendency for greater relative populations of Fibrobacter succinogenes and Ruminococcus albus when animals were fed low-NDFD sugarcane silage. In conclusion, feeding growing steers with high-NDFD sugarcane silage can positively affect rumen pool through faster passage rate and turnover of fibre that might benefit intake when metabolic pathways are not driving satiety. (AU)

Processo FAPESP: 13/15751-1 - Efeito da alteração da digestibilidade da fibra pela época de corte e pelo genótipo sobre o desempenho, consumo, cinética e ecossistema ruminal de novilhos alimentados com silagem de cana-de-açúcar
Beneficiário:Dannylo Oliveira de Sousa
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 14/12101-9 - Mecanismo molecular de lignificação em gramíneas tropicais e efeito da alteração da lignificação da fibra sobre o desempenho animal
Beneficiário:Luis Felipe Prada e Silva
Linha de fomento: Auxílio à Pesquisa - Regular