Effect of crude glycerine in supplement on the intake, rumen fermentation, and microbial profile of Nellore steers grazing tropical grass

Autor(es)

San Vito, Elias ; Messana, Juliana D. ; Castagnino, Pablo S. ; Granja-Salcedo, Yury T. ; Dallantonia, Erick E. ; Berchielli, Telma T.

• Tipo de documento: Artigo Científico
• Fonte: LIVESTOCK SCIENCE; v. 192, p. 17-24, OCT 2016.
• Citações Web of Science: 4

Resumo

The objective of this study was to evaluate the effect of crude glycerine (CG) inclusion in feed supplement (0, 70, 140, 210 and 280 g/kg DM basis of supplement) on the forage intake and digestibility, ruminal fermentation parameters, kinetics of fibre degradation, and rumen microbial profile of Nellore steers grazing on tropical grass. Ten ruminally cannulated Nellore steers {[}490 kg +/- 47 body weight (BW)] were used in a replicated 5 x 5 Latin square design with 14-d periods. Steers were individually supplemented at the rate of 300 gf100 kg of BW. Inclusion of CG in the supplement did not affect (P > 0.05) dry matter intake, apparent total tract digestibility, ruminal pH (P=0.784) or total rtiminal VFA (P=0.291), but linearly decreased the NH3-N concentration (P=0.021). The inclusion of CG in the supplement linearly increased (P < 0.001) the molar proportions of butyrate and valerate; linearly decreased the acetate (P=0.007) concentration, thus reducing the acetate to propionate ratio (P < 0.001); and did not affect the molar proportions of propionate and isobutyrate. Inclusion of GC had a quadratic effect (P=0.010) on the in situ potential degradable fraction of NDF and rate of fibre degradation (P=0.006). Addition of CG linearly decreased the number of protozoa of the genera Entodinium (P=0.015) and Isotricha (P=0.058) and the relative proportions of Ruminococcus albus (P=0.047) and Ruminococcus flavefaciens in the rumen (P=0.036), but did not affect Fibrobacter succinogenes (P=0.420) or the methanogens (P=0.150). The inclusion of CG in the supplement up to 280 g/kg DM altered ruminal fermentation and negatively affected in situ fibre degradation and the gram-positive cellulolytic bacterial population, but did not affect intake and apparent total tract digestibility for Nellore steers grazing tropical grass. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/06409-2 - Glicerina bruta oriunda da agroindústria do biodiesel na suplementação de novilhos de corte criados a pasto
• Beneficiário: Elias San Vito
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/00060-8 - Balanço de gases de efeito estufa e estratégias de mitigação em pastos de Brachiaria submetidos a diferentes manejos
• Beneficiário: Telma Teresinha Berchielli
• Modalidade de apoio: Auxílio à Pesquisa - Temático