Parameters of fermentation and rumen microbiota of Nellore steers fed with different proportions of concentrate in fresh sugarcane containing diets

Author(s)

Ribeiro Junior, Carlos S. ; Messana, Juliana D. ; Granja-Salcedo, Yury T. ; Canesin, Roberta C. ; Fiorentini, Giovani ; San Vito, Elias ; Furlan, Luiz R. ; Reis, Ricardo A. ; Berchielli, Telma T.

• Document type: Journal article
• Source: ARCHIVES OF ANIMAL NUTRITION; v. 70, n. 5, p. 402-415, 2016.
• Web of Science Citations: 3

Abstract

The objective of this study was to evaluate the effect of a fresh sugarcane-based diet and different roughage-to-concentrate ratios (70: 30, 60: 40, 40: 60 and 20: 80) on the rumen microbiota associated with rumen fermentation parameters and the intake and apparent digestibility of nutrients in Nellore steers. Eight rumen-cannulated Nellore steers (331 +/- 8 kg BW) were distributed in a double 4 x 4 Latin square design balanced for the control of the residual effect. The ruminal pH decreased (p < 0.01) and the concentrations of N-NH3, isovaleric and valeric acids increased linearly (p < 0.05) with an increase dietary concentrate level. Furthermore, an increased concentrate proportion reduced the population of Fibrobacter succinogenes and Ruminococus flavefaciens (p < 0.01) and increased the population of Selenomonas ruminantium and Megasphaera elsdenii (p < 0.01). The protozoa count revealed a predominance of the genus Entodinium. The synthesis of microbial N {[}g/d] and the efficiency of microbial synthesis {[}g of microbial N/kg of organic matter apparently digested in the rumen] increased as the proportion of concentrate was increased (p < 0.05). Therefore, it can be concluded that an increasing proportion of concentrate in sugarcane-containing diets enhances the synthesis of microbial protein and does not alter the fibre digestibility, although the population of fibre fermenting bacteria was reduced. (AU)

• FAPESP's process: 11/20617-7 - Identification and quantification of ruminal bacteria in steers fed with different relations forage: concentrate
• Grantee: Carlos Stefenson Ribeiro Junior
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 14/09033-1 - Meta-analysis of the effects of diets with lipid, glycerin and association of both in on rumen fermentation and feed efficiency in beef cattle on pasture or feedlot
• Grantee: Juliana Duarte Messana
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 10/02036-4 - Molecular characterization of rumen bacteria in steers fed different roughage:concentrate diet.
• Grantee: Carlos Stefenson Ribeiro Junior
• Support Opportunities: Scholarships in Brazil - Master