Effect of fiber digestibility and conservation method on feed intake and ruminal e...
| Full text | |
| 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.
Total Authors: 9
|
| 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 type: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 10/02036-4 - Molecular characterization of rumen bacteria in steers fed different roughage:concentrate diet |
| Grantee: | Carlos Stefenson Ribeiro Junior |
| Support type: | Scholarships in Brazil - Master |
| 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 type: | Scholarships in Brazil - Post-Doctorate |