Determining the optimal dose of virginiamycin for ruminal parameters and performance of Nellore cattle on pasture / Determinação da melhor dose resposta de virginiamicina nos parâmetros ruminais e desempenho de bovinos Nelore a pasto
Alves Neto, João Alexandrino; Oliveira, Ivanna Moraes de; Moretti, Matheus Henrique; Gonçalves, Paloma Helena; Alves, Michele Aparecida Prado; Fernandes, Juliano José de Resende; Resende, Flávio Dutra de; Siqueira, Gustavo Rezende.
Semina ciênc. agrar
; 39(4): 1749-1758, 2018. tab
Artículo
en Inglés
| VETINDEX | ID: biblio-1501186
There are no studies evaluating the virginiamycin (VM) doses under tropical conditions. So, the present study was conducted to evaluate the optimal dose of VM for growing Nellore bulls on tropical pasture. Two experiments were conducted. The first experiment, one hundred and two Nellore bulls (307 ± 25 kg body weight [BW]; 22 months) were used. Animal performance was evaluated using a randomized block design, with group as experimental unit (n = 8; 12 animals each). The second experiment, a double 4 × 4 Latin square, eight animals were used to evaluate the ruminal parameters. Four doses were evaluated 0, 35, 55, and 75 mg VM per 100 kg BW. The average daily gain (P = 0.08) and carcass gain (P = 0.05) exhibited a trend of quadratic behavior. An increased dose of VM did not affect supplement intake (P = 0.64), rumen pH (P = 0.96), acetate propionate ratio (P = 0.73), or the total concentration of volatile fatty acid (P = 0.63). The concentration of rumen ammonia nitrogen exhibited a quadratic effect (P = 0.01). A quadratic behavior was found for volatile fatty acid, except for propionate, which presented linear behavior (P = 0.03). In conclusion, the dose of 47 mg VM per 100 kg BW is recommend for growing Nellore bulls on tropical pasture.
Biblioteca responsable:
BR68.1
Ubicación: BR68.1
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