Does virginiamycin supplementation affect the metabolism and performance of Nellore bulls grazing under low and high gain rates?
Nenhuma Miniatura disponível
Data
2018-10-01
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Artigo
Direito de acesso
Acesso restrito
Resumo
This study aimed to evaluate the effect of virginiamycin on the metabolism and performance of growing Nellore bulls under low and high gain rates on pasture. In experiment 1, 80 Nellore bulls (age = 12 ± 2 months, body weight = 258 ± 15 kg) were assigned to 16 paddocks in a 2 × 2 randomized block factorial arrangement. In experiment 2, 12 cannulated Nellore bulls were assigned to three 4 × 4 balanced Latin squares. The factors were: (1) mineral salt without or with virginiamycin, and (2) low or high gain rate. No interaction was noted between factors (p >.10). Animals fed virginiamycin had greater average daily gain (14%, p <.01), body weight (11 kg, p =.05), plasma nonesterified fatty acid (20%, p <.01), serum calcium concentration (2.62%, p =.04), and total protozoa (p =.03) and had the same bacterial proportion (p >.27). Animals with a low gain rate had greater serum urea concentration (19.6%, p <.01) and ruminal ammonia nitrogen (62%, p <.01). Thus, virginiamycin increases the performance and changes the metabolism of growing Nellore bulls under low and high gain rates on pasture.
Descrição
Palavras-chave
Idioma
Inglês
Como citar
Animal Science Journal, v. 89, n. 10, p. 1432-1441, 2018.