Does virginiamycin supplementation affect the metabolism and performance of Nellore bulls grazing under low and high gain rates?

Autor(es)

Costa, Joao Paulo R. ^[1] ; De Jesus, Raphael B. ^[1] ; Oliveira, Ivanna M. ^{[2, 1]} ; Resende, Flavio D. ^{[2, 1]} ; Siqueira, Gustavo R. ^{[2, 1]} ; Malheiros, Euclides B. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Dept Anim Sci, Jaboticabal - Brazil

^[2] APTA, Dept Anim Sci, BR-14770000 Colina, Rui Barbosa - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL SCIENCE JOURNAL; v. 89, n. 10, p. 1432-1441, OCT 2018.
• Citações Web of Science: 1

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 +/- 2months, body weight=258 +/- 15kg) were assigned to 16 paddocks in a 2x2 randomized block factorial arrangement. In experiment 2, 12 cannulated Nellore bulls were assigned to three 4x4 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 (11kg, 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. (AU)

• Processo FAPESP: 13/10340-3 - Estratégias Alimentares na Recria e Terminação de Bovinos Nelore
• Beneficiário: Ivanna Moraes de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/01961-2 - Metanálise de diferentes planos nutricionais durante recria e seu impacto na terminação de bovinos de corte em regiões tropicais
• Beneficiário: Ivanna Moraes de Oliveira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado