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Performance, carcass traits and serum metabolomic profile of Nellore males with different genetic potential for post-weaning growth

Texto completo
Autor(es):
da Costa, M. B. [1] ; Consolo, N. R. B. [1] ; Silva, J. [1] ; Buarque, V. L. M. [1] ; Padilla, A. R. H. [2] ; Coutinho, I. D. [2] ; Barbosa, L. C. G. S. [2] ; Colnago, L. A. [2] ; Silva, S. L. [1] ; Saran Netto, A. [1]
Número total de Autores: 10
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Zootecnia, BR-13635900 Pirassununga, SP - Brazil
[2] Empresa Brasileira Pesquisa Agr EMBRAPA Instrumen, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: ANIMAL; v. 14, n. 4, p. 873-880, APR 2020.
Citações Web of Science: 0
Resumo

The BW has been largely used as a selection criterion in genetic selection programmes; however, increases in BW can affect animal metabolism and metabolites. The knowledge of how genetic potential for growth affects the metabolites can give a footprint of growth metabolism. This research aimed to evaluate the effect of genetic potential for post-weaning growth (GG) on performance, carcass traits and serum metabolome of non-castrated Nellore males during the finishing phase. Forty-eight Nellore non-castrated males, with divergent potential for post-weaning growth, were selected and divided into two groups: high potential for post-weaning growth (HG; n = 24) and low potential for post-weaning growth (LG; n = 24). Animals were kept and fed for 90 days where performance and ultrasound carcass traits were evaluated. Blood samples were collected at the beginning and end of feeding period to analyse serum metabolites concentration. The hot carcass weight and dressing percentage were recorded at slaughter. The feedlot performance and carcass traits were not affected by genetic potential. The HG animals had a lower glucose (P = 0.039), glutamate (P = 0.038), glutamine (P = 0.004), greater betaine (P = 0.039) and pyruvate (P = 0.039) compared to the LG group at the beginning of feedlot. In addition, higher creatine phosphate concentrations were observed at the beginning of feeding period, compared to final, for both groups (P = 0.039). In conclusion, the genetic potential for post-weaning growth does not affect performance and carcass traits during the finishing period. Differences in metabolite concentrations can be better found at the beginning of feedlot, providing a footprint of growth metabolism, but similar metabolite concentration at the end of finishing period. (AU)

Processo FAPESP: 16/17433-5 - Estudo da relação entre a diferença esperada na progênie (DEP) com características produtivas e de qualidade da carne em bovinos Nelore
Beneficiário:Saulo da Luz e Silva
Linha de fomento: Auxílio à Pesquisa - Regular