Herd-of-origin effect on the post-weaning performance of centrally tested Nellore beef cattle

Autor(es)

de Rezende Neves, Haroldo Henrique ^[1] ; dos Reis, Felipe Polin ^[2] ; Paterno, Flavia Motta ^[1] ; Guarini, Aline Rocha ^[1] ; Carvalheiro, Roberto ^[1] ; da Silva, Lilian Regina ^[3] ; de Oliveira, Joao Ademir ^[1] ; de Queiroz, Sandra Aidar ^[1]

Afiliação do(s) autor(es)

^[1] Fac Ciencias Agr & Vet, BR-14884900 Jaboticabal, SP - Brazil

^[2] Agr Corumbiara SA, BR-76979000 Parecis, RO - Brazil

^[3] Neogen Brasil, BR-13347402 Indaiatuba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 46, n. 7, p. 1235-1241, OCT 2014.
• Citações Web of Science: 2

Resumo

The objective of a performance test station is to evaluate the performance of potential breeding bulls earlier in order to decrease the generation interval and increase genetic gain as well. This study evaluates the herd-of-origin influence on end-of-test weight (ETW), average daily weight gain during testing (ADG), average daily weight gain during the adjustment period (ADG(adj)), rib eye area (REA), marbling (MARB), subcutaneous fat thickness (SFT), conformation (C), early finishing (EF), muscling (M), navel (N) and temperament (T) scores, and scrotal circumference (SC) of Nellore cattle that underwent a performance test. We evaluated 664 animals that participated in the performance tests conducted at the Center for Performance CRV Lagoa between 2007 and 2012. Components of variance for each trait were estimated by an animal model (model 1), using the restricted maximum likelihood method. An alternative animal model (model 2) included, in addition to the fixed effects present in S1, the non-correlated random effect of herd-year (HY). A significant HY effect was observed on ETW, REA, SFT, ADG(adj), C, and C-w (p < 0.05). The estimated heritability of all traits decreased when the HY effect was included in the model; also, the bull rank, in deciles, changed significantly for traits ETW, REA, SFT, and C. The adjustment period did not completely remove the environmental effect of herd of origin on ETW, REA, SFT, and C. It is recommended that the herd-of-origin effect should be included in the statistical models used to predict the breeding values of the participants of these performance tests. (AU)

• Processo FAPESP: 10/06185-4 - Estratégias para aumento de eficiência da seleção genômica em programas de melhoramento genético animal
• Beneficiário: Haroldo Henrique de Rezende Neves
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/16066-5 - Relações genéticas entre número de partos até 53 meses, reconcepção de primíparas, habilidade de permanência e perímetro escrotal em bovinos da raça Nelore
• Beneficiário: Aline Rocha Guarini
• Modalidade de apoio: Bolsas no Brasil - Mestrado