| Full text | |
| Author(s): |
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]
Total Authors: 8
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 46, n. 7, p. 1235-1241, OCT 2014. |
| Web of Science Citations: | 2 |
| Abstract | |
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) | |
| FAPESP's process: | 10/06185-4 - Strategies to improve efficiency of genomic selection in animal breeding programs |
| Grantee: | Haroldo Henrique de Rezende Neves |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/16066-5 - Genetic relations between the number of calving before 53 months, rebreeding subsequent of primiparous, ability to stay and scrotal circumference in Nelore cattle |
| Grantee: | Aline Rocha Guarini |
| Support Opportunities: | Scholarships in Brazil - Master |