Data/hora: 11/06/2024 21:17:39

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	10/08/2021	
Data da última atualização: 	10/08/2021	
Autoria: 	SILVA, H. T.; LOPES, P. S.; COSTA, C. N.; SILVA, F. F.; SILVA, D. A.; SILVA, A. A.; THOMPSON, G.; CARVALHEIRA, J.	
Afiliação: 	Universidade Federal de Viçosa; Universidade Federal de Viçosa; CLAUDIO NAPOLIS COSTA, CNPGL; Universidade Federal de Viçosa; Universidade Federal de Viçosa; Universidade Federal de Viçosa; GERTRUDE THOMPSON, Universidade do Porto; JÚLIO CARVALHEIRA, Universidade do Porto.	
Título: 	Autoregressive repeatability model for genetic evaluation of longitudinal reproductive traits in dairy cattle.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Journal of Dairy Research, v. 87, p. 37-44, 2021.	
DOI: 	https://doi.org/10.1017/S0022029919000931	
Idioma: 	Inglês	
Conteúdo: 	We investigated the efficiency of the autoregressive repeatability model (AR) for genetic evaluation of longitudinal reproductive traits in Portuguese Holstein cattle and compared the results with those from the conventional repeatability model (REP). The data set comprised records taken during the first four calving orders, corresponding to a total of 416, 766, 872 and 766 thousand records for interval between calving to first service, days open, calving interval and daughter pregnancy rate, respectively. Both models included fixed (month and age classes associated to each calving order) and random (herd-year-season, animal and permanent environmental) effects. For AR model, a first-order autoregressive (co)variance structure was fitted for the herd-year-season and permanent environmental effects. The AR outperformed the REP model, with lower Akaike Information Criteria, lower Mean Square Error and Akaike Weights close to unity. Rank correlations between estimated breeding values (EBV) with AR and REP models ranged from 0.95 to 0.97 for all studied reproductive traits, when the total bulls were considered. When considering only the top-100 selected bulls, the rank correlation ranged from 0.72 to 0.88. These results indicate that the re-ranking observed at the top level will provide more opportunities for selecting the best bulls. The EBV reliabilities provided by AR model was larger for all traits, but the magnitudes of the annual genetic progress were similar between two models. Overall, the proposed AR model was suitable for genetic evaluations of longitudinal reproductive traits in dairy cattle, outperforming the REP model.	
Palavras-Chave: 	Desempenho reprodutivo; Holstein cattle; Model evaluation.	
Thesagro: 	Bovino; Fertilidade; Gado Holandês; Reprodução Animal.	
Thesaurus Nal: 	Autocorrelation; Reproductive performance.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (25169-1) - UPC - AP - DD -  -  -  - DIS