Data/hora: 24/09/2024 02:04:00

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	18/03/2011	
Data da última atualização: 	15/02/2024	
Autoria: 	COSTA, C. N.; CARVALHEIRA, J.; COBUCI, J. A.; FREITAS, A. F. de; THOMPSON, G.	
Afiliação: 	CLAUDIO NAPOLIS COSTA, CNPGL; J. CARVALHEIRA, UNIVERSITY OF PORTO, PORTUGAL; JAIME ARAÚJO COBUCI, UFRS; ARY FERREIRA DE FREITAS, Pesquisador aposentado do CNPGL; G. THOMPSON, UNIVERSITY OF PORTO, PORTUGAL.	
Título: 	Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model.	
Ano de publicação: 	2010	
Fonte/Imprenta: 	South African Journal of Animal Science, v. 39, n. 5, p. 165-168, 2010.	
Idioma: 	Inglês	
Conteúdo: 	This study was aimed to estimate variance components and genetic parameters for daily fat and protein yields of Brazilian Holstein cattle, using an autoregressive test day multiple lactations (AR) animal model. Data consisted of test day (TD) records produced by Holstein cows under milk recording supervised by the Brazilian Holstein Association, calving from 1993 to 2004. Medium to high heritability estimates (from 0.18 to 0.30 and from 0.30 to 0.43 for fat and protein TD yields, respectively) suggest opportunities for larger genetic gain by selection. Results from this study confirm the potential of using TD yields to replace the lactation model to estimate breeding values of Holstein cows in Brazil. Further studies are needed to compare these results with other modelling approaches e.g., the RR model.	
Palavras-Chave: 	Milk components; Selection; Test-day model; Variance components.	
Thesaurus Nal: 	dairy cattle.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/doc/881486/1/Estimation-of-genetic-parameters-of-test-day-fat-and-protein-yields.pdf	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (18017-1) - UPC - AP - DD -  -  -  - DIS