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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
09/10/1998 |
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Data da última atualização: |
07/04/2025 |
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Autoria: |
FREITAS, A. F. de; WILCOX, C. J.; COSTA, C. N. |
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Afiliação: |
ARY FERREIRA DE FREITAS, CNPGL; UNIVERSITY OF FLORIDA; CLAUDIO NAPOLIS COSTA, CNPGL. |
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Título: |
Breed group effects on milk production of brazilian crossbred dairy cows. |
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Ano de publicação: |
1998 |
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Fonte/Imprenta: |
Journal of Dairy Science, v. 81, n. 8, p. 2306-2311, 1998. |
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DOI: |
https://doi.org/10.3168/jds.s0022-0302(98)75811-4 |
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Idioma: |
Inglês |
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Conteúdo: |
Lactation records (n = 2362) of 1402 crossbred cows in 22 cooperating dairy herds in southeastern Brazil were evaluated. Cows were mixtures of Zebu (Gir, Guzera, and unknown) and European breeding (mostly Holstein). Lactation milk yields were expressed as total, 305-d, or deviated 305-d yields, either adjusted or unadjusted for days in milk (DIM). Mean DIM was 280. Arithmetic means unadjusted for DIM were 1942, 1666, and 5 kg per record. Milk yields of daughters from sires of 6/8 and 7/8 European breeds were higher than yields of daughters from sires of 5/8 European breeds when data were either adjusted or unadjusted for DIM. The differences associated with breed group of sire were only slightly reduced when records were adjusted for DIM. There was no evidence of a decline in milk yield as the fraction of European breeding of the sire increased from 6/8 to 7/8. For a given breed group of sire, whether the grandsire was purebred or crossbred had no detectable effect. These results should be useful in determining strategies for crossbreeding of dairy cows in tropical areas, particularly when crossbred sires are used. |
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Palavras-Chave: |
Brasil; Crossbreeding. |
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Thesagro: |
Leite. |
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Thesaurus Nal: |
Brazil; milk yield. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01769naa a2200217 a 4500
001 1593025
005 2025-04-07
008 1998 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.3168/jds.s0022-0302(98)75811-4$2DOI
100 1 $aFREITAS, A. F. de
245 $aBreed group effects on milk production of brazilian crossbred dairy cows.$h[electronic resource]
260 $c1998
520 $aLactation records (n = 2362) of 1402 crossbred cows in 22 cooperating dairy herds in southeastern Brazil were evaluated. Cows were mixtures of Zebu (Gir, Guzera, and unknown) and European breeding (mostly Holstein). Lactation milk yields were expressed as total, 305-d, or deviated 305-d yields, either adjusted or unadjusted for days in milk (DIM). Mean DIM was 280. Arithmetic means unadjusted for DIM were 1942, 1666, and 5 kg per record. Milk yields of daughters from sires of 6/8 and 7/8 European breeds were higher than yields of daughters from sires of 5/8 European breeds when data were either adjusted or unadjusted for DIM. The differences associated with breed group of sire were only slightly reduced when records were adjusted for DIM. There was no evidence of a decline in milk yield as the fraction of European breeding of the sire increased from 6/8 to 7/8. For a given breed group of sire, whether the grandsire was purebred or crossbred had no detectable effect. These results should be useful in determining strategies for crossbreeding of dairy cows in tropical areas, particularly when crossbred sires are used.
650 $aBrazil
650 $amilk yield
650 $aLeite
653 $aBrasil
653 $aCrossbreeding
700 1 $aWILCOX, C. J.
700 1 $aCOSTA, C. N.
773 $tJournal of Dairy Science$gv. 81, n. 8, p. 2306-2311, 1998.
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