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Breed, heterosis, and recombination effects for lactation curves in Brazilian cattle. Repositório Alice
DALTRO, D. dos S.; PADILHA, A. H.; GAMA, L. T. da; SILVA, M. V. G. B.; COBUCI, J. A..
The objective of this study was to estimate the breed, heterosis, and recombination effects on different components of the lactation curve of Girolando cattle. The dataset used consisted of 12,121 purebred cows of Holstein (H) and Gyr (G) breeds, and six H×G crossbred cows (Girolando). The model used presents random effects of herd and cow, regression coefficient associated with linear effect of proportion of H breed, regression coefficient associated with the linear effect of heterosis between H and G breeds, regression coefficient associated with the linear effect of recombination between H and G breeds, and random effect of residual. Dijkstra?s (DJ), Nelder's (ND), Wilmink's (WL), and Wood's (WD) models were tested to fit production records of these...
Tipo: Artigo de periódico Palavras-chave: Rendimento máximo; Persistência; Heterose; Gado Leiteiro; Cruzamento Animal; Raça; Curva de Lactação; Girolando.
Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133418
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Estimates of genetic and crossbreeding parameters for 305-day milk yield of Girolando cows. Repositório Alice
DALTRO, D. dos S.; SILVA, M. V. G. B.; GAMA, L. T. da; MACHADO, J. D.; KERN, E. L.; CAMPOS, G. S.; PANETTO, J. C. do C.; COBUCI, J. A..
The objective of this work was to evaluate the effects of breed and heterosis on the estimates of genetic parameters of 305-day milk yield (305MY), by fitting milk yield data to the Wood, Mixed Log, Morgan, and Wilmink non-linear models. A total of 258,891 test-day milk yield records of 37,965 Holstein (H), Gyr (G), and Girolando (1/2 H, 1/4 H, 3/4 H, 3/8 H, 5/8H and 7/8H genetic groups) cows from 1840 herds were collected in the state of Minas Gerais, Brazil, in the period of 1998 to 2014. The pedigree file included 36,640 animals, 3677 bulls and 24,472 cows. The genetic parameters were obtained by one-character analysis using the AIREMLF90 software. The heritability estimates of 305MY, and of 305MY fitted to the different nonlinear models ranged from...
Tipo: Artigo de periódico Palavras-chave: Heterose; Vaca Leiteira; Gado Leiteiro; Modelo Matemático; Bovino; Dairy cows; Heritability; Heterosis; Mathematical models.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133496
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