Interação genótipo-ambiente para a produção de leite em bubalinos no Brasil e na Colômbia
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Data
2009-08-27
Autores
Hurtado Lugo, Naudin Alejandro [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho teve como objetivo principal determinar a existência de interação genótipo ambiente em Bubalinos do Brasil e da Colômbia por meio da correlação genética para a produção de leite aos 240 (PL240) e aos 270 dias da lactação (PL270). Foram utilizados os arquivos genealógicos e de produção de 12 fazendas do Brasil, localizadas nos estados de São Paulo e Ceará e 5 fazendas da Colômbia, localizadas nos estados de Córdoba e Magdalena. Foram realizadas análises conjuntas para cada característica de tipo bicarácter nos dois países, considerando a produção de leite (PL) em cada país como uma característica distinta. Utilisou-se o método de máxima verossimilhança restrita (REML) com um algoritmo livre de derivações num modelo animal com medidas repetidas. Nas análises preliminares foram incluídos os efeitos fixos: Grupo Contemporâneo (Rebanho e Ano de parto), estação de parto, e como co-variável a idade da búfala (efeito linear e quadrático), os efeitos aleatórios genéticos aditivos de animal, do ambiente permanente da búfala e resíduo. A Correlação genética para a produção de leite foi estimada utilizando os registros produtivos das filhas dos reprodutores em comuns e distribuídas nos diferentes rebanhos para ambos os países. As médias estimadas para a PL240 e PL270 no Brasil e na Colômbia foram de 1638,00±652,00 kg e 871,90±322,90 kg e, 1722,00±703,00 kg e 917,40±356,20 kg, respectivamente. As variâncias genéticas, de ambiente permanente e residual, no Brasil e na Colômbia, diferiram e as estimativas da herdabilidade e da repetibilidade variaram para cada característica. As correlações genéticas no Brasil e na Colômbia foram de 0,10 e 0,13, entre PL240 e PL270, respectivamente. Os resultados indicaram a presença de interação genótipo...
The objective this study was determined the existence of genotype-environment interaction (GxE) in Brazil and Colombia dairy buffaloes through the genetic correlation of milk yield to 240 (MY240) and 270 (MY270) days of lactation. Data bases genealogical and productive were analyzed from herd of 12 farms in Brazil, located in the São Paulo and Ceará states, and 5 farms of Colombia, located in Cordoba and Magdalena states. Joint analyses were performed for each trait of bi-trait type in the two countries, considering milk yield (MY) in each country as a different trait. The restricted maximum likelihood method (REML) using a derivative-free algorithm applied to an animal model with repeated measures. In preliminary analysis were included as fixed effects of contemporary group (herd and year of birth) and birth season, as co-variable and age of buffalo birth (linear and quadratic effect) and that random effects additive genetic, permanent environment and residual. The genetic correlation for milk yield was estimated using the yield records of daughters of the common sires and distributed in different herds in the two countries. The estimated average in Brazil and Colombia for MY240 and MY270 were 1.638.00±652.00 kg and 871.90±322.90 kg and 1.722.00 ± 703.00 kg and 917.40 ± 356.20 kg, respectively. The genetic, permanent environmental and residual variance in Brazil and Colombia varied in each country and the estimates of heritability and repeatability were different for each trait. In Brazil and Colombia genetic correlations were 0.10 and 0.13 for MY240 and MY270, respectively. The results indicated presence of GxE between Brazil and Colombia for MY240 and MY270. This effect could have a considerable impact on the genetic evaluation of sires due to differences in classification of genotypes... (Complete abstract click electronic access below)
The objective this study was determined the existence of genotype-environment interaction (GxE) in Brazil and Colombia dairy buffaloes through the genetic correlation of milk yield to 240 (MY240) and 270 (MY270) days of lactation. Data bases genealogical and productive were analyzed from herd of 12 farms in Brazil, located in the São Paulo and Ceará states, and 5 farms of Colombia, located in Cordoba and Magdalena states. Joint analyses were performed for each trait of bi-trait type in the two countries, considering milk yield (MY) in each country as a different trait. The restricted maximum likelihood method (REML) using a derivative-free algorithm applied to an animal model with repeated measures. In preliminary analysis were included as fixed effects of contemporary group (herd and year of birth) and birth season, as co-variable and age of buffalo birth (linear and quadratic effect) and that random effects additive genetic, permanent environment and residual. The genetic correlation for milk yield was estimated using the yield records of daughters of the common sires and distributed in different herds in the two countries. The estimated average in Brazil and Colombia for MY240 and MY270 were 1.638.00±652.00 kg and 871.90±322.90 kg and 1.722.00 ± 703.00 kg and 917.40 ± 356.20 kg, respectively. The genetic, permanent environmental and residual variance in Brazil and Colombia varied in each country and the estimates of heritability and repeatability were different for each trait. In Brazil and Colombia genetic correlations were 0.10 and 0.13 for MY240 and MY270, respectively. The results indicated presence of GxE between Brazil and Colombia for MY240 and MY270. This effect could have a considerable impact on the genetic evaluation of sires due to differences in classification of genotypes... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Bufalo - Seleção, Leite, Selection, Buffaloes, Milk
Como citar
HURTADO LUGO, Naudin Alejandro. Interação genótipo-ambiente para a produção de leite em bubalinos no Brasil e na Colômbia. 2009. xv, 53 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2009.