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- W2915156744 abstract "As funcoes de Brody e Richards foram utilizadas para ajustar a curva de crescimento de 22.699 animais da raca Nelore, criados na regiao Nordeste. Apos ser verificado que a curva de Brody promoveu melhor ajuste dos dados, esta foi utilizada para derivar caracteristicas de crescimenti e maturacao, como os pesos e as taxas de crescimento aos 365 e 550 dias de idade, o peso adulto e a taxa de maturacao. As variâncias geneticas, direta e materna, as covariâncias geneticas e as variâncias ambientais para estas caracteristicas e para o peso ao desmame foram estimadas pelo metodo da Maxima Verossimilhanca Restrita (REML), utilizando-se modelos animais com duas caracteristicas, utilizando sempre o peso ao desmame com cada uma das outras caracteristicas. Um modelo animal bi-variado, incluindo o peso adulto e a taxa de maturacao, tambem foi avaliado. As estimativas de herdabilidade direta para as taxas de crescimento variaram de 0,23 a 0,47 e para as caracteristicas de maturacao de 0,11 a 0,86. Estimativas de correlacoes geneticas entre o peso ao desmame e demais caracteristicas, como pesos preditos e taxas de crescimento, variaram de 0,67 a 0,86. As estimativas de herdabilidade sugerem a possibilidade de alterar a forma da curva de crescimento da populacao estudada atraves da selecao massal. Uma correlacao genetica negativa entre o peso adulto e a taxa de maturacao foi verificada. ABSTRACT Brody and Richards functions were tested to fit the growth curve of 22,699 animals of Nellore breed raised in the Northeast region of Brazil. Both curves were tested and due to the best fit, Brody curves were utilized to derive growth and maturing traits, such as weights and growth rates at 365 and 550 days, the age at which animals reached 65% of mature weight, relative growth rates and degrees of maturity at 365 and 550 days, mature weights and maturation rate index. Direct and maternal genetic and environmental variances and covariances were estimated for these traits and for weaning weight by REML, from a set of two-trait animal models including weaning weight paired with the other traits. A two-trait animal model including mature weight and maturation rate index were performed as well. Direct heritability estimates for growth rates ranged form 0.23 to 0.47, and for maturation traits from 0.11 to 0.86. Estimates of direct genetic correlations of weaning weight with predicted weights and growth rates ranged from 0.67 to 0.86. The estimates of heritability suggest the possibility to alter the shape of the growth curve of the studied population by mass selection. The negative genetic correlation between mature weight and rate of maturing was verified." @default.
- W2915156744 created "2019-03-02" @default.
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- W2915156744 date "2003-12-12" @default.
- W2915156744 modified "2023-10-11" @default.
- W2915156744 title "Estimates of genetic parameters for weights and maturing traits derived by growth functions in Nellore cattle." @default.
- W2915156744 hasPublicationYear "2003" @default.
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