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Genetic and phenotypic parameters of growth and reproduction traits in UAS strain of sheep estimated by multitrait animal model



Genetic and phenotypic parameters of growth and reproduction traits in UAS strain of sheep estimated by multitrait animal model



Indian Journal of Animal Sciences 63(9): 978-983



Additive genetic and residual variance and covariance components for growth and female reproductive traits were estimated by a maximum likelihood multitrait procedure using an animal model. Records on 1466 lambs of UAS strain (12 Deccani + 14 Bannur + 1/4 South Down collected during 1973-1990 at the University of Agricultural Sciences, Dharwar, Kamataka, were used. The multitrait animal model contained month and year of lambing as fixed effects and animal within year as random effect. The estimated variance and covariances were used to obtain heritabilities, and genetic and phenotypic correlations. For birth weight the estimates of heritability were 0.32 +- 0.08 and 0.54 +- 0.17 for male and female respectively. In males estimated heritabilities were 0.19 +- 0.05, 0.42 +- 0.12, 0.45 +- 0.14, 0.54 +- 0.15 and 0.50 +- 0.14 for body weight at 1, 2, 3, 4, 5 and 6 months respectively. The heritability estimates for body weight at 1, 2, 3, 4, 5 and 6 months of age in female were 0.43 +- 0.13, 0.30 +- 0.10, 0.35 +- 0.10, 0.42 +- 0.15, 0.54 +- 0.16 and 043 +- 0.13 respectively. For average daily gains (ADG) during 0-3 months of age the heritability estimates were 0.42 +- 0.14 and 0.49 +- 0.16 in males and females respectively. The heritability estimates for ADG during 3-6 months of age were 0.21 +- 0.10 and 0.27 +- 0.11 in males and females respectively. Heritabilities of age and weight at first lambing were 0.09 +- 0.04 and 0.27 +- 0.08 respectively. Heritability of first lambing intervals ranged between 0.10 and 0.16. Phenotypic and genetic correlations between birth weight and monthly weights up to 6 months of age were low. Phenotypic and genetic correlation between 3 and 6 months body weights were high and positive. The phenotypic correlations between 0-3 and 3-6 months ADG were small and between body weights and ADG's were from low to medium. Phenotypic and genetic correlations among female reproductive traits, between growth and female reproductive traits were low. The high heritability of 3-month body weight and its high genetic correlation with later body weight suggested that selection based on 3-month body weight would cause an improvement in market weight.

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