Genetic parameters of body weight in sheep estimated via random regression and multi-trait animal models |
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| Authors: | A Wolc E Barczak J Wójtowski P ?lósarz T Szwaczkowski |
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| Institution: | aDepartment of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska St. 33, 60-637 Poznan, Poland;bDepartment of Animal Science, Iowa State University, 239C Kildee Hall, Ames, IA, 50011-3150, USA;cDepartment of Small Mammal Breeding and of Animal Materials, Poznan University of Life Sciences, Zlotniki, Sloneczna St. 1, 62-002 Suchy Las, Poland |
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| Abstract: | Variance components for five consecutive measurements of body weight in Polish sheep were estimated using random regression and multi-trait animal models. The data included between 7856 and 31694 body weight records at 5 age classes from birth to 150 days of age. The random additive genetic, maternal environmental and individual permanent environmental effects were fitted. All variance components were increasing over time (not at equal rates), which reflects increasing phenotypic mean and variance with age. Direct heritability tended to increase with age, whereas the effect of dam was reduced for older ages, and the proportion of permanent environmental component was relatively stable. Generally, similar tendencies were registered for estimates obtained via multi-trait animal model. The results confirm that there is a scope for genetic improvement in growth pattern in Polish sheep. |
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| Keywords: | Polish sheep Body weight Heritability Random regression Multitrait animal model |
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