Genetic Parameters Estimation of Prolificacy Traits under the FecB Introgression Pressure in Afshari Sheep Breed
الموضوعات :M. Pourtahmasebian Ahrabi 1 , M.P. Eskandarinasab 2 , M. Bagher Zandi Baghcheh Maryam 3
1 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
3 - Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
الکلمات المفتاحية: reproductive traits, genetic trend, Afshari sheep, variance components, breeding strategy, FecB gene,
ملخص المقالة :
The aim of present research was to estimate genetic parameters and trends of prolificacy traits in Afshari sheep breed under the FecB gene introgression breeding program. In this research, phenotypic data were collected from 2000 to 2015 at the Research Station of University of Zanjan. The reproductive traits include the total number of lambs born (NLB) and number of lambs at weaning (NLW), and composite traits as total litter weight at birth (TLWB) and total ltter weight at weaning (TLWW). The data were analysed using ASReml software according to restricted maximum likelihood (REML) procedure. The fixed model effects parameters were: year, season, age of ewe. Results showed genetic group and number of parturition in the model were significant (p
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