Lori-Bakhtiari sheep is a fat-tailed and relatively large-sized. It is distributed in the south western part of Iran. The typical sheep belong to the Bakhtiari tribe and are white, but black and brown animals are also found among the sheep. A large portion of the phenotypic expression of a lamb’s body weight is due to enviromental factors. Consequently, estimates of these non-genetic factors will enable a breeder to make adjustments for them and improve the accuracy of selection. The significant effect of age of dam on birth weight and weaning weight of lambs have been reported by some researchers ( Eltawil et al. 1970; Boujenane et al. 1991; Yamaki and Sagae 1991; Saeid Bathaei and Leroy 1998; Dixit et al. 2001 ). Many results have been reported that indicate significant effects year, sex and type of birth lambs on preweaning traits  ( Eltawil et al. 1970; Farid and Makarechian 1976; Saoud et al. 1984; Yamaki and Sagae 1991; Burfening and Carpio 1993. Saeid Bathaei and Leroy. 1998; Dixit et al. 2001). The objective of this study was to evaluate the effect of non-genetic parameters on birth weight, weaning weight and daily gain from birth to weaning of Lori-Bakhtiari lambs

M. A Talebi

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 11, , 11.28, 2002
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