Study of genetic and phenotypic parameters before weaning and after weaning using uni-variate model in Lori sheep

Data used in this study related to growth traits in Lori sheep that were collected during 2001 - 2010 by Research Center for Agriculture and Natural Resources of Lorestan province. Growth traits were consist of different ags (brithy, 3 month, 6 month and 9 month). Avarage weight Lori sheep was in birth weight 3.49 kg and in 9 month weight 29.79 kg. The SAS statistical software was used to determine the effect of environmental factors and WOMBAT software was applied to estimate genetic parameters with 6 different models via animal model analysis one trait REML parameters. Environmental factors like birth year, sex, type of birth and age of mother on lambing time had significant effect on all traits (p<0.0001). Type of birth and sex had significant effect on all traits except the 9 month age (p<0.0001). The direct heritability using best chosen model for birth weight, weaning weight, 6 months weight, 9 months weight were respectively obtained as follows: 0.34, 0.01, 0.16 and 0.1 and mathernal heritability for these traits were estimated 0.16, 0.03, 0.05 and 0.06, respectively.