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Articles by A. Lavvaf
Total Records ( 3 ) for A. Lavvaf
  A. Lavvaf , A. Noshari and T. Farahvash
  In order to evaluate the relation between body measurements (body length, stator, chest girth, body depth and romp width) with carcass traits (live weight, warm carcass weight, warm carcass efficiency, warm carcass weight without fat-tail and warm carcass without fat-tail efficiency), records from 200 Afshari and Zandi rams collected. Genetic group had effect on the warm carcass efficiency (p<0.01) and Zandi rams had higher efficiency. Chest girth affected by genetic group (p<0.05) which Afshari rams had bigger chest girth. Both genetic groups had high correlations between chest girthxlive weight, romp widthxlive weight, chest girthxwarm carcass weight without fat-tail, live weightxwarm carcass weight without fat-tail, warm carcass weightxwarm carcass weight without fat-tail. Results showed that chest girth was the best index in predicting body weight to 6 months of age at both genetic groups. Live weight at 6 months could be used to predict the warm carcass weight and warm weight without fat-tail. Chest girth and romp width in Afshari and Zandi, respectively were suitable factors for predicting warm carcass weight and warm carcass weight without fat-tail.
  A. Lavvaf and A. Noshary
 

The effects of different environmental factors and estimation of genetic parameters on early growth traits for Lori breed sheep including birth weight, weaning weight and body weight at 6 months of age using 19960 records from 35 herds of Lorestan Jahad Agriculture Organization were studied in the cities of Aleshtar, Khorramabad and Poldokhtar from 1995 to 2003. The effect of herd, sex of lambs, dam age and birth year on all traits and birth type had significant effect only on weaning weight. Different single trait animal models estimated the components of direct additive genetic variance, maternal genetic variance and maternal permanent environment variance through restricted maximum likelihood using environmental factors as a fixe effect and different random effects. The results showed that direct additive genetic effect had additionally significant effect on all traits moreover maternal additive genetic and maternal permanent environment effects. Results also revealed that the maternal permanent environment variance for all traits is higher than maternal genetic variance. Also the direct heritability for all traits was higher than maternal heritability. Estimation of the direct heritability from the birth to 6 months of age showed a reducing trend that could arise from high dependence of birth and weaning weight on maternal environment conditions as compared with the age conditions afterward. The genetic assessment of growth traits in Lori breed sheep without inclusion of maternal effect in animal model causes decreased selection accuracy and incorrect genetic assessment of the lambs.

  A. Lavvaf , A. Noshary and A. Keshtkaran
  The effects of environmental factors on early growth traits (birth weight, weaning weight, body weight at 6 months of age and daily gain from birth to weaning and weaning to 6 months of age) using 10432 records in Moghani sheep breed were studied and Genetic and Environmental variance component were estimated using 8468 records of Jafarabad Animal Breeding Station from 1999 to 2004. Birth year on all traits and dam age had significant effect only for birth and weaning weight. Sex of lambs and birth type had no significant effect only daily gain from weaning to 6 months of age. Additive genetic direct variance, maternal environmental variance and heritability were estimate by REML fitting two different Animal models. The estimate of maternal environment variance was higher than additive genetic direct variance in some traits. Estimates of direct heritability for all traits were low.
 
 
 
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