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Articles by A. Keshtkaran
Total Records ( 2 ) for A. Keshtkaran
  T. Farahvash , J. Shodja , A. Rafat and A. Keshtkaran
  In order to study the effect of bilateral crossbreeding between Arkhamerino (Ar) and Ghezel (G) sheep on the quality of wool produced by their F1 crosses, 16 ArkhamerinoxGhezel (ArG) F1 sheep and 53 GhezelxArkhamerino (GAr) F1 sheep were sampled. Fiber Diameter (FD), Coefficient of variation of fiber diameter (CVf) and Staple Length (SL) were traits measured on wool samples. The variations between obtained data were analyzed for genotype, sex and birth type. The results showed that the FD was not affected by any of the factors in model. Genotype, had significant effect on CVf and SL (p<0.01) and the effect of sex on the SL was significant (p<0.01). Also twin F1s produced longer staples than single crosses (p<0.01). Bilateral crossbreeding between Ar and Gh sheep did not make considerable changes in FD of wool produced by their F1 crossbreds but CVf and SL of wool have been influenced.
  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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