TY - JOUR T1 - Performance Estimation and Study of Some Environmental Reproductive Traits in Bakhtiari Sheep TT - برآورد عملکرد و بررسی تاثیر برخی از عوامل محیطی موثر بر صفات تولید مثلی در گوسفندان نژاد بختیاری JF - JCPP JO - JCPP VL - 4 IS - 1 UR - http://jcpp.iut.ac.ir/article-1-128-en.html Y1 - 2000 SP - 105 EP - 118 KW - Bakhtiari sheep KW - Reproductive traits KW - Environmental factors. N2 - In this study 2510 records of reproductive traits from the mating of 879 ewes with 164 rams of Bakhtiari sheep breed, during 1989 to 1997, were used in order to estimate the effects of environmental factors on their reproductive performance. The mean and standard errors of reproductive traits were as follows: conception rate, 0.9±0.01 number of lambs born per ewe exposed, 1.06±0.01 number of lambs born alive per ewe exposed, 1.01 ±0.0l, number of lambs weaned per ewe exposed, 0.93±0.01 litter size alive at birth, 1.10±0.01 litter size at weaning, 1.01±0.02 and number of lambs weaned per lambing ewe, 1.09±0.01. The effect of joining year was highly significant (P, 0.01) for all of the considered reproductive traits. Age of ewe at joining time was also a significant (P M3 ER -