Document Type : Research Paper
Authors
Abstract
In this study, the effects of using fat in flushing diet on conception and lambing rate of Lori-Bakhtiari ewes was evaluated. Three-hundred dry and healthy ewes with 2-7 years of age randomly divided into three groups (n=100) in a completely randomized design for receiving three diets as: group 1 (control): no flushing (treatment 1), group 2: 250 grams barley grain per each ewe (treatment 2) and group 3: 144.5 grams barley grain + 50 grams supplemental fat per each ewe (treatment 3). Ewes received dietary supplements from two weeks before up to three weeks after ram introduction. Conception rate in different heat periods, overall conception rate, lambing and twining rate were recorded. Conception rate at first heat period in ewes in treatment 3 was higher than the other groups and in second heat period was higher than treatment 1 (P<0.05). Although treatments means were differed from each other in overall conception rate, but the differences were not significant (P>0.05). Ewes with scores 2.5 and 4.5 had the lowest conception rate respectively and the highest was in ewes with scores 3-4 (P <0.05). Lambing and twining rates in treatment 3 ewes were higher than treatment 1 (P<0.05). Number of lambs born per ewe exposed in nonparametric analysis was significantly higher in fat supplement treatment (P<0.05). Survival rate of lambs at born was not significant (P>0.05) in three groups. In general, using fat in flushing diet of Lori-Bakhtiari ewes improved lambing rate.
Keywords
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