Comparison of growth performance of Chall male lambs from inbreeding and outbreeding in Qazvin region flocks

The objective of this study was investigation of growth performance, body and fat-tail measurements of Challmale lambs from outbreeding in Qazvin region. Two hundred 18 month old ewe lamb were divided randomly from a 1000-head flock in two groups. The first group (control) was mated with rams from same flock and the second group (treatment) mated with rams from other flock. After lambing, ten male lambs from each group were selected randomly for recording body dimensions and fat-tail measurements. Results indicated that average circumference of neck, fat-tail length at middle part and fat-tail circumference at upper part in the treatment group was significantly higher than control group (P<0.05). Birth weight, weight at two, four, six and eight months, final weight gain and body height, length body, circumference of heart girth, loin width, diagonal length, and fat-tail measurements including length at right, left and gap part; width at up, middle and down part; circumference at up, middle and down part; depth at up, middle and down part and fat-tail weight were not affected by the experimental groups (P>0.05). In total, using ram from other flocks had no effect on lamb performance.