عنوان مقاله [English]
This study was aimed to evaluate the effects of supplementary feeding on productive and reproductive performance of Zel sheep breed, in mating, late pregnancy and lactating periods. For this purpose, 120 ewe Zel, 2-5 years old, average body weight of 33.8 ± 4.78 kg that had reproductive, were selected from the Zel flock of National research station of Gavdashat Mazandaran province and divided to two same group. The treatments contained; The first group (control); the ewes fed with basal diet + 100 gr concentrates in late pregnancy and the first two months of lactating, The second group (Experimental group); the ewes fed with basal diet + 200, 300 and 400 gr concentrates in mating, late pregnancy and the first two months of lactating periods, respectively. Each group was divided to two subgroups of 30 heads, and then entrance to a pen with a ram for 40 days. The results showed that, apparent fertility, prolificacy, ewe reproductive performance, and ewe productive performance of control and experimental groups, were 85% and 90%, 111.8% and 114.8%, 95% and 103.3%, and 91.7% and 107.7%, respectively. The live body weight of ewe after parturition, was not significant between control and experimental groups. The lamb’s birth weight of experimental group (3.4 kg) was significantly higher than control group (3.0 kg, (p<0.05), but the weaning weight of lambs (13.5 and 14.7 kg, in control and experimental group respectively), did not affected by supplementary feed. In general, using supplementary dietary in concentrate form, in mating, late pregnancy, and lactating periods, improves the reproduction performance, and ewe production performance, and economical efficiency of sheep breeding units.