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This study was aimed to evaluate the effects of supplementary feeding on production and reproduction performance and economical efficiency of Zel sheep breed, in mating, late pregnancy and lactating periods. For this purpose, 120 ewe Zel, 2-5 years old, 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 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 two months of lactating periods, respectively. Each group was divided to two subgroups, each = 30 heads, and then entrance to a pen with a ram for 40 days. The results showed that, Apparent fertility, prolificacy, ewe reproduction performance, and ewe production 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 after parturition, was not significant between control and experimental groups. The lamb’s birth weight (3.0 and 3.4 kg) and weaning weight (13.5 and 14.7 kg), in experimental group, was higher than control, significantly (p<0.05). Gross profit of estimated sailing weaned lamb live body weight per ewe, in experimental group (6067176 Rials) was more than control group (5473560 Rials). 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. Keywords: pregnancy, supplementary feeding, weaning, Zel sheep.
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