the effect of melatonin treatment in combination with progestagen on reproductive performance of ewes during the anestrus period

to evaluate effects of melatonin treatment in combination with progestagen on reproductive performance of ewes during the anestrus period, 60 ewes were used and allocated randomly in two groups during the anoestrous peiod: all ewes synchronize by cidr and receive pmsg (600 iu) on the day of cidrs removal. ewes in group treatment( n=30 ) resived melatonin implants(18 mg) 35 days before inserting the cidrs. the other group of ewes( n=30 ) served as control. fertile rams were introduced into both groups at cidrs removal. induce estrus , fertility, litter size and fecundity were calculated. data were analyzed in chi- square method by sas soft were. induce estrous during fierst cycle in group treatment and control were 95, 100 percentage, fertility were 93.4, 40 percentage and fecundity were 0.54 and 1.6 and litter size were 1.71 and 1.4 respectively. results shown that melatonin treatment signgficantly improved reproductive performance in the lori ewes in out of season.