the effects of using artificial insemination techniques on reproductive performance in ghezel sheep

objective: the aim of the present study was to evaluate artificial insemination techniques on reproductive performance in ghezel ewes synchronized with cidr during breeding season. methods: all ewes were treated with controlled internal drug release device (cidr) inserted into the vagina of the ewes for 14 days. all ewes were treated a single intramuscular (im) dose of pmsg was injected. in this experiment 120 head ewes divided into four subgroups randomly and experimental groups consist of: control 1, ram mating, n=30; control 2, ram mating plus 550 iu pmsg, n=30; group 1, laparoscopical intrauterine insemination plus 550 iu pmsg, n= 30; group 2, cervical insemination plus 550 iu pmsg, n= 30. results: in this experiment estrus responses were similar in all groups (control 1, 76.7%; control 2, 93%; group 1, 96%; group 2, 100%). there were no statistically significant differences (p>0.05) between the treatment groups and the control groups for the estrus response. pregnancy rates were 70%, 90.0%, 83.3% and 60% in control groups 1, 2 and ai groups 1, 2 respectively. twinning rates (10% to 34.6%) and litter size (1.10 to 1.35) were significantly different in the treatment groups and the control group 1 (p