University of Tehran Press Journal of Veterinary Research 2008-2525 56 4 2002 01 21 - - 16921 FA Journal Article 1970 01 01 An experiment was carried out to evaluate and compare the natural mating and Artificial Insemination (Al) in a commercial broiler breeders (ARIAN hybrid). To assay the effects of factors including: number of insemination (one or two times per week), depth of insemination (3 or 5 cm) and time of insemination (5 P.M or 7:30 P.M), the experiment was carried out in completely randomized design with 3 replications and 4 hens per each group. The experimental period was 8 weeks. The results of the study were showed that the hatchability rate in two times insemination per week was significantly higher than one insemination per week (P<0.01). The hatchability rate in insemination with 5 cm depth was significantly higher that 3 cm depth at the level of(P<0.05). Insemination at 7:30 P.M showed significantly higher hatchability rate than 5:00 P.M (P<0.0l). Two times a week insemination at 7:30 P.M in 5 cm depth gave the best result, in first 5 weeks of the study. The hatchability rate of natural mating was significantly higher that Al from I to 5 weeks of test. But there was no differences between two treatments from 6 to 8 weeks. At 7th and 8th weeks the hatchability rate of Al was slightly higher than natural mating. An experiment was carried out to evaluate and compare the natural mating and Artificial Insemination (Al) in a commercial broiler breeders (ARIAN hybrid). To assay the effects of factors including: number of insemination (one or two times per week), depth of insemination (3 or 5 cm) and time of insemination (5 P.M or 7:30 P.M), the experiment was carried out in completely randomized design with 3 replications and 4 hens per each group. The experimental period was 8 weeks. The results of the study were showed that the hatchability rate in two times insemination per week was significantly higher than one insemination per week (P<0.01). The hatchability rate in insemination with 5 cm depth was significantly higher that 3 cm depth at the level of(P<0.05). Insemination at 7:30 P.M showed significantly higher hatchability rate than 5:00 P.M (P<0.0l). Two times a week insemination at 7:30 P.M in 5 cm depth gave the best result, in first 5 weeks of the study. The hatchability rate of natural mating was significantly higher that Al from I to 5 weeks of test. But there was no differences between two treatments from 6 to 8 weeks. At 7th and 8th weeks the hatchability rate of Al was slightly higher than natural mating. https://jvr.ut.ac.ir/article_16921_240141bdfc231b1b72954562795a75c5.pdf