Pregnancy rate following artificial insemination or natural service in postpartum estrus synchronized beef cattle

Authors : Abdul MALIK, Abd Wahid HARON, Rosnina YUSOFF, Azhar KASIM, Sabri Mohd YUSOFF

Pages : 451-455

View : 13 | Download : 12

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The objective of this study was to investigate the pregnancy rate following artificial insemination insert ignore into journalissuearticles values(AI); or natural service insert ignore into journalissuearticles values(NS); in postpartum estrous synchronized beef cattle. A total of 85 Brangus cows, postpartum, were divided into 2 groups. Group 1 consisted of 35 cows and was further subdivided into 7 groups, each consisted of 5 cows that were naturally mated. Group 2 consisted of 40 cows that were artificially inseminated. Estrus synchronization was carried out using a controlled internal drug releasing device insert ignore into journalissuearticles values(CIDR); containing 1.38 mg of progesterone, for 7 days. Group 1 cows were mixed with bulls at a 1:5 ratio of bull:cows for 7 days and group 2 cows were inseminated 55-58 h after the CIDR removal. Pregnancy was determined using transrectal ultrasonography 32 days after NS and AI. The pregnancy rate was higher in the NS group insert ignore into journalissuearticles values(28.6%); than in the AI group insert ignore into journalissuearticles values(18.0%);, but the difference was not significant insert ignore into journalissuearticles values(P > 0.05);.
Keywords : Key words Natural service, artificial insemination, estrus synchronization, conception rate