This study was carried out to evaluate the effect of Dalmarelin (Lecirelin acetate, GnRH analogue) administration at the time of artificial insemination (AI) on conception rate in repeat breeding crossbred cows. A total of 64 cows maintained at the Military Farm Okara, Pakistan were included in the study. The experimental cows were divided into two groups A and B with 32 cows in each group.  The average age and lactation number of cows of the control and treatment groups did not differ.  Cows of group A received no treatment at the time of AI and served as untreated control, while 32 cows of group B received Dalmarelin therapy at the time of AI. The cows were examined for pregnancy 60 days post insemination per rectum. A total of 12 animals out of 32 were pregnant with a conception rate of 37.5% in control group and in treatment group 22 animals out of 32 were pregnant, having conception rate of 68.75% (P<0.05).  The study revealed that use of GnRH analogue therapy improved the conception rate in repeat breeding crossbred cows when it was administered at the time of AI.

Key words: Conception rate, GnRH, crossbred cows.