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This study was performed on 45 lactating Holstein – Friesian cows suffered from inactive ovaries for three months post partum and diagnosed clinically by rectal palpation in the form of the college of Agriculture / University of Baghdad , their ages 3-5 years during the period from 2010-2012. These cows were divided randomly into 4 groups, 1 st group (12 cows) were injected with 0.021mg (5 ml) Receptal I/M, 2 nd group (12 cows) were given 500 μg (5ml) Cystorelyin I/M, 3 rd group (12 cows) injected with 0.5 mg (5 ml) Fertagil I/M in one dose and 4 th group (9 cows) without treatment (control group). The response rate was 91.8%, 83.3%, 91.6% and 66.6% for the four groups respectively. While the duration of response (from treatment to oestrus appearance) was 7.43±1.56, 10.66±2.37, 8.44±2.41 and 67.63±9.87 in the 1 st ,2 nd ,3 rd and 4 th groups respectively, but the pregnancy rate recorded 90.9%, 80%, 81.8% and 83.3%. The statistical analysis showed that the 1 st and 3 rd group was recorded significant differences higher (p<0.01) than other groups (2 nd and 4 th ) related with responsive animal and the duration of response also but the pregnancy rate recorded higher significance (p<0.01) compared with 2 nd , 3rd and 4 th groups. The number of services /conception was more than 1.5-2.5 for all groups & not significant, the days open recorded higher significant (p<0.01) in 1 st , 2 nd and 3 rd compared with 4 th group (control group).

Clinical & therapeutical study on inactive ovaries in Holstein-Friesian cows by using GnRH analogues