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

Abstract

This study was performed on 45 lactating Holstein – Friesian cows suffered from inactiveovaries for three months post partum and diagnosed clinically by rectal palpation in the form ofthe college of Agriculture / University of Baghdad , their ages 3-5 years during the period from2010-2012. These cows were divided randomly into 4 groups, 1st group (12 cows) were injectedwith 0.021mg (5 ml) Receptal I/M, 2nd group (12 cows) were given 500 μg (5ml) CystorelyinI/M, 3rd group (12 cows) injected with 0.5 mg (5 ml) Fertagil I/M in one dose and 4th group (9cows) 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 oestrusappearance) was 7.43±1.56, 10.66±2.37, 8.44±2.41 and 67.63±9.87 in the 1st ,2nd ,3rd and 4thgroups respectively, but the pregnancy rate recorded 90.9%, 80%, 81.8% and 83.3%. Thestatistical analysis showed that the 1st and 3rd group was recorded significant differences higher(p<0.01) than other groups (2nd and 4th) related with responsive animal and the duration ofresponse also but the pregnancy rate recorded higher significance (p<0.01) compared with 2nd,3rd and 4th 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 1st, 2nd and 3rd comparedwith 4th group (control group).