European Journal of Zoological Research
Abstract
Author(s): Vahid Khodabandehloo, Salim Mobasher Shokorloo, Fardin Bodaghi, Mohammad
Reza Marsouli Oshtolagh and Navid Neisari Tabrizi
Reproduction is one of the most important issues in the dairy farms. So, there are some standards to reach the ideal
production. In this survey we aimed to evaluate the combined treatment method of ?¢????CIDR+ heat synch?¢??? in the dairy
anoestrus cows. In present study, which carried out in a dairy farm, we selected 150 anestrous cows that had same
body condition. Then, cows were divided into the 3 groups of 50. Cows of group1 received 5ml gonadorolin. Cows
of group 2 received CIDR on day 0; CIDR was removed on day7 and after 24-hours received 0.5ml estradiol
benzoate. Cows of group3 received CIDR on day 0 concomitant with 5ml gonadorolin, 7days later, CIDR was
removed and were received 3ml prostaglandin at the same time and after 24 hours were received 0.5ml estradiol. At
the end, whole cows were underwent artificial insemination. Finally, conception and pregnancy rate were recorded
and analysed statistically. Results showed that the fertility rate was 44.44%, 35.7% and 40.9% in group1, 2 and 3,
respectively. Statistical analysis showed that there was significant difference between groups1 and 2 also between
groups1 and 3 (p<0.01) from estrous point of view. From fertility rate aspect, there was no significant difference
between groups. Our results showed that estrous rate was better in CIDR than gonadorolin, but there was no
difference between these methods fertility rate. Thus, we can conclude that use of CIDR is better than gonadorolin.
