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Effect of low dose oxytocin treatment on the pregnancy rate of the dairy cows

Author(s): H. Hamali, | S. Mosafery | M. Zargarzadeh

Journal: Research Opinions in Animal & Veterinary Sciences
ISSN 2221-1896

Volume: 1;
Issue: 2;
Start page: 126;
Date: 2011;
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Keywords: Pregnancy Rate | Cows | Oxytocin | Sperm

It is well known that during the natural mating, stimulation of the female genital system by the bull causes oxytocin release from the caudal part of the female pituitary gland and this hormone enhances the sperm transport in the genital tract. During the artificial insemination (A.I), this hormone dose not release perfectly. For determine of the oxytocin effect on the pregnancy rates of the cows, a total 100 cows were chosen in a dairy herd located in a suburb of Tabriz (North-west of Iran). These cows were randomly divided into two groups. In the group A, during the A.I, 30 IU oxytocin (3cc Vetocin) was injected to the cows intramuscularly. In the group of B, 3cc saline was injected intramuscularly to the control cows. After 45 days of A.I, all of the cows were examined by rectal palpation for pregnancy detection. The pregnancy rates were 58% and 54% in the groups of oxytocin treated and control respectively. The difference between two groups did not differ significantly. These results indicated that oxytocin administration during the A.I had not significant effect on the cow's pregnancy rates.
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