Maintenance of Pregnancy in Repeat Breeder Dairy Cows by CIDR Administration After Breeding


	Pakistan Journal of Biological Sciences
	Year: 2007 \| Volume: 10 \| Issue: 14 \| Page No.: 2402-2406 DOI: 10.3923/pjbs.2007.2402.2406

Maintenance of Pregnancy in Repeat Breeder Dairy Cows by CIDR Administration After Breeding

H. Ghasemzadeh-Nava, H. Kohsari and P. Tajik

Abstract: The aim of this study was to assess the effect of two periods of P₄therapy by CIDR on the 1st service Conception Rate (CR) of repeat breeder dairy cows. The cows were selected on the following basis: absence of dystocia, retained placenta and endometritis after the last parturition. They were inseminated according to the AM/PM rule relative to estrus onset and randomly assigned into 3 groups: (A) CIDR on day 5 after insemination that was removed on day 9 of the cycle (n = 40); (B) CIDR on day 5 after insemination that was removed on day 19 of the cycle (n = 36) and (C) untreated controls (n = 40). Pregnancy diagnosis was conducted by rectal palpation 45-55 days after AI in cows not observed in estrus. The difference in CR among the groups was analyzed by chi square analysis. The CR in groups A, B and C was 55, 41.7 and 30%, respectively and was greater (p<0.05) in treatment (A) cows than in control cows. In conclusion, repeat breeder cows in groups A and B benefited from progesterone supplementation, but significant effects of treatment for improvement of conception rate was seen in short treatment period (4 days treatment).

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How to cite this article:

H. Ghasemzadeh-Nava, H. Kohsari and P. Tajik, 2007. Maintenance of Pregnancy in Repeat Breeder Dairy Cows by CIDR Administration After Breeding. Pakistan Journal of Biological Sciences, 10: 2402-2406.

DOI: 10.3923/pjbs.2007.2402.2406

URL: https://scialert.net/abstract/?doi=pjbs.2007.2402.2406

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