Multiple Insulin Injections to Improve Ovarian Activity and Pregnancy of Repeat Breeder Friesian Cows حقنات الأنسولين المتعددة لتحسين النشاط المبيضى والحمل فى الأبقار الفريزيان المتکررة التلقيح | ||||
Journal of Animal and Poultry Production | ||||
Article 1, Volume 11, Issue 10, October 2020, Page 375-381 PDF (872.31 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jappmu.2020.123610 | ||||
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Authors | ||||
W. F. Fouad ; W. A. El-Hamady; A. M. Shehab El-Din; M. A. El-Hennawy | ||||
Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt. | ||||
Abstract | ||||
This study aimed to evaluate the effect of exogenous multiple insulin injections on ovarian and estrus activity, and pregnancy rate in repeat breeder Friesian cows. Cows (n=12) in heat (Day 0) were divided into three groups. Cows were subcutaneous injected with 0.2 IU insulin/kg LBW on day 9 (G1), 8, 9 and 10 (G2), or 7, 8, 9, 10 and 11 (G3) of the normal estrous cycle. In G1, G2 and G3, cows were i.m. injected with 3 ml PGF2α on day 12. All treated cows in the next heat within 48-72 h post- PGF2α treatment were artificially inseminated with proven fertile semen. Based on overall mean, results showed that follicular number was the highest in G1 and the lowest in G3 (P<0.05). Follicular diameter was higher (P<0.05) in G3 than in G1. Largest follicles diameter was not affected. Diameter of CL was higher (P<0.05) in G2 and G3 than in G1. Serum P4 concentration was higher (P<0.05) in G2 and G3 than in G1. Serum P4 concentration was highest in G3. Pregnancy rate was higher (P<0.05) in G3 (75%,) than in G1 and G3 (50%). The administration of multiple injections of insulin at days 7, 8, 9, 10 and 11, followed by 3 ml PGF2α on day 12 from initiation of normal estrous cycle improved ovarian and estrous activity, and pregnancy rate of repeat breeders Friesian cows. | ||||
Keywords | ||||
Insulin; repeat breeder cows; follicular dynamic; progesterone; pregnancy rate | ||||
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