Improving Fertility in Friesian Cows by Synchronization of Fixed Time Insemination
Improving Fertility in Friesian Cows by Synchronization of Fixed Time Insemination
Mohamed A. Abu El-Hamd1*, Abdelslam M. Metwally2, Zahya R. Ghallab2, Wael A. El-Hamady1 and Mohamed A. El-karamany1
ABSTRACT
This study aimed to examine several hormonal treatments approaches for improving fertility in Friesian cows with high and low fertility. This study used a total of 40 Friesian cows, 20 of which were unable to conceive after a single service (high fertility), and 20 of which were unable to conceive after three services (low fertility). Animals were classified into four groups (n=10 /group) for two hormonal protocols. Cows in the first and second groups high or low-fertility (G1 and G2, respectively) were treated with PGF2α-GnRH protocol. Cows in the third and forth groups high or low-fertility (G3 and G4, respectively) were treated with OvSynch protocol. Results showed effective increasing oestrus responses 90, 70, 100 and 80% in G1, G2, G3 and G4, respectively. Pregnancy rate was significantly higher in G1 (80%) and G2 (60%) than in G3 (50% ) and G4 (40%) in cows. The concentration of progesterone (P4) significantly decreased in pregnant cows compared with non-pregnant in G2 and G3 at artificial insemination (AI), while it was higher at days 7, 14 and 24 post-AI in pregnant than in non-pregnant cows. At oestrus, the P4 concentration was significantly decreased in G1, G2, G3 and G4, in pregnant cow than in non-pregnant of high or low fertility. Economic analysis revealed that the PGF2-GnRH protocols were the least expensive (L.E. 65/animal), while the OvSynch treatment was the most expensive (L.E 95/animal).
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