Improvement of fertility in Egyptian buffaloes during summer season using different protocols for estrus synchronization [electronic resource].

Includes references.

This study aimed to determine the efficacy of different synchronizing protocols for improving the fertility in Water buffaloes. A total of 53 anestrous buffaloes (24 cows and 29 heifers) were used in this study through 2 experiments, during summer season. In experiment 1, 24 buffalo-cows were divided according to the treatment protocol into 4 groups:- G1 buffalo-cows (n=7) were given PGF2α followed 48 hrs later by injection of eCG; G2 buffalo-cows (n=6) were injected with PGF2α followed 48 hrs later by GnRH; G3 buffalo-cows (n=5) were injected with GnRH , followed 7 days later by PGF2α and G4 (control) buffalo-cows (n=6) did not receive any treatment. In experiment 2, 29 heifers were divided according to the treatment protocol into 3 groups: G1 heifers (n=10) were injected with GnRH followed 7 days later by PGF2α, and after 48 hrs injected with eCG; G2 heifers (n=11) were injected with GnRH, PGF2α and GnRH at 0, 7 and 9 days, respectively and G3 (control), in which heifers (n=8) did not receive any treatment. Animals were gynecologically examined, by trans-rectal ultrasonography (8 MHz) to detect the ovarian and genital tract condition. In experiment 1, the proportion of cows exhibiting estrus and the pregnancy rate after treatments were 85.75; 50% for G1, 67.0; 75% for G2 and 60; 66.6% for G3 compared to 16.7; 0% for control group. In experiment 2, the proportion of heifers exhibiting estrus and the pregnancy rate after treatments were 70; 42.8% for G1 and 63.6; 57.1% for G2 compared to 0% for control non treated group. It could be concluded that, during summer season, the use of PGF2α and GnRH protocol in buffalo-cows and GnRH, PGF2α, and eCG or GnRH, PGF2α, and GnRH protocol in heifers could successfully improve their fertility.

Summary in Arabic.

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