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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 2000;13(7): 897-900.
DOI: https://doi.org/10.5713/ajas.2000.897    Published online July 1, 2000.
Effects of GnRH on the Plasma FSH, LH and Estradiol Levels at Estrus Induced with Injection of PGF2α and eCG in Prepubertal Buffaloes (Bubalus bubalis)
C. Singh, M. L. Madan
Abstract
The experiment was conducted to study the effect of GnRH administration at induced estrus on pituitary and ovarian response in buffalo heifers. Eight Murrah river buffaloes of 12 to 13 months of age were treated with PGF2慣 and eCG combination. GnRH (Fertagyl) 200 ug was injected (iv) at estrus in four heifers (treated group) while saline (2 ml, iv) was injected in remaining four heifers (control group). Blood was collected through jugular catheter to estimate plasma FSH, LH and estradiol level. The pretreatment plasma FSH, LH and estradiol values ranged from 8.46 1.97 ng/ml to 12.31 1.30 ng/ml, 0.87 0.21 ng/ml to 1.19 0.29 ng/ml and 19.09 2.38 pg/ml to 20.24 1.00 pg/ml respectively. The plasma estradiol concentration elevated significantly (p<0.05) within 24 hr after eCG administration and reached its peak levels of 154.09 17.28 pg/ml and 181.95 31.82 pg/ml at estrus in respectively treatment and control groups. The plasma FSH and LH concentrations did not increase during follicular development after eCG administration while initial significant (p<0.05) increases in both plasma FSH and LH concentrations occured within 5 and 10 min, reaching peak levels of respectively 110.06 23.56 ng/ml and 13.15 3.13 ng/ml within 90 min after GnRH injection was detected. A sharp and significant decline in plasma estradiol concentration (59.27 8.78 pg/ml) associated with synchronized ovulation within 24 hours after GnRH injection was recorded. The observation suggest that the hypophysis of prepubertal buffaloes treated with eCG have gonadotrophins awaiting the releasing factor to evoke release of gonadotrophin during the follicular phase to induce synchronized ovulation.
Keywords: Superovulation; GnRH; Gonadotrophins; Estradiol; Buffalo Heifers
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