Abstract
The objective of the present study was to investigate the effects of post-mating treatments with gonadotropin-releasing hormone analogue (buserelin, GnRH) and equine chorionic gonadotropin (eCG) on ovarian functions, serum progesterone and pregnancy rates in Harri ewes. Ewes (n=58) were treated with 4μg buserelin (GnRH, n=30) and 500 IU eCG (eCG, n=28) 10 days post-mating. The eCG ewes had more CLs (57.1%) than GnRH ewes (33.3%) but diameters of new CLs were not different. The eCG ewes had more (P<0.01) serum P4 concentrations (8.1±0.79ng/ml) than the GnRH ewes (3.9±1.02ng/ml) at day 30 (during pregnancy). Similar trend was recorded at day 60 where serum P4 (8.5±0.79ng/ml) remained elevated (P<0.05) in the eCG compared to the GnRH ewes (6.0±0.79ng/ml) but not at day 90. Ewes treated with eCG had higher (P<0.05) pregnancy rate (46.43%, 13/28) than GnRH-treated ewes (20%, 6/30) at day 30. At day 60, there was a tendency (P=0.07) for the eCG ewes to have higher pregnancy rate (60.7%, 17/28) compared to GnRH ewes (36.7%, 11/30). Post-mating treatments with eCG improved the luteal functions and pregnancy rates compared to GnRH in Harri ewes raised under harsh climatic conditions in tropical regions.
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