Abstract
The present study examined the effect of delayed treatment with tropic hormones and progesterone (P 4) on embryonic mortality in buffaloes. Buffaloes with a conceptus on Day 25 after AI were assigned to the following treatments: Control ( n = 41), i.m. physiological saline; GnRH agonist ( n = 36), i.m. 12 μg buserelin acetate; hCG ( n = 33), i.m. 1500 IU hCG; P 4 ( n = 38), i.m. 341 mg P 4 every 4 days on three occasions. Control buffaloes had an embryonic mortality of 41.4% (17/41) between Days 25 and 45, and this was reduced ( P < 0.01) by treatment with GnRH agonist (11.1%, 4/36), hCG (9.0%, 3/33) and P 4 (13.1%, 5/38). On Day 45, buffaloes treated with hCG and which ovulated had greater ( P < 0.05) concentrations of P 4 in whey (453 ± 41 pg/ml) than buffaloes in the same treatment that did not ovulate (297 ± 32 pg/ml). A similar but non-significant trend was observed for buffaloes treated with GnRH agonist. It was concluded from the findings that the treatment of buffaloes on Day 25 after AI with tropic hormones or P 4 is beneficial to processes associated with embryonic implantation.
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