Delayed treatment with GnRH agonist, hCG and progesterone and reduced embryonic mortality in buffaloes
2008
Campanile, G. | Vecchio, D. | Di Palo, R. | Neglia, G. | Gasparrini, B. | Prandi, A. | Zicarelli, L. | D'Occhio, M.J.
The present study examined the effect of delayed treatment with tropic hormones and progesterone (P₄) 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. 12μg buserelin acetate; hCG (n =33), i.m. 1500IU hCG; P₄ (n =38), i.m. 341mg P₄ 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 P₄ (13.1%, 5/38). On Day 45, buffaloes treated with hCG and which ovulated had greater (P <0.05) concentrations of P₄ in whey (453±41pg/ml) than buffaloes in the same treatment that did not ovulate (297±32pg/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 P₄ is beneficial to processes associated with embryonic implantation.
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