Delayed treatment with GnRH agonist,hCG and progesterone and reduced embryonic mortality in buffaloes |
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| Institution: | 1. Department of Cardiology, The Heart Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark;2. Department of Medicine, Nykøbing Falster Hospital, Nykøbing F, Denmark;3. Department of Health Science and Technology, Aalborg University, Aalborg, Denmark;4. Department of Internal Medicine, Division of Cardiovascular Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA;5. Department of Cardiology, Zealand University Hospital, Roskilde, Denmark;6. Section of Cardiology, Baylor College of Medicine, One Baylor Plaza, Houston, TX, USA;7. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark;8. Department of General and Interventional Cardiology, University Heart Center Hamburg, Eppendorf, Hamburg, Germany |
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| Abstract: | 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. 12 μg buserelin acetate; hCG (n = 33), i.m. 1500 IU hCG; P4 (n = 38), i.m. 341 mg 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 ± 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 P4 is beneficial to processes associated with embryonic implantation. |
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