Comparison of two progestogens during out-of-season breeding in a commercial ewe flock
| Autor: | E.M. Parsons, R.T. Duby, D.J. Giordano, J.P. Tritschler, M.J. Parsons |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
endocrine system
medicine.medical_specialty animal diseases medicine.medical_treatment Pregnant Mare Serum Gonadotropin chemistry.chemical_compound Animal science Food Animals Internal medicine medicine Medroxyprogesterone acetate Small Animals reproductive and urinary physiology Estrous cycle Progestogen Equine business.industry Domestic sheep reproduction Norgestomet Pregnancy rate Endocrinology chemistry Animal Science and Zoology Flock business hormones hormone substitutes and hormone antagonists medicine.drug |
| Zdroj: | Theriogenology. 35:943-952 |
| ISSN: | 0093-691X |
| DOI: | 10.1016/0093-691x(91)90305-w |
| Popis: | A comparison was made of the relative effectiveness of subcutaneous ear implants containing 2 mg Norgestomet or vagnial pessaries containing 60 mg medroxyprogesterone acetate (MAP) to induce estrus and conception in dry anestrous ewes. Groups of ewes were treated with one of the two progestogens for 14 d, and 500 IU pregnant mare serum gonadotropin (PMSG) was administered intramuscularly at the time of progestogen withdrawal. No significant differences in estrus induction, pregnancy rate or number of lambs born per ewe lambing were observed. Ewes treated with Norgestomet had 96% estrus, 60% pregnancy rate and 1.4 lambs per ewe lambing. Comparably, ewes treated with MAP had 94% estrus, 65% pregnancy rate and 1.7 lambs per ewe lambing. Norgestomet implants compared favorably with MAP pessaries for estrus induction and breeding of commercial, dry anestrous ewes. |
| Databáze: | OpenAIRE |
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