Successful induction of oestrus, ovulation and pregnancy in adult ewes and ewe lambs out of the breeding season using a GnRH+progesterone oestrus synchronisation protocol
| Autor: | M. F. Martínez, B. Smaill, G. Tattersfield, Laurel D. Quirke, B. McLeod, J. L. Juengel |
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| Rok vydání: | 2015 |
| Předmět: |
medicine.medical_specialty
media_common.quotation_subject medicine.medical_treatment Oestrus synchronisation Gonadotropin-releasing hormone Biology Dinoprost Chorionic Gonadotropin Gonadotropin-Releasing Hormone Endocrinology Animal science Estrus Ovulation Induction Food Animals Pregnancy Internal medicine medicine Seasonal breeder Animals Equine chorionic gonadotropin Ovulation Progesterone media_common Estrous cycle Sheep General Medicine medicine.disease Female Animal Science and Zoology Ovulation induction Seasons Estrus Synchronization |
| Zdroj: | Animal Reproduction Science. 155:28-35 |
| ISSN: | 0378-4320 |
| DOI: | 10.1016/j.anireprosci.2015.01.010 |
| Popis: | A series of experiments was designed to assess the effect of a treatment protocol (U-synch) for inducing oestrus and ovulation out of the breeding season in adult ewes and ewe lambs. The protocol consisted of a 7-day treatment with an intravaginal progesterone-releasing device (IPRD), administration of GnRH at IPRD insertion on Day 0, and equine chorionic gonadotropin (eCG) and prostaglandin F2α at IPRD removal on Day 7. In Experiment 1, 50 or 100 μg GnRH were sufficient to induce ovulation at the beginning of the protocol in 3/9 and 4/9 ewes, respectively; while the resulting proportion of sheep ovulating after the treatment protocol was 88.9% and 77.8% in ewes initially treated with 50 or 100 μg GnRH, respectively. In Experiment 2, the proportion of Romney-cross ewe lambs ovulating was greater (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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