Effect of Different hCG Treatments on Fertility of Estrus-Induced and Artificially Inseminated Ewes During the Non-Breeding Season
| Autor: | Yutaka Fukui, Naohisa Ishida, Ryoko Itagaki, Midori Okada |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Estrous cycle
endocrine system medicine.medical_specialty Artificial insemination medicine.medical_treatment Domestic sheep reproduction Biology Insemination Human chorionic gonadotropin Animal science Endocrinology Controlled internal drug release medicine.anatomical_structure Internal medicine medicine Animal Science and Zoology Equine chorionic gonadotropin Corpus luteum |
| Zdroj: | Journal of Reproduction and Development. 47:189-195 |
| ISSN: | 1348-4400 0916-8818 |
| DOI: | 10.1262/jrd.47.189 |
| Popis: | The present study was conducted to determine the effect of two human chorionic gonadotropin (hCG) treatments on the fertility of ewes which were estrus-induced and artificially inseminated during the non-breeding season. Suffolk (SF: n=68) and South-Down (SD: n=20) ewes were pretreated with a controlled internal drug release dispenser (CIDR) for 12 days and 500 IU equine chorionic gonadotropin 1 day before CIDR removal. Each breed of ewes were divided into 3 groups: Group I (n=31), an intramuscular injection of 100 IU hCG was given on Days 3, 4 and 5 after artificial insemination (AI) (Day 0=the day of AI); Group II (n=29), an injection of 300 IU hCG was given on Day 4; and Group III (n=28, Control), an injection of 0.6% saline was given on Day 4. Plasma progesterone (P4) concentrations were measured by enzyme-immunoassay in all ewes in the three groups at the time of insemination (Day 0), and Days 4, 8, 12, 16, and 20 after AI. On Day 8, the mean P4 concentrations in ewes treated with hCG (Groups I and II) were significantly higher (P |
| Databáze: | OpenAIRE |
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