Effects of growth hormone injections on ovulation rate in ewes
| Autor: | SR Davis, PD Gluckman, JF Smith |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Ovulation
medicine.medical_specialty media_common.quotation_subject Reproductive technology Biology Endocrinology Animal science Human fertilization Estrus Lactation Internal medicine Genetics medicine Animals Bovine somatotropin Insulin-Like Growth Factor I Molecular Biology media_common Estrous cycle Sheep Endoscopy medicine.anatomical_structure Reproductive Medicine Growth Hormone Female Animal Science and Zoology Folliculogenesis Spermatogenesis Developmental Biology Biotechnology |
| Zdroj: | Reproduction, Fertility and Development. 2:173 |
| ISSN: | 1031-3613 |
| Popis: | Coopworth ewes were either treated with 5 mg recombinant-derived bovine growth hormone per day for each day of the oestrous cycle or were untreated. Ovulation rates at the pre-treatment, post-treatment and a subsequent oestrus were determined by endoscopy. These were 1.34, 1.51, 1.38 for the treated ewes and 1.32, 1.43, 1.39 for the control ewes. The ovulation rate post-treatment was significantly higher than for the other two cycles in the treated ewes but it was not significantly different from the post-treatment value of the control ewes. Plasma concentrations of insulin-like growth factor-I (IGF-I) were elevated during treatment (90-130 nmol L-1) compared with concentrations of 25-50 nmol L-1 in the control ewes. No relationship was found between plasma IGF-I concentration and ovulation rate. Injection of ewes grazing ryegrass/white clover pasture with bovine growth hormone did not result in increased ovulation rate. |
| Databáze: | OpenAIRE |
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