Ovulation and Embryonic Survival in Pubertal Gilts Treated with Gonadotropin Releasing Hormone2
| Autor: | Anthony E. Archibong, Fredrick Stormshak, D. C. England |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Estrous cycle
endocrine system Fetus medicine.medical_specialty Chemistry medicine.drug_class medicine.medical_treatment media_common.quotation_subject Radioimmunoassay General Medicine Gonadotropin-releasing hormone Endocrinology Internal medicine Genetics medicine Animal Science and Zoology Gonadotropin Luteinizing hormone Saline Ovulation Food Science media_common |
| Zdroj: | Journal of Animal Science. 65:752-755 |
| ISSN: | 1525-3163 0021-8812 |
| Popis: | An experiment was conducted to evaluate the effect of exogenous gonadotropin releasing hormone (GnRH) on ovulation and embryonic survival in pubertal gilts. Gilts were assigned in replicates to a control (n = 10) and treatment (n = 10) group. Treatment consisted of an iv injection of 200 micrograms of GnRH immediately after initial mating on the first day of detected estrus. Control gilts were similarly injected with physiological saline. Blood samples were collected from the anterior vena cava immediately prior to injection, thereafter at 15-min intervals for 90 min, and subsequently, before slaughter on d 30 of gestation. Serum samples were analyzed for luteinizing hormone (LH) and progesterone by radioimmunoassay. Treatment with GnRH increased the quantity of LH released (P less than .05), with highest serum concentrations (ng/ml, means +/- SE) of gonadotropin in treated gilts (17.3 +/- 3.5) occurring at 75 min post-injection. In control gilts, serum concentrations of LH were not affected by injection of saline. Mean number of ovulations in treated gilts was also greater (P less than .05) than that of control animals (14.5 +/- .7 vs 12.1 +/- .6). However, treatment with GnRH did not enhance the number of attached conceptuses (normal and degenerating) present (treated, 10.9 +/- .9 vs control, 10.5 +/- .7) nor the percentage of viable fetuses (treated, 74.7 +/- 6.9 vs control, 83.5 +/- 5.0%) on d 30 of gestation. Although GnRH increased ovulation rate, mean weight of corpora lutea of treated and control gilts did not differ (402.8 +/- 16.3 vs 389.5 +/- 11.3 mg, respectively).(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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