cosyntropin has been researched along with Follicular-Cyst* in 1 studies
1 other study(ies) available for cosyntropin and Follicular-Cyst
| Article | Year |
|---|---|
Preliminary investigations into the endocrine systems of subfertile cattle: location of a common lesion (rate-limiting step).
Dairy cows with a variety of clinical conditions were investigated in an attempt to identify the cause(s) of subfertility. Sequential or simultaneous injections of 20 micrograms gonadotrophin-releasing hormone (GnRH), 1 mg oestradiol benzoate and 0.06 mg ACTH(1-24) into five clinical cases of ovarian follicular cysts, two cases of poor body condition and one case of lameness and into control cows revealed a failure in the LH positive-feedback response to oestradiol in all eight clinical cases, but in only two out of twelve control cows. Two of the clinical cases and the two non-responding control cows had high or rising initial progesterone concentrations which would explain the absence of response. All cows studied responded similarly to GnRH and ACTH(1-24). It is suggested that hypothalamus-pituitary control of LH release may involve a rate-limiting step (in the oestradiol positive-feedback system) and that lesions at this point result in subfertility in a variety of clinical situations. Topics: Animals; Cattle; Cattle Diseases; Cosyntropin; Estradiol; Feedback; Female; Follicular Cyst; Infertility, Female; Luteinizing Hormone; Pituitary Hormone-Releasing Hormones | 1987 |