Ovarian cysts in 87 cows were treated with an intramuscular dose of 50 micrograms GnRH analog or 2500 IU HCG. Milk progesterone values were determined on day 0, 7 and 10 post-treatment. The cows were divided into three progesterone profile categories: I: low--rising progesterone, II: continually low progesterone, III: initially high progesterone. Fertility was restored about equally in groups I and III. Cows in group II came into heat quickly but conceived poorly. HCG and GnRH were equally effective in restoring the fertility. It was difficult to evaluate the progesterone status of the cow with rectal examination. Vaginoscopy seemed to be a somewhat more reliable method.

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Ovarian cysts in dairy cattle--observations of symptoms and milk progesterone values; therapy with GnRH and a combination of GnRH and PG.

Ovarian cysts of 59 cows were treated with an intramuscular dose of 50 micrograms GnRH analogue. Half of the cows were 9 days later further treated with 0.5 mg cloprostenol. The clinical symptoms were recorded. Whole milk progesterone was monitored on day of the treatment (GnRH) and on day 7. Most of the cows that had a high progesterone level showed no clinical symptoms of the ovarian cysts. The majority of the cows (50/59) had a low progesterone status (less than 10 nmol/l) at the time of the initial treatment. In only 7 cows the level had not risen by day 7. The cows of GnRH + PG group came into heat sooner (P less than 0.01) and conceived rather well; the treatment-conception interval was not, however, significantly shorter than in the GnRH group.

Animals↗