Study on the performance of gonadotropin- releasing hormone (GnRH) in the puerperal period of beef cows

Abstract

The effect of the intravenous injection of 100 mcg (2 ml) gonadotropin-releasing hormone (Ovarelin, Ceva) from the 1st to the 20th day after calving of beef cows was monitored in the article, in regard to the occurrence of the first oestrus and the possibilities for its controlling. It was established that in the first minutes of intravenous application of Ovarelin the concentration of luteinizing hormone (LH) increased. By increasing the number of days increased the amount of secreted LH. Maximum effect of the injection of 100 mcg GnRH occurred between the 10th and 15th day. The physiological dose (100 mcg) GnRH injected intravenously on the 1st day after birth of cows led to increased content of LH in blood circulation.

Keywords

• puerperal period
• beef cows
• gonadotropin hormones