Research on the development and therapy of persistent corpus luteum in cows

Abstract

Pathological puerperium can mainly cause significant economic damage through the high losses that accumulate throughout the herd and especially through the high percentage of sterility and infecundity. According to literature data, it is shown that this infertility ratio can range quite widely between 5.0-30.0% of the total bull herd. A criterion in the occurrence of this gynecological disease is the feed, which can vary in terms of quantity and quality, the farming regime to which the cows are subjected and not especially environmental factors (lack of body hygiene, low temperatures during the winter season and prolonged housing). In both research years, the incidence of cows diagnosed with persistent corpus luteum was high at 7.1% in 2021 and 9.9% in 2022 in the non-lactating cows group and after a period of 90 days after parturition. In 2021 the persistent luteal corpus luteum (CLP) in April did not register any cases, the most significant values were recorded in the months: October (1.9%), November (2.5%), December (3.5%) and the highest level of (3.9%) being reached in January. In 2022 the recorded values of persistent corpus luteum were close compared to the first year of investigation, peaking in January at 3.1%. According to the number of lactations, in 2021, 19.3% females, in 1st lactation only 1.5% were diagnosed with this gynecological condition. Also, the highest level of 4.4% was recorded in cows in their 6th lactation and above.