Comparison of Three Therapeutic Methods of Cystic Ovaries in Holstein Cows

摘要

Cystic ovarian degeneration (COD) is considered one of the most important causes of reproductive failure in cattle. The economic loss to dairy industry is severe, because COD increases both days-open and culling rates. The disease process is a consequence of a mature follicle that fails to ovulate at the appointed time of ovulation in the estrous cycle. This anovulatory follicular structure either regresses or persists as a follicular or luteal cyst, depending upon its structural/functional characteristics. Hormonal preparations that release luteinizing hormone from the anterior pituitary or have luteinizing hormone-like action are used to treat follicular cysts. GnRH belongs to the former group and human chorionic gonadotrophin (hCG) hormone is inthe latter group.