EN
The investigations were carried out on 75 infertile cows with cystic ovarian disease, and 25 control cows with corpus luteum. The blood concentrations of ketone bodies, free fatty acids, glucose, total cholesterol and progesterone were determined before cyst treatment with GnRH. Levels of ketone bodies and free fatty acids were higher and progesterone level was lower in cystic cows than in control ones. Pregnancy rate to 60 days was 54.6% after injection of GnRH. The low progesterone level and energy deficit negatively influenced the efficacy of ovarian cyst treatment with GnRH.