Investigation of Estradiol 17-β, Progesterone and BUN in Primiparous and Multiparous Holstein Dairy Cows with Ovarian Cysts

Ovarian cysts are follicle-like structures with 2. 5 cm in diameter that persist at least for 10 days on one or both ovaries in the absence of corpus luteum. In order to investigation of estradiol 17-β، progesterone and blood urea nitrogen in cystic cows، 30 lactating Holstein cows (15 cystic and 15 normal cows) were used. Estradiol 17-β and progesterone were measured by chemilominecense method and blood urea nitrogen was measured using spectrophotometer. The results showed that the concentrations of estradiol 17-β and blood urea nitrogen (BUN) in cystic cows were significantly higher (P<0. 05) and glucose levels lower than the normal cows (P<0. 05). Milk yield had significantly effect on BUN levels (P<0. 05). The levels of estradiol 17-β in multiparous cystic cows were significantly higher than primiparous and multifarious normal cows (P<0. 05). Although mean of progesterone concentrations was lower in control group than cystic cows، there was no significantly difference between those groups (P=0. 06). This study showed that increasing of concentration of estradiol 17-β and blood urea nitrogen and decreasing blood progesterone can be used as sign of cystic ovaries in cow.