Evaluation of estrogen, insulin and some blood metabolites of dairy cows on the incidence of ovarian cysts in the Dasht Azar Negin farm

The purpose of this study was to evaluate concentrations of some metabolites and hormones and their effects on the incidence of ovarian cyst at postpartum in dairy cows. Blood samples were obtained from 93 dairy cows. The concentration of glucose, urea, total protein, phosphorus, zinc and beta-hydroxy butyric acid as well as estrogen and insulin hormones in blood serum were measured. The results revealed that the Zinc concentration in cystic primiparous cows was significantly lower than the control and cystic multiparous cows (P<0.05). Serum glucose concentration showed significant differences between cold and warm seasons (P<0.05). Phosphorus concentration in the warm season was higher than that of the cold season (P<0.05). Serum urea concentrations in control and cystic primiparous cows showed significant differences compared with serum urea concentrations of all multiparous cows (P<0.01). Beta-hydroxy butyrate concentrations of serum of cows with healthy low milk production were lower in comparison to cystic cows (P<0.05). Serum insulin concentrations had significant difference among the higher milk producing cystic cows compared to the higher milk producing normal cows (P<0.05). No significant differences were observed among the cows considering their serum concentrations of total protein and estrogen hormone. The results showed that the Zinc concentration, level of milk production and calving season affected the incidence of ovarian cyst significantly.