Level of estradiol 17-β serum and ovarian folliculare dynamics in short estrous cycle of bali cattle

The aims of the research were to confirm the short estrous cycles and determine the blood level of estradiol 17-β and ovarian follicukar dynamics in these cases. the research was conducted using seven bali cattle,approximately 2 years of age,kept in healthy condition with normal estrous cycles. observation of estrus symptoms was performed daily. ovarian follicles was examined and measured using ultrasonography started at the estrus day. blood samples were collected from jugular vein,blood sample collection and ultrasonographical examination of the ovaries were performed daily in the same time. serum level of estradiol 17-β was performed using eia. the short cycle estrus were observed in 4 bali cattle (n=7) among natural estrous cycle. they have only one wave ovarian follicular development whereas the maximal size of ovarian follicles ovulation likes the normal cycle the duration of short estrous cycle was 7-10 days with normal usual estrus behavior. the peak of blood serum level was 107.77 ± 55.94 pg/ml when the diameter dominant follicle of short estrous cycle was reached 10.5 ± 0.38 mm. it can be concluded that the short estrous cycles may occur in bali cattle after puberty among normal cycles. © 2014 diponegoro university. all rights reserved.