Влияние на овариалната активност върху електрическото съпротивление на влагалището при кучката по време на проеструс и еструс
2014
Antonov A. | Dineva J. | Georgiev P.
The aim of this study was to determine the relationship between the values of vaginal electrical resistance during proestrus and oestrus, ovulation and the levels of ovarian hormones estradiol-17β and progesterone in the bitch. Sixteen bitches from different breeds and age were included in this investigation. Vaginal electrical resistance of each bitch was measured once daily, starting from the first day of vulval bleeding and continuing until the first day of cytological diestrus. In each bitch vaginal smears were taken to determine the onset of estrus and diestrus and bloodsamples were taken to determine serum progesterone (ng/ml) and estradiol-17β (pg/ml) for detection of the onset of ovulation and their influence on values and the dynamics of vaginal impedance. The concentrations of estradiol-17β reached their top values between 5th and 9th day (7.5±1.15 days) from the onset of proestrus and were determined always 2-5 days (3.56±0.81 days) before ovulation, which was detected between 9th and 13th day (11.06±1.24 day) from the first day of vulval bleeding. At the first day of estrus progesterone values ranged from 2.64 to 4.37 ng/ml, reaching levels between 31.62 and 33.90 ng/ml at the beginning of diestrus. It was also found, that vaginal electrical resistance in the bitch increases during proestrus and early estrus. In 14 (87.5%) of bitches significant peak values (р
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