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- W2036696003 abstract "The objectives were to evaluate the concentrations of β-endorphin in peripheral circulation around parturition and to investigate their relationship to the concentrations of cortisol and postpartum resumption of pituitary and ovarian functions in dairy cows. Subjects were 21 Holstein-Friesian cows in late pregnancy. Blood samples were collected from these animals from day 270 in pregnancy until the first ovulation after calving. Average immunoreactive (IR) β-endorphin concentrations in cows with dystocia (n=8) in periparturient period (from day 270 of pregnancy until 24 h after calving) were slightly higher than those in cows with normal calving (n=13) in the same period although the difference was not significant. During the periparturient period, the peak level of IR β-endorphin was seen at the time of rupture in cows with normal calving and it was observed at the time of parturition in cows with dystocia. The trend of IR β-endorphin secretion appeared to be concomitant with cortisol secretion in the periparturient period but not in postpartum period (from 24 h after calving until the first ovulation). Average IR β-endorphin concentrations in cows with dystocia in the postpartum period were not significantly different from those in cows with normal calving. There was no significant association between average IR β-endorphin concentrations in early postpartum period (from 24 h until 7 days after calving) and the responsiveness of luteinising hormone (LH) to exogenous GnRH administered on day 7 postpartum. However, a negative correlation (r=−0.593; n=21; P=0.004) was observed between average IR β-endorphin concentrations and LH concentrations during the period from day 1 until the first ovulation in the 21 cows. In addition, a positive correlation (r=0.498; n=21; P=0.020) was seen between the β-endorphin concentrations and time to the first ovulation after calving. The results from this study suggest that β-endorphin may release into peripheral blood differently from cortisol and that it may be involved in regulating LH secretion and thus the resumption of ovarian cyclicity in postpartum dairy cows." @default.
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- W2036696003 date "1998-06-01" @default.
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- W2036696003 title "Plasma β-endorphin around parturition and its relationship to cortisol level and resumption of pituitary and ovarian functions in dairy cows" @default.
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- W2036696003 doi "https://doi.org/10.1016/s0378-4320(98)00086-4" @default.
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