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• W2064462612 abstract "The peripheral blood plasma levels of LH, oestradiol-17β and progesterone were recorded during the second and fourth pro-oestrous—oestrous periods in six crossbred (Swedish Landrace X Swedish Yorkshire) gilts. The relationships between hormonal levels, external heat signs and ovarian function were studied. Blood samples were taken every third hour during the pro-oestrous—oestrous periods and during this time the heat detection was performed when blood was collected, otherwise twice daily. The ovaries were inspected by laparoscopy after the first, second and fourth oestrus. The gilts were slaughtered after the fifth oestrus and the genital organs examined. In the five gilts showing five successive regular heats the duration of the second pro-oestrus (reddening and swelling of the vulva) was significantly longer (56.4 ± 5.3 h) than that of the fourth (23.4 ± 6.3 h). The oestrus (standing reflex) duration did not differ, being 51.6 ± 5.4 h for the second and 52.2 ± 9.3 h for the fourth oestrus. The mean oestradiol-17β level was significantly increased during the fourth pro-oestrous—oestrous period (43.9 ± 0.75 pmol) as compared to the second (37.8 ± 0.73 pmol). The LH level was also significantly higher during the fourth (1.61 ± 0.08 μg/l) than during the second pro-oestrous—oestrous period (1.25 ± 0.08 μg/l). There was, however, no difference in the duration of elevated oestradiol levels (> 30 pmol/l). In spite of the higher oestradiol-17β levels, the duration of the external heat signs was reduced during the fourth pro-oestrus when compared to the second. This phenomenon might be explained by a change in susceptibility of vulvar hormonal receptor mechanisms. The sixth gilt displayed three normal heats, but failed to show standing reflex and to ovulate thereafter. The hormonal patterns were normal during the second pro-oestrous—oestrous period. At the expected fourth heat there was a rise of oestradiol but no preovulatory LH peak occurred." @default.
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• W2064462612 date "1984-01-01" @default.
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• W2064462612 title "Endocrine pattern and external oestrous symptoms at second and fourth oestrus in gilts" @default.
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• W2064462612 doi "https://doi.org/10.1016/0378-4320(84)90008-3" @default.
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