肉用牛における妊娠期の血漿中エストロンサルフェート濃度と胎子・胎盤機能との関係
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概要
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Plasma concentrations of estrone sulfate in different breeds of Japanese beef cattle and the relationship between those concentrations and feto-placental growth were examined in order to assess the possibility of monitoring abnormal growth of the fetus. Blood samples were obtained from cows from day 90 of gestation to parturition. The plasma concentration of estrone sulfate was measured by direct enzyme immunoassay. From day 180 of gestation, the mean concentration of estrone sulfate increased gradually and it was drastically elevated after day 240 of gestation with the maximum at day 285. Plasma concentrations of estrone sulfate on day 240 of gestation was significantly increased in F1 cows (Holstein Friesian and Japanese Black) compared with those in other breeds of cow. From day 270 to 278 of gestation, estrone sulfate concentrations of Holstein Friesian cows inseminated by Holstein Friesian differed from those inseminated by Japanese Black. In the cow with retained placenta, the plasma concentration of estrone sulfate reached plateau at day 240 of gestation and did not increase thereafter. There was no significant relationship between estrone sulfate concentration and duration of gestation, calf birth weight, weight of placenta or viability of newborn calves. These results indicate that changes of plasma estrone sulfate concentration in Japanese beef cattle are very similar to those in Holstein dairy cattle. They also suggest that the plasma concentration of estrone sulfate is associated with the breed of pregnant cow and that its concentration is also affected by calf birth weight depending on the breed of bull. It seems possible to predict the incidence of retained placenta but not the calf birth weight and viability of newborn calves in Japanese beef cattle.
著者
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磯部 直樹
広島大学大学院生物圏科学研究科
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磯部 直樹
Graduate School of Biosphere Science, Hiroshima University
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中尾 敏彦
Graduate School for International Development and Cooperation, Hiroshima University
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上原 理
Hiroshima University Farm, Faculty of Applied Biological Science, Hiroshima University
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YAMASHIRO Hidekazu
Hiroshima University Farm, Faculty of Applied Biological Science, Hiroshima University
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KUBOTA Hirokazu
Hiroshima University Farm, Faculty of Applied Biological Science, Hiroshima University
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中尾 敏彦
山口大学農学部
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Isobe Naoki
Graduate School Of Biosphere Sci. Hiroshima Univ. Jpn
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上原 理
生物生産学部附属農場
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Isobe Naoki
Graduate School For International Development And Cooperation Hiroshima University
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中尾 敏彦
山口大学 農学部獣医学科
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NAKAO Toshihiko
Graduate School for International Development and Cooperation, Hiroshima University
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Nakao Toshihiko
Graduate School For International Development And Cooperation Hiroshima University
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UEHARA Osamu
Hiroshima University Farm, Faculty of Applied Biological Science, Hiroshima University
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Kubota Hirokazu
Hiroshima University Experimental Farm
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Yamashiro Hidekazu
Hiroshima University Experimental Farm
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