In normal cows, the abomasum, located in the midline or right lower abdomen, twists to the left or right rib or to the right, causing symptoms such as lack of appetite, reduced milk production, and ketosis. Ruminants have four stomachs, the fourth of which functions similarly to the stomach of a monogastric animal. Cows that produce large amounts of milk meet their energy needs with large amounts of grain, and in this case the amount of low-molecular-weight fatty acids produced in the first stomach increases, which can result in the abomasum becoming relaxed and displaced. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
正常のウシでは正中あるいは右下腹部にある第四胃が左方または右膁(けん)(ひばら)部ないし右方で捻転することで,食欲不足,乳量の低下,ケトージスなどの症状を示す。反芻(はんすう)動物は四つの胃からなり,その第4番目の胃が単胃動物の胃と同様の働きをもっている。大量の泌乳をするウシではそのエネルギーの要求を大量の穀物で充当するが,その場合,第一胃で生産される低級脂肪酸が増加し,結果として第四胃は弛緩をきたして変位することがある。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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