肉用繁殖雌牛の分娩前後における血漿アラントイン濃度の変化

概要

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Three multiparous beef cows with twin fetuses and 3 cows with a single fetus were monitored for changes in plasma allantoin concentration from 8 and 24 weeks before parturition, respectively, until 14 weeks after parturition. The cows were given a diet which satisfied the nutrient requirements for maintenance. Nutrients required for pregnancy and lactation were added during the last 8 weeks of gestation and after parturition. The plasma allantoin concentrations in cows having a single fetus began to increase from 16 weeks before parturition despite the constant feed intake until 8 weeks before parturition. Although feed intake post-partum was 20 to 75% higher than in the prepartum period, plasma allantoin was lower in the post-partum period than in the prepartum period. The number of fetuses did not affect plasma allantoin concentrations. These results show that the plasma allantoin level is affected by not only rumen microbial protein production but also by the physiological conditions of the host animals.
社団法人日本畜産学会の論文