広島大学水畜産学部紀要 16巻 2号
1977-12-25 発行

御幸牧場において集団発生した「低酸度二等乳」に関する研究 : III. 1970年10月より1971年9月における血液像の記録とその期間に陶汰された乳牛の骨について

Studies on ‘the Utrecht Abnormality of Milk' in the Miyuki Dairy Farm : III. The blood values from Oct. 1970 to Sept. 1971 and the photographs of jawbone
吉田 繁
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抄録
A great deal of abnormal milk secretion called 'the Utrecht abnormality of milk' had been observed in the Miyuki Dairy Farm located in Fukuyama city, Hiroshima, Japan, at the summer season of 1970. The particular characteristics on this abnormal phenomenon was not only alcohol-test positive and heating-test positive milk secretion from all lactating dairy cows in that farm but also milk and blood samples of that dairy herd showed some unbalanced data.

The milk showed high Ca and low Mg, i.e., the ratio of Ca (meq) / Mg (meq) was 6.92 for miyuki Dairy Cows and 5.48 - 5.98 for normal group.1) The whole blood samples in the case of Miyuki Dairy Cows showed high Ca and normal Mg levels, and it's blood serum samples showed high Ca and low Mg level.2) From these results, the cows of Miyuki Dairy Farm must have been suffering from some metabolic disorders resulting in an abnormal out-flow of Ca from bone into milk and the saving of Mg secretion from body into milk.

The present paper describes the results of the monthly changes of various blood data from Oct. 1970 to Sep. 1971, and the photographs of bone samples. Seven cows were slaughtered and their jawbones were collected. All of them showed 'osteoporosis' as shown in Plates. The demineralization, especially Ca outflow, from bone resulted in the osteoporosis on the cows and the excretion of Ca into milk brought on the phenomenon of 'the Utrecht abnormality of milk'. This abnormal movement of Ca must be caused by a chronic disturbance of Mg metabolism or a shortage of Mg intake.