Studies on 'the Utrecht Abnormality of Milk' in the Miyuki Dairy Farm : II. Ca and Mg Contents in Blood

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 : (2) 低酸度二等乳泌乳牛の血中Ca及びMgについて

Yoshida Shigeru

広島大学水畜産学部紀要

Journal of the Faculty of Fisheries and Animal Husbandry, Hiroshima University

1970年に御幸牧場で集団発生した低酸度二等乳はアルコール試験陽性でまた熱凝固性を示し,これは'the Utrecht abnormality of milk'と同じ特微を示した。そしてまたその異常乳はCaが高くMgが低いこととイオン状Caが高い値を示した。

御幸牧場の乳牛の血清Caが高く血清Mgが低いことと全血Caが高いと云う特微がみられた。尚,全血Mgには差がみられなかった。

表　御幸牧場の乳牛群と対称牛群の血中のMg及びCaについて (単位meq/l)
御幸牧場の乳牛群の平均値: 頭数 17, 全血中のCa 3.82, 全血中のMg 1.82, 血清中のCa 4.49, 血清中のMg 1.82
対象群の平均値: 頭数 54, 全血中のCa 3.34, 全血中のMg 1.85, 血清中のCa 4.24, 血清中のMg 2.00

以上の結果から,御幸牧場の乳牛群の血清Caが高い。血清Mgが低いと云う特微とが密接に関係していると考えられる。乳牛の血清Mgが低くく血清Caが高いと云う特微はその乳牛群がMgの代謝異常かMg欠乏をともなった慢性的な泌乳障害におち入っているにちがいないと推定される。

A great deal of abnormal milk secretion has been observed in the Miyuki Dairy Farm, and the abnormal milk showed alcohol test positive and heating test positive properties that are called 'the Utrecht abnormality of milk.' The abnormal milk showed high Ca and low Mg content in its skim milk and had a high ionized Ca level.

The cows in the Miyuki Dairy Farm showed a low Mg content and a high Ca content in the blood serum, and a high Ca level in the whole blood compared with that of normal groups.
1) The mean value in the blood serum of Mg is 1.82meq/l for abnormal groups and 2.00meq/l for normal ones.
2) The mean value in the blood serum of Ca is 4.49meq/l for abnormal and 4.24meq/l for normal ones.
3) The mean value in the whole blood of Mg is 1.82meq/l for abnormal and 1.85meq/l for normal groups.
4) The mean value in the whole blood of Ca is 3.82meq/l for abnormal and 3.34meq/l for normal groups.

From these results, the abnormal milk in the Miyuki Dairy Farm which showed a low Mg and a high Ca content must have been yielded from cows suffering from a low Mg and a high Ca content in their blood serum. From low serum Mg and high serum Ca, the author has arrived at the conclusion that the lactating dairy cows in the Miyuki Dairy Farm must have been suffering from chronic lactation disorder accompanied by a disturbance of the Mg metabolism or by a Mg deficiency.

Animal husbandry [ 640 ]

eng

広島大学水畜産学部

[ISSN] 0440-8756

[NCID] AN00213563

[NAID] 40003288819