夏期分娩牛と冬期分娩牛の迅速ACTH負荷試験の結果について

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The effect on the adrenalcortical function by calving season in Holstein Friesian dairy cows was studied. The experiments were carried out from October, 1971 to January, 1973. Ten cows were selected from the dairy herds of Obihiro University of Agriculture & Veterinary Medicine, and were divided into two groups. The first group had 6 cows which calved from October to November (winter calving cows). The second group had 4 cows which calved from May to August (summer calving cows). All cows were given 40 I.U. synthetic ACTH intramuscularly at the following intervals : prepartum, partum, the 10th, the 30th and the 60th days postpartum. Prior to and 30 minutes after the injection of ACTH, 11-OHCS levels in the sera and blood cell counts were examined. The date obtained was analyzed by the chi-square test, and the breeding efficiency and milk yields through 90 days postpartum were discussed. Results obtained were as follow : (1) In both groups, 11-OHCS levels in the sera increased remarkably after the injection of ACTH prepartum, partum and at 60 days postpartum. No significant differences were found between the two groups. (2) On the 10th and the 30th days postpartum, there were increases in 11-OHCS levels in the sera of winter calving cows, but decreases in the sera of summer calving cows. These differences between the two groups were significant (P*0.05). (3) It was concluded that the adrenocortical function on the 10th days postpartum in summer calving cows was abnormal and that this abnormality was not influenced by milk production. (4) There was no significant variation in blood cell counts before and after the injection of ACTH. (5) No correlation was found between the adrenocortical function and breeding efficiency postpartum in dairy cows.
帯広畜産大学の論文
1974-12-25

夏期分娩牛と冬期分娩牛の迅速ACTH負荷試験の結果について

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