Changes in Concentration and Composition of Serum Free Fatty Acid in Normal and Ketotic Cows before and after Calving

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  • 正常およびケトーシス発症乳牛の分娩前後における血中遊離脂肪酸ならびにその組成の変動
  • セイジョウ オヨビ ケトーシス ハッショウ ニュウギュウ ノ ブンベン ゼンゴ

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Abstract

The concentration and composition of serum free fatty acids (FFA) were examined in normal and ketotic dairy cows during 8 weeks before and after calving. In the normal cows, FFA showed a rapid increase in concentration at calving and a decrease after calving. Gas chromatography analysis demonstrated reversed phase changes of some serum fatty acids. Palmitic acid (C16: 0) and oleic acid (C18: 1) increased at calving and then decreased. Linoleic acid (C18: 2) showed a marked decrease in relative ratio before calving. It increased to be a maximum component at 8 weeks after calving. The ketotic cows showed a greater increase in FFA concentration than the normal cows at calving, maintaining a high level of FFA after calving. They presented a much lower linoleic acid concentration at calving than the normal cows and a low rate of increase in this concentration after calving.

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