Thompson G, Faulkner A
Hannah Research Institute, Ayr, UK.
J Dairy Res. 1990 Feb;57(1):1-5. doi: 10.1017/s0022029900026546.
Six Friesian cows were milked daily, and arterial and mammary venous blood samples were taken between day 266 of gestation and day 6 after parturition. Samples of blood plasma were analysed for their content of acetate and progesterone, and mammary secretion for potassium, isocitrate, 2-oxoglutarate and triglyceride fatty acids. The onset of secretion of medium-chain triglyceride fatty acids was preceded by, or coincided with, increases of potassium and isocitrate concentration in the secretion. The onset of fatty acid secretion was not accompanied by any change in the gland's extraction of acetate from the circulation, and did not occur at a consistent time relative to parturition or changes in plasma progesterone concentration.
每天对6头弗里斯兰奶牛进行挤奶，并在妊娠第266天至分娩后第6天采集动脉血和乳腺静脉血样本。分析血浆样本中的乙酸盐和孕酮含量，以及乳腺分泌物中的钾、异柠檬酸、2-氧代戊二酸和甘油三酯脂肪酸含量。中链甘油三酯脂肪酸分泌开始之前或与之同时，分泌物中的钾和异柠檬酸浓度会升高。脂肪酸分泌开始时，腺体从循环中摄取乙酸盐的量没有任何变化，并且相对于分娩或血浆孕酮浓度的变化，其发生时间并不一致。
