Sattler N, Fecteau G, Couture Y, Tremblay A
Clinique Vétérinaire St-Vallier, 400, montée de la Station, St-Vallier, Québec.
Can Vet J. 2001 Feb;42(2):107-15.
The objectives of this study were to evaluate a method of determining the internal and external potassium balances in dairy cows and to determine daily and lactation period-associated variations of these balances. Ingested potassium, milk potassium concentration (LK) and potassium urinary fractional clearance (FeK) defined the potassium external balance. Serum (SK) and red blood cell (CIEK) potassium concentrations defined the potassium internal balance. Whole blood, urine, and milk were collected at different times of the day from 19 cows, grouped in 5 lactation periods. Significant differences were observed for LK between lactation periods. Significant variations occurred during the day for CIEK, LK, and FeK. Thus, in order to monitor potassium balances during a time period, samples should be collected at the same time each day. This method of determining both potassium balances simultaneously could be useful in the study of the bovine hypokalemia syndrome.
本研究的目的是评估一种测定奶牛体内外钾平衡的方法，并确定这些平衡的每日及泌乳期相关变化。摄入的钾、牛奶中的钾浓度（LK）和钾的尿分数清除率（FeK）定义了钾的外部平衡。血清（SK）和红细胞（CIEK）中的钾浓度定义了钾的内部平衡。从19头奶牛身上，在一天中的不同时间采集全血、尿液和牛奶，这些奶牛分为5个泌乳期。泌乳期之间LK存在显著差异。CIEK、LK和FeK在一天中出现显著变化。因此，为了在一段时间内监测钾平衡，应在每天的同一时间采集样本。这种同时测定两种钾平衡的方法可能对牛低钾血症综合征的研究有用。
