Sarelius I H, Greenway R M
Pflugers Arch. 1975 Mar 26;355(3):243-59. doi: 10.1007/BF00583687.
The relative contribution of feed-induced and feed-independent changes to the pattern of electrolyte excretion have been determined in sheep maintained for extended schedules providing feeds at intervals of 24, 19, 4 and 1 hr. Power spectral analysis indicated that the pattern of electrolyte excretion was predominantly fixed by the feeding cycle. Frequent small feeds reduced the peak levels of excretion. However, feed-independent periodicities on hourly feeding regimes included a 24 hrs rhythm in urinary total solids, K, Cl and HCO3 and a 32 (or 64) hrs periodicity in a wide range of components. None of these occurred in all animals. It would appear that the sheep studied were not as closely influenced by normal 24 hrs environmental cycles as are human subjects. Furthermore, the sheep electrolyte rhythms were not correlated with the 24 hrs variation in adrenal steroid production.
在以24小时、19小时、4小时和1小时的间隔提供饲料的延长时间表下饲养的绵羊中，已确定饲料诱导变化和与饲料无关的变化对电解质排泄模式的相对贡献。功率谱分析表明，电解质排泄模式主要由喂食周期决定。频繁的少量喂食降低了排泄峰值水平。然而，每小时喂食方案中与饲料无关的周期性包括尿中总固体、钾、氯和碳酸氢根的24小时节律，以及多种成分的32（或64）小时周期性。并非所有动物都出现这些情况。看来，所研究的绵羊不像人类受试者那样受到正常24小时环境周期的密切影响。此外，绵羊的电解质节律与肾上腺类固醇分泌的24小时变化无关。
