绵羊发情周期中水和电解质的排泄。

A R Michell
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引用次数: 11

摘要

在饲养的绵羊24个发情周期内观察电解质排泄,并在另外10个周期内观察混合唾液Na/K比值。1. 发情期食物和液体摄入量急剧下降,同时伴有钠排泄高峰,3天后以粪便和尿液形式转变为钠潴留高峰。2. 发情期钾排泄量随食物摄取量的增加而下降,但随后即使摄取量完全恢复,也无法恢复到发情期前的水平。3.奇怪的是,水的摄入量也完全恢复,而尿液和粪便的水潴留继续;在这些自由水分摄入的情况下,粪便损失实际上超过了肾脏排泄。4. 唾液、尿液和粪便Na/K的变化表明醛固酮峰值既不在黄体期也不在发情期,而是在3天后。这些数据提出了关于正常周期内水和电解质平衡调节的问题。它们也为研究性腺类固醇对肾脏的影响提供了基线。讨论了醛固酮、ADH和黄体酮在维持体液和电解质平衡中的可能作用,强调了物种面临的问题,这些物种已经进化为大量的强制性钾排泄,但钠和水的供应不可靠。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Water and electrolyte excretion during the oestrous cycle in sheep.

Electrolyte excretion was observed during 24 oestrous cycles in housed sheep, together with mixed salivary Na/K ratio during 10 additional cycles. 1. The sharp fall in food and fluid intake at oestrus accompanied a peak of sodium excretion which changed to peak retention 3 days later, both in faeces and urine. 2. Potassium excretion declined with food intake at oestrus but subsequently failed to recover to pre-oestrous levels dispite full recovery of dietary intake. 3. Curiously, water intake also recovered completely whereas urinary and faecal water retention continued; faecal loss actually exceeded renal excretion on these liberal water intakes. 4. Changes in salivary, urinary and faecal Na/K indicated an aldosterone peak neither during the luteal phase nor at oestrus but three days later. The data raise questions concerning the regulation of water and electrolyte balance within the normal cycle. They also provide a baseline for the investigation of renal effects of gonadal steroids. Possible roles for aldosterone, ADH and progesterone in maintaining fluid and electrolyte balance are discussed, emphasising problems confronting species which have evolved with heavy obligatory potassium excretion but undependable supplies of sodium and water.

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