Miller E R, Wilson H R, Harms R H
Poult Sci. 1977 Sep;56(5):1501-3. doi: 10.3382/ps.0561501.
An experiment was conducted to examine the serum calcium and phosphorus level of hens in relation to time of oviposition. Sixty-eight-week-old hens were selected for blood sampling according to the criteria that: 1. they laid an egg the day prior to and the day of blood collection, and 2. the oviposition time on both days was 10 a.m. +/- 2 hours. Samples were taken at hourly intervals, from five hours before through two hours after, and again at four hours after oviposition and were analyzed for serum calcium and phosphorus. All birds received natural and/or artificial light from 4:30 a.m. to 7:30 p.m. each day. Results indicated that serum phosphorus increased from 6.46 to 6.82 mg.% during the period from five to three hours prior to oviposition. Between three and two hours before time of lay, it dropped to a level of 4.75 mg.%, where it remained (+/- 0.35 mg.%) for the remainder of the test period. Serum calcium did not change appreciably during the 10-hour test period. It was hypothesized that the serum phosphorus cycle of the hens is composed of two segments of approximately six and 18 hours duration. The segments were delineated on the basis of activities of bone resoprtion and remineralization and egg shell formation.
进行了一项实验，以研究母鸡血清钙和磷水平与排卵时间的关系。根据以下标准选择68周龄的母鸡进行采血：1. 在采血前一天和采血当天产蛋；2. 这两天的排卵时间均为上午10点±2小时。每隔一小时取样一次，从排卵前5小时到排卵后2小时，再在排卵后4小时取样，并分析血清钙和磷。所有母鸡每天从凌晨4:30到晚上7:30接受自然和/或人工光照。结果表明，在排卵前5至3小时期间，血清磷从6.46毫克%增加到6.82毫克%。在产蛋前3至2小时之间，它降至4.75毫克%的水平，并在测试期的剩余时间内保持在该水平（±0.35毫克%）。在10小时的测试期内，血清钙没有明显变化。据推测，母鸡的血清磷循环由持续时间约为6小时和18小时的两个阶段组成。这些阶段是根据骨吸收和再矿化活动以及蛋壳形成来划分的。
