Roland D A, Harms R H
Poult Sci. 1976 Mar;55(2):637-41. doi: 10.3382/ps.0550637.
Six experiments were conducted to determine the influence of feeding diets containing different calcium-phosphorus (Ca:P)ratios at different times on the laying hen. Feeding a diet containing 0.75% P from 6 a.m. to 11 a.m. and a diet containing 1.50% P from 3 p.m. to 8 p.m. decreased serum calcium in three or four experiments and decreased specific gravity of eggs in four of four experiments, when compared to that of the birds fed the control diet which contained 0.75% P during both time periods. Specific gravity of eggs from hens fed a diet containing 0.75% P from 6 a.m. to 11 a.m. and a diet containing 0.33% P from 3 p.m. to 8 p.m. was increased in three of four experiments. Although the differences are not significant, with one exception, the trend in the experiments indicate that the level of P in the diet and time of intake can influence shell quality and serum calcium. The dietary treatments had no significant influence on feed consumption, egg production or egg weight during any of these experiments. It was postulated that the adverse or beneficial effect on specific gravity of eggs and serum calcium as a result of feeding diets containing various CaP ratios was due to the influence on calcium absorption and/or bone resorption.
进行了六项实验，以确定在不同时间饲喂不同钙磷（Ca:P）比例的日粮对蛋鸡的影响。与在两个时间段都饲喂含0.75%磷的对照日粮的鸡相比，在上午6点至11点饲喂含0.75%磷的日粮，下午3点至8点饲喂含1.50%磷的日粮，在三到四项实验中降低了血清钙，在四项实验中均降低了蛋的比重。在四项实验中的三项实验中，上午6点至11点饲喂含0.75%磷的日粮，下午3点至8点饲喂含0.33%磷的日粮的母鸡所产蛋的比重有所增加。尽管差异不显著，但除一个例外，实验趋势表明日粮中的磷水平和摄入时间会影响蛋壳质量和血清钙。在任何这些实验中，日粮处理对采食量、产蛋量或蛋重均无显著影响。据推测，饲喂含不同CaP比例的日粮对蛋的比重和血清钙产生的不利或有利影响是由于对钙吸收和/或骨吸收的影响。
