夏季，温度升高，蛋鸡由于应激反应，蛋壳品质会下降会，这样的情况，我们首先考虑到钙的蛋鸡体内存留时间对蛋壳质量的影响，在日粮钙含量达到理论标准时，还必须保证钙质饲料的颗粒度(8~12 目为好)，使之适宜于鸡吸收利用。
实验证明:采用含钙3.5%~4%的全粉料日粮，鸡食后钙在体内存留量仅为50%。由于蛋壳一般是黄昏时开始沉积，这样鸡在夜间根本得不到足够的钙质补充，这就是为什么长时间饲喂全粉料日粮时，蛋壳质量普遍较差的原因。可采用下午3时以后补充占日粮1%~1.5%的钙粉粒加以克服。
当然钙只能起到一部分左右，更重要的是要在蛋鸡饲料中添加能够从过根本上解决蛋壳质量问题的中草药来调节。
主要功能：
第一：提高蛋壳质量，改善蛋壳颜色，七天见效，十天左右效果稳定下来。
第二： 补充蛋壳腺素，有效恢复和改善成正常的蛋壳色泽，使蛋壳颜色色度均匀。
第三： 提高蛋壳品质，减少薄壳蛋，沙壳蛋、破裂、暗裂及其它的蛋壳缺陷。使壳的硬度增加。
第四： 有效形成蛋壳保护的屏障，减少杂菌的污染，延长商品蛋存放时间，增加蛋的受众率。
第五： 增强免疫能力，平衡电解质，调整机体的内分泌，促进生长的发育，提高了饲料利用率
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The egg rate is marked on the drawing and will be linked together to get the egg curve of the chicken group. The egg-laying rate of the first egg was low - high - low in the egg curve.
Pre-egg production is the period from the beginning of the egg to the peak of the egg production (21-26 weeks). The number of eggs rose rapidly during this period, increasing by 12% to 20% a week, while chicken weight and egg weight increased. Weight increased by 4-5 grams per day, and egg weight increased by 1 gram per week.
Egg production at the peak of the egg production is usually over 85 percent, and the average egg rate of 28 weeks is up to 90 percent. Normally, the peak season can last 3-4 months. During this time, the egg change is small and the weight gain slightly.
At the end of the egg production, the egg rate gradually declined, dropping by about 0.5% a week, and the egg was heavier and heavier. The rate of egg production dropped to 65 to 70 percent in 72 weeks.
