不同钙水平对蛋鸡蛋壳品质的影响

Effects of Different Levels of Calcium on Eggshell Quality of Laying Hens

研究了蛋鸡不同阶段饲喂不同水平钙对蛋壳品质的影响。结果表明，饲粮不同水平钙处理对产蛋率和采食量无影响；钙的阶段饲喂可以提高蛋比重；产蛋后期用40％的颗粒状钙代替粉末状钙源可以改善蛋壳品质；提高母鸡饲粮维生素D水平对蛋壳品质无影响；不同处理对钙的存留量和破。

An experiment was conducted to evaluate the Ca requirement of laying hens for optimum performance and shell quality from 19 to 82 wk of age. The at showed tha step- up Ca phase feeding can improve the egg specific gravity without affecting egg production and feed consumption. The presence of oyster shell had a beneficial effect on shell quality during phase 2 even when diets contained generous level of Ca. Dietary treatments did not affect the retention of Ca. Increasing the dietary level of cholecalciferol did not have any beneficial effects on shell quality.