Palafox A L, Ho-A E
Poult Sci. 1980 Sep;59(9):2024-8. doi: 10.3382/ps.0592024.
Two experiments involving 124 Single Comb White Leghorn (Hy-Line) laying pullets and hens were conducted to determine the effect of zinc toxicity on bird performance. Twenty milligrams of zinc per gram of diet fed for 5 days significantly lowered fertility and hatchability of pullet eggs collected 14 to 28 days after the 5-day zinc feeding period. Zinc significantly depressed body weight on the day 5 of zinc feeding and significantly lowered egg poroduction from 0 to 4 weeks of test. Egg production from 4 to 12 weeks, feed conversion from 0 to 12 weeks, final body weight, and livability were not significantly affected. Hens fed the supplemental zinc for five days had depressed egg production from 0 to 4 weeks. Egg production from 4 to 12 weeks, feed conversion, final body weight, and livability were not significantly affected. Compared to their respective controls, 2% supplemental zinc fed for 5 days significantly improved hen but not pullet egg weight. Hen eggs collected 28 days after hens received the zinc diet contained significantly less potassium, copper, and zinc than the controls.
进行了两项涉及124只单冠白来航（海兰）产蛋母鸡和蛋鸡的实验，以确定锌中毒对禽类生产性能的影响。在为期5天的锌饲喂期后，每克日粮中添加20毫克锌并持续饲喂5天，显著降低了在第14至28天收集的小母鸡鸡蛋的受精率和孵化率。锌在饲喂锌的第5天显著降低了体重，并在0至4周的试验期内显著降低了产蛋量。4至12周的产蛋量、0至12周的饲料转化率、最终体重和存活率均未受到显著影响。饲喂补充锌5天的母鸡在0至4周的产蛋量有所下降。4至12周的产蛋量、饲料转化率、最终体重和存活率均未受到显著影响。与各自的对照组相比，饲喂5天2%的补充锌显著提高了母鸡的蛋重，但未提高小母鸡的蛋重。母鸡接受锌日粮28天后收集的鸡蛋中，钾、铜和锌的含量明显低于对照组。
