实验材料:白落克与考尼斯杂种,成鸡、具产卵能力的、体格健壮无病的种鸡。实验方法:设实验组(喂“七○七一”)和对照组(不喂“七○七一”),每组产卵鸡各200只。在相同条件下分群饲养。“七○七一”按下列配方配成“多蛋素”:磷酸氢钙20%、贝壳粉50%,骨粉30%、以0.2%的“681”饮水代替微量元素。 Experimental Materials: White Lark and Corus hybrids, into chickens, with egg-laying ability, robust body disease-free breeders. Experimental methods: experimental group (fed “7079”) and control group (not fed “7079”), each group of 200 laying hens. Group feeding in the same conditions. “7071” according to the following formula dubbed “polyethelin”: dicalcium phosphate 20%, 50% shell powder, bone meal 30%, with 0.2% of the “681” drinking water instead of trace elements.