求翻译：安全性 针对各阶段蛋鸡生理及饲养管理特点，适时适量使用无公害药物，以营养促保健，对环境和禽产品不产生残留污染。是什么意思？

Security for the various stages of physiological characteristics and feeding management of layer, moderate use of pollution-free drugs in a timely manner, to nutrition and promote health, the environmental pollution and do not produce residues in poultry products.