Toxic effects of diatery zinc for induction Of resting on laying hens

This investigation was carried out in poultry farm at Abo-Hammed, Sharkia Governorate. The present study was designed to study the effect of zinc oxide used in force molting and its effects on some productive traits traits and toxic effects on laying hensThe hens were equal divided into three groups.*The first group of hens was used.*The 2nd group of hens was fed