التأثيرات السمية لفتامين A على فروج دجاج اللحم في طور النمو

الملخص EN

This study was performed to evaluate the toxic effect of hyper vitaminosis A on the biological and metabolic parameters of broiler young chicken.

The results of the present study indicated an adverse effect of hypervitaminosis A on the growing broiler.

Clinical signs represented by skeletal abnormalities, swelling of the knee joint, lameness, increased bone fragility, ascitis, edema, macro and micro lesions of the examined organs (especially liver, kidney and bone).

Bone fragility test showed increase in long bone thickness and increased fragility positively according to dose.

The toxic effect of vitamin A on bone marrow was obvious as the histopathological exam appeared replacement of red marrow with fatty tissue.

Histopathological exam revealed lesions in the examined tissues (such as liver, kidney, bone, bone marrow) varies in severity that increased according to increase of the dose.