(2) the response of prenatal temperature conditioned hens to cold or heat stress during the laying period. Plasma triiodothyronine (T3) and thyroxine (T4) levels and oxidant and antioxidant enzyme activities of laying hens were also investigated
(2) the response of prenatal temperature conditionedhens to cold or heat stress during the laying period.Plasma triiodothyronine (T3) and thyroxine (T4) levels and oxidantand antioxidant enzyme activities of laying hens were alsoinvestigated