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We conducted this study at the Department of Veterinary Public Health, College of Veterinary Medicine,
University of Baghdad over a period of 4 months to evaluate the effect of adding vitamin AD3E, folic acid, Selenium
(Se), and Zinc (Zn) as dietary supplements on hematological and biochemical parameters of laying hens during the
production period. A total of 105 commercial Lohmann Brown laying hens were used and divided into seven treatment
groups (15 hens per group), which were T1: control group fed basal diet; T2: AD3E (1 g/kg feed) + basal diet, T3: folic
acid (15 mg/kg feed) + basal diet T4: Zn (120 mg/kg feed) + Se (0.2 mg/kg feed) + basal diet, T5: AD3E + folic acid +
basal diet, T6: AD3E + Se + Zn + basal diet, T7: AD3E + folic acid
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