| 1 | Productive performance, egg quality, hematological parameters and serum chemistry of laying hens fed diets supplemented with certain fat-soluble vitamins, individually or combined, during summer season显示文摘This present study aimed to determine the efficacy of supplementing layer diets with vitamin A(0, 8,000 and16,000 IU/kg diet) and vitamin E(0, 250 and 500 mg/kg diet) either individually or in combination on egg production and quality, and blood hematology and chemistry of birds reared under summer conditions. A total of 135 Bovans Brown laying hens were distributed to 9 treatment groups with 5 replicates of 3 hens/pen in a 3 × 3 factorial design. A significant improvement in feed conversion ratio(FCR) was observed as supplementary vitamin A or E increased(P 0.01). Hens fed diets supplemented with 16,000 IU vitamin A plus 500 mg vitamin E/kg diet had the best FCR among all groups. Egg quality traits were not significantly affected by the interaction of vitamin A and vitamin E levels. There was a significant increase in monocytes(P ≤ 0.01)and a decrease in basophils counts(P ≤ 0.05) in response to vitamin E. Significant decreases were observed in packed cell volume(PCV), thyroxine(T_4), alanine transferase(ALT), albumin, total cholesterol and total lipids((P ≤ 0.05 or P ≤ 0.01) P 0.01), and increases were observed in serum concentrations of globulin(P ≤ 0.05)and calcium(P ≤ 0.01) due to vitamin A. The combination of 0 IU vitamin A and 500 mg vitamin E/kg diet had the highest values of PCV(40.09%) and hemoglobin(Hb)(10.33 mg/100 mL) among all groups. Vitamin E raised serum values of total protein, total cholesterol and total lipids(P ≤ 0.05 or P≤ 0.01). Feed intake, FCR,PCV, Hb, lymphocytes, monocytes, eosinophils, T_4, ALT and total protein were significantly affected by the interaction of vitamins A and E(P ≤ 0.05 or P ≤ 0.01). The interaction of vitamins A and E was only significant with respect to serum total protein(P ≤ 0.05). It can be concluded that layer diets supplemented with vitamins A and E had good results in alleviating the harmful impacts of high ambient temperature. The combination of 16,000 IU vitamin A and 500 mg vitamin E per kilogram diet is preferable for obtaining better production of laying hens reared under hot summer conditions. | Mohamed E.Abd El-Hack Mahmoud Alagawany Khalid M.Mahrose Muhammad Arif Muhammad Saeed Muhammad A.Arain Rab N.Soomro Farman A.Siyal Sarfraz A.Fazlani Justin Fowler | 2019 | Animal Nutrition2019，，1： | 3 |
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