Abd El-Hack Mohamed E, Alagawany Mahmoud, Mahrose Khalid M, Arif Muhammad, Saeed Muhammad, Arain Muhammad A, Soomro Rab N, Siyal Farman A, Fazlani Sarfraz A, Fowler Justin
Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Egypt.
Department of Animal Sciences, University College of Agriculture, University of Sargodha, Sargodha, 40100, Pakistan.
Anim Nutr. 2019 Mar;5(1):49-55. doi: 10.1016/j.aninu.2018.04.008. Epub 2018 May 14.
This present study aimed to determine the efficacy of supplementing layer diets with vitamin A (0, 8,000 and 16,000 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 ( ≤ 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 ( ≤ 0.01) and a decrease in basophils counts ( ≤ 0.05) in response to vitamin E. Significant decreases were observed in packed cell volume (PCV), thyroxine (T), alanine transferase (ALT), albumin, total cholesterol and total lipids ( ( ≤ 0.05 or ≤ 0.01) ≤ 0.01) , and increases were observed in serum concentrations of globulin ( ≤ 0.05) and calcium ( ≤ 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 ( ≤ 0.05 or ≤ 0.01). Feed intake, FCR, PCV, Hb, lymphocytes, monocytes, eosinophils, T, ALT and total protein were significantly affected by the interaction of vitamins A and E ( ≤ 0.05 or ≤ 0.01). The interaction of vitamins A and E was only significant with respect to serum total protein ( ≤ 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.
本研究旨在确定在夏季条件下饲养的蛋鸡日粮中单独或组合添加维生素A（0、8000和16000国际单位/千克日粮）和维生素E（0、250和500毫克/千克日粮）对产蛋性能、蛋品质、血液学和血液生化指标的影响。总共135只博万斯褐壳蛋鸡按照3×3析因设计分配到9个处理组，每组3只母鸡，重复5次。随着维生素A或维生素E添加量的增加，饲料转化率（FCR）显著改善（P≤0.01）。在所有组中，饲喂添加16000国际单位维生素A加500毫克维生素E/千克日粮的母鸡FCR最佳。维生素A和维生素E水平的交互作用对蛋品质性状没有显著影响。维生素E使单核细胞显著增加（P≤0.01），嗜碱性粒细胞计数显著减少（P≤0.05）。维生素A使红细胞压积（PCV）、甲状腺素（T）、丙氨酸转氨酶（ALT）、白蛋白、总胆固醇和总脂质显著降低（P≤0.05或P≤0.01），血清球蛋白浓度（P≤0.05）和钙（P≤0.01）显著升高。在所有组中，每千克日粮添加0国际单位维生素A和500毫克维生素E的组合PCV值最高（40.09%），血红蛋白（Hb）值最高（10.33毫克/100毫升）。维生素E提高了血清总蛋白、总胆固醇和总脂质的值（P≤0.05或P≤0.01）。维生素A和维生素E的交互作用对采食量、FCR、PCV、Hb、淋巴细胞、单核细胞、嗜酸性粒细胞、T、ALT和总蛋白有显著影响（P≤0.05或P≤0.01）。维生素A和维生素E的交互作用仅对血清总蛋白有显著影响（P≤0.05）。可以得出结论，在蛋鸡日粮中添加维生素A和维生素E在减轻高温环境的有害影响方面取得了良好效果。每千克日粮添加16000国际单位维生素A和500毫克维生素E的组合对于在炎热夏季条件下饲养的蛋鸡获得更好的生产性能更为适宜。
