Abd El-Hack Mohamed E, Mahrose Khalid, Arif Muhammad, Chaudhry Maria Tabassum, Saadeldin Islam M, Saeed Muhammad, Soomro Rab Nawaz, Abbasi Imtiaz Hussain Raja, Rehman Zaib Ur
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.
Environ Sci Pollut Res Int. 2017 Apr;24(11):10708-10717. doi: 10.1007/s11356-017-8690-5. Epub 2017 Mar 11.
The present study was designed to alleviate the negative biohazards of high ambient temperature on the productive performance and physiological status of laying hens. A total of 135 Bovans laying hens were distributed into nine groups in a 3 × 3 factorial design experiment. Basal diet was supplemented with vitamin E at levels of 0, 250, and 500 mg /kg diet. Within each dietary vitamin E level, each diet was supplemented with sodium selenite as a source of selenium (Se) to supply 0, 0.25, and 0.50 mg Se/kg diet. Results showed that supplementing layer's diet with 500 mg vitamin E/kg was accompanied with the lowest feed consumption (FC) and feed conversion ratio (FCR). The interaction among vitamin E and Se levels exerted significant effects only on FC and FCR. Insignificant differences were observed in egg quality criteria due to the treatments studied. Increasing vitamin E level was associated with a gradual decrease in basophil count and an increase in monocytes. A gradual decrease in the count of each of heterophils, monocytes, and eosinophils was observed with the elevation in the dietary Se level. The combination among vitamin E and Se levels produced a significant effect on all hematological parameters studied. As vitamin E increased, a marked decrease in serum AST and a gradual increase in total lipids, total cholesterol, and calcium were observed. As the level of dietary Se increased, serum total protein, albumin, T, total cholesterol, and total lipids increased. No significant impacts were detected for the interaction among vitamin E and Se levels on any of blood constituents determined except serum globulin, ALT, and calcium. In conclusion, the combination between vitamin E and Se showed a good ability to alleviate the harmful impacts of heat stress and produced the highest productive performance when compared with the other groups, which exhibit the synergistic effect between the two antioxidants.
本研究旨在减轻高温环境对蛋鸡生产性能和生理状态的负面生物危害。在一项3×3析因设计实验中，将总共135只博万斯蛋鸡分为9组。基础日粮分别添加0、250和500 mg/kg日粮水平的维生素E。在每个日粮维生素E水平内，每种日粮添加亚硒酸钠作为硒（Se）源，以提供0、0.25和0.50 mg Se/kg日粮。结果表明，日粮中添加500 mg维生素E/kg时，采食量（FC）和饲料转化率（FCR）最低。维生素E和硒水平之间的交互作用仅对采食量和饲料转化率有显著影响。在所研究的处理中，蛋品质指标差异不显著。维生素E水平升高与嗜碱性粒细胞计数逐渐减少和单核细胞增加有关。随着日粮硒水平的升高，嗜异性粒细胞、单核细胞和嗜酸性粒细胞的数量均逐渐减少。维生素E和硒水平的组合对所有研究的血液学参数均产生显著影响。随着维生素E增加，血清谷草转氨酶显著降低，总脂质、总胆固醇和钙逐渐增加。随着日粮硒水平的增加，血清总蛋白、白蛋白、T、总胆固醇和总脂质增加。除血清球蛋白、谷丙转氨酶和钙外，维生素E和硒水平之间的交互作用对所测定的任何血液成分均未检测到显著影响。总之，与其他组相比，维生素E和硒的组合显示出良好的减轻热应激有害影响的能力，并产生了最高的生产性能，这表明两种抗氧化剂之间具有协同作用。
