Bahraini Zohreh, Salari Somayyeh, Sari Mohsen, Fayazi Jamal, Behgar Mehdi
Department of Animal Science, Animal Science and Food Technology Faculty, Ramin Agriculture and Natural Resources University of Khouzestan, Ahwaz, Iran.
Agricultural, Medical, and Industrial Research School, Nuclear Science & Technology Research Institute, Karaj, Iran.
Anim Sci J. 2017 Sep;88(9):1425-1435. doi: 10.1111/asj.12784. Epub 2017 Mar 30.
This study was conducted to compare the effects of electron beam (EB) and gamma ray (GR) irradiation treatments at doses of 10, 20 and 30 kGy on chemical composition, protein quality and protein digestibility of cottonseed meal (CSM). GR irradiation in all doses significantly decreased the crude fiber of samples compared to raw CSM. Free and total gossypol content of CSM was decreased significantly by utilizing both types of irradiation in a dose-dependent manner. Also, EB irradiation caused decrease in free and total gossypol content more than that of GR irradiation. GR irradiation at doses of 20 and 30 kGy, and EB irradiation at doses of 10, 20 and 30 kGy can significantly decrease protein solubility of CSM compared to that of a raw sample. GR irradiation at a dose of 30 kGy significantly increased apparent digestibility of protein compared to raw and EB irradiation of CSM at a dose of 10 kGy in Leghorn cockerels. Maximum increase in protein digestibility of CSM was observed in GR irradiation at a dose of 30 kGy. In conclusion, the present study showed that EB and GR irradiation reduced gossypol and crude fiber and increased protein digestibility of CSM but had no effect on protein quality of CSM.
本研究旨在比较10、20和30千戈瑞剂量的电子束（EB）和伽马射线（GR）辐照处理对棉籽粕（CSM）化学成分、蛋白质质量和蛋白质消化率的影响。与未加工的棉籽粕相比，所有剂量的伽马射线辐照均显著降低了样品的粗纤维含量。两种辐照方式均以剂量依赖的方式显著降低了棉籽粕的游离棉酚和总棉酚含量。此外，电子束辐照导致的游离棉酚和总棉酚含量下降幅度大于伽马射线辐照。与未加工样品相比，20和30千戈瑞剂量的伽马射线辐照以及10、20和30千戈瑞剂量的电子束辐照均可显著降低棉籽粕的蛋白质溶解度。在来亨鸡中，30千戈瑞剂量的伽马射线辐照相比未加工的棉籽粕以及10千戈瑞剂量的电子束辐照显著提高了蛋白质的表观消化率。棉籽粕蛋白质消化率的最大增幅出现在30千戈瑞剂量的伽马射线辐照中。总之，本研究表明，电子束和伽马射线辐照降低了棉籽粕中的棉酚和粗纤维含量，提高了蛋白质消化率，但对棉籽粕的蛋白质质量没有影响。
