242 superoxide dismutase, 7 trace element, 21 triiodothyronine, 8, 78, 119 T testosterone, 101 W thioredoxin reductases, 9 white muscle disease, 15 thyroxine, 8, 78 –tocopherol, 12 242 ซีลีเนียมในการผลิตปศสตว์ Selenium in Livestock Production ุ ั