Horn G W, Burrows G E, Lusby K S
Vet Hum Toxicol. 1984 Aug;26(4):309-13.
Lambs and steers were fed low-nitrate hay and supplements which supplied 0.045 kg (lambs) or 0.114 kg (steers) of yeast culture/head/day for 14 and 12 days, respectively, prior to feeding high-nitrate sorghum-sudan hay. Nitrate consumption of lambs by 6 hours after feeding the high-nitrate (29,300 ppm NO3) hay was similar among treatments and ranged from 0.3 to 0.5 g/kg body weight/day over 3 challenge days. Similar rates of nitrate consumption occurred with steers. Blood methemoglobin concentrations, used as a measure of nitrate/nitrite exposure in lambs and steers fed yeast culture, were not lower than those of control animals. The results of the study indicate that yeast culture did not decrease the methemoglobinemia produced by consumption of high-nitrate forages by sheep or cattle.
在给羔羊和肉牛投喂高硝酸盐高粱-苏丹草干草之前，分别给它们饲喂低硝酸盐干草和补充剂，持续14天（羔羊）和12天（肉牛），补充剂的用量为每头每天0.045千克（羔羊）或0.114千克（肉牛）酵母培养物。在投喂高硝酸盐（29300 ppm NO3）干草6小时后，各处理组羔羊的硝酸盐摄入量相似，在3天的挑战期内，摄入量范围为0.3至0.5克/千克体重/天。肉牛的硝酸盐摄入量也类似。在给饲喂酵母培养物的羔羊和肉牛中，用作硝酸盐/亚硝酸盐暴露指标的血液高铁血红蛋白浓度并不低于对照动物。研究结果表明，酵母培养物并不能降低绵羊或牛食用高硝酸盐草料所产生的高铁血红蛋白血症。
