Milk fat yield was higher tnat that of control group when 20g COMBO was fed,while the somatic cell count (SCC) in the milk was markedly lower that those of control and 13g fed groups.

• 添加20克；增幅达2?74千克?P<0?01?；乳脂量比对照组高9?88%25?P<0?05?；牛奶中体细胞数低于13克组和对照组?P<0?05?。