日粮添加不同水平的奶牛专用霉菌毒素吸附剂对粪中双歧杆菌数量和乳中黄曲霉毒素含量的影响

The Effect of Different Mycotoxin Binder Levels Supplementation on Feces Bifidobacterium Bifidum Number and Milk AFM1 Content in Lactating Dairy Cows

奶牛饲料原料中霉菌毒素广泛存在,并严重地威胁着奶牛健康,影响着奶牛生产性能的发挥。本试验选择年龄、胎次、产奶量、泌乳天数相近的荷斯坦牛80头探讨日粮添加4种剂量(0、10、15、20g)的霉菌毒素吸附剂对奶牛粪便中双歧杆菌数量和原料奶中黄曲霉毒素残留量的影响。与对照组(添加霉菌毒素吸附剂0g)相比,试验组奶牛粪便中双歧杆菌的外排量明显降低,但各实验组之间差异不显著,仅有数值上的变化。同时,随着霉菌毒素吸附剂含量的增加,原料奶中体细胞数呈现下降的趋势。与试验前相比,原料奶中黄曲霉毒素含量显著降低(P<0.05),且随着添加剂量的增加其黄曲霉毒素残留量更少,但添加20g与15g间无明显变化。因此,本研究表明,随着日粮中霉菌毒素吸附剂添加量的增加,可有效降低原料奶中黄曲霉毒素的残留量,进而提高原料奶质量。

Mycotoxin in feed can bring negative effect on dairy health and decrease production of lactating dairy cows.The objective of this study was to evaluate changes of feces bifidobacterium bifidum number and milk AFM1 concentration when dietary different levels mycotoxin binder was supplemented in lactating dairy cattle.Eighty Chinese Holstein dairy cows were randomly assigned to control group with 20g powdered zeolite for a cow per day.The three experimental group received supplementation of 10g mycotoxin binder and 10g powdered zeolite for a cow per day,15g mycotoxin binder and 5g powdered zeolite,or 20g mycotoxin binder.Meantime,all cows were fed the same basal diets.It was shown that dietary different levels of mycotoxin binder adding can decline bifidobacterium bifidum number of feces,but there was no significant difference.In contrast with before the experiment,aflatoxin M1 of raw milk in experimental treatment declined（P0.05）,and aflatoxin M1 residues was in less with mycotoxin binder enhancing.Milk aflatoxin M1 concentration in control treatment did not change compared with start of experiment.Therefore,the study indicated that different levels mycotoxin binder may improve raw milk quality.