Effects of multi-nutrient mineral blocks on performance and health parameters of cows in dry lot housing

To evaluate additional effects of compound nutrient block,an experiment group(EG)and a control group(CG)were designed.There are three milk yield levels in each group,including high-yielding,middle-yielding and low-yielding cows.Compared to CG,the milk yields of the cows in EG averagely increased by 4.85%.In the middle-yielding cows,the daily milk yield was the highest,increased by 12.1%(P0.05),but the somatic cell number in milk averagely decreased by 50.0%(P0.01),the allotriophagia significantly decreased and so did the lameness and mastitis averagely by 92.8% and 54.0% respectively.Supplemental effect of multi-nutrient mineral blocks on physiological function and production performance for different milk-yield cows showed disparate local.