Abstract
To evaluate the lying area for cows, the stall standing index (SSI) generally used in free-stall barns was monitored in tie-stall barns. The SSI was monitored every ten minutes at four farms after feeding. The SSI values reached their minimum (about 10%) at 90 minutes after feeding on all farms. The SSI at 90 minutes after feeding was significantly associated with the incidence rate of claw horn diseases (CHD) (P <0.01), displacement of the abomasum (DA) (P <0.05), mortality and culling (P <0.01) over the past three years in 39 tie-stall barns. The SSI at 90 minutes after feeding on the farm which had the highest rate of CHD, DA, mortality, and culling was 47.1%, although this value was the minimum. This study suggests that the SSI is an index for the lying area for cows in tie-stall barns as well.
