Cowmen might usually assign newcomer cows to unused door feeder. In this case, severe agonistic behavior is likely to occur and cows can not eat under relaxed condition. In this study, eating behavior of cows at door feeder was investigated and some approaches to reduce stress during feeding were attempted. Behavior of 10 lactating cows were observed at 4 stages. First stage : cows were assigned to previous feeder (preexperimental condition) , 2 nd stage : individual identification system was shut off and cows could choose a feeder, 3 rd stage : cows were assigned to feeder based on the results of 2 nd stage, 4 th stage : cows were assigned to feeder based on the dominance order. Agonistic behavior differed little among the stages. Total time of eating behavior at the 3 rd stage was longer than the 1 st stage. Cows at the 3 rd stage and the 4 th stage ate more food than the 1 st stage. Social relationships among cows seemed to be very important for eating behavior. By reshuffling the door feeder assignment it is possible to obtain a calm condition for cows.

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Ten Holstein cows were sprayed with one of two teat-disinfecting solutions, onecontaining iodine, and the other containing mainly fatty and lactic acids but no iodine. The cows were milked twice daily. A six month, double switch-back experimental design was employed which consisted of alternately applying iodine, fatty acid, and iodine disin-fectant treatments for two months each to the cows in group A while the group B cows concurrently received simultaneous alternate treatment of fatty acid, iodine, and fatty acid, also for two months each. Somatic cell counts (SCC) of individual cow were measured monthly by Fosomatic 360. Milk NAGase activity (NAG) was determined four times during the experiment using Nissan fluorometer. Both are used as indicators of udder health. The teat skin conditions, clinical signs of mastitis as well as general health status were observed usually bythe milkers. The means±SD of SCCs and NAG were 57. 4±2. 8× 1, 000/ml versus 56. 7±3. 0× 1, 000/ml and 3. 237±1. 711nmol/min/ml versus 3. 174± 1. 837nmol/min/ml for iodine and no io-dine solutions respectively. No significant differences (p>0.01) in both indicators werefound. However, the teat skin conditions of each cow were better after the non-iodineteat dip solution was applied. This suggests that the non-iodine teat dip solution is amore effective pre-milking teat disinfectant that also eliminates possible iodine contamina-tion of the milk.

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