Abstract
In a previous experiment (SATO et al, 1976) it was shown that the spatial pattern of grazing cattle varied seasonally and it was considered that one of the factors by which this pattern was affected was an appetite. In view of the significance of the relationship between the appetite levels and the spatial pattern of grazing cattle, the investigations were undertaken to study the spatial pattern of grazing cattle after fasting in each season. In addition, the summer observations were made to study the relationship between the appearance of biting insects and the spatial pattern of grazing cattle, and from this results the authors discussed the relationship between the appetite factor and the biting insects factor. The results observed were as follows: 1) In spring, the spatial pattern of the experimental herd after fasting was more dispersed than that of the control herd (P<0.005). In summer and autumn, this pattern after fasting was about the same with that of the control herd. 2) In spring, the spatial pattern of the commercial herd (lactating cows) after fasting was also more dispersed. 3) In summer, the spatial pattern of grazing cattle which were sprayed the insectiside and the repellent was more dispersed than that of the control herd.
