バヒアグラス草地に昼間放牧される黒毛和種牛群の行動 : 牛群の空間分布と採食時間割合(第16回家畜行動に関する小集会報告)

概要

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Behavior of Japanese Black heifers and steers grazing a bahiagrass pasture in the daytime (9-16 h) was investigated in terms of the spatial distribution of animals and the percentage grazing time (PGT). The spatial distribution was described as the distribution of the number of animals in a paddock, an alley and a resting area. The degree of aggregation of animals (O/E ratio) in the paddock and alley varied with the intake of supplementary feed (IS) and the meteorological factors. The IS had a negative effect on the O/E ratio in the paddock, and a positive effect on the O/E ratio in the alley. The PGT was described on a basis of the whole daytime grazing period and the one-hour periods in the whole period. The PGT during the whole daytime grazing period was expressed by a mathematical model using IS and air temperature as predictors. The PGT in the one-hour periods was analyzed by examining its frequency distribution and the relationship to the PGT in the whole period. The animals showed highest PGT with lowest variation in the period of 10-11 h. The PGT in the first one hour (9-10 h) was most highly correlated with that in the whole period. Implications of the behaviors to the system management were briefly discussed.
1996-10-11