牛における順位確立時期の解明

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タイトル別名
  • Development of the Dominance Order in Holstein Heifers
  • ウシ ニ オケル ジュンイ カクリツ ジキ ノ カイメイ

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抄録

The present investigation was made to ascertain the age at establishing the dominance order among Holstein heifers under group feeding. Fifty-five heifers used in this study were managed in the following three groups based upon their ages; in separation for two months post-partum, in a group of 2 to 3 heifers between three and ten months old, and in a group of ten or more heifers above eleven months old. The heifers in the same group were coupled and a hundred and sixty pairs were introduced to pair-contest with which the dominance order was determined based upon the competition for food. All the movements and postures which the coupled animals showed at the competition around the trough were recorded and these were classified into eight types of behavior according to the behavioral pattern of one animal corresponding to the other. Counting the frequency of each behavior revealed that there were three types of dominance order, that is, non-dominance order (non-aggression), peck-dominance (bi-directional type of dominance order) and peck-right (uni-directional type of dominance order). Heifers had not the dominance order at an early age, but as they grew up, they built up the peck-dominance and finally the peck-right. The ages in month when each type of the dominance order was observed were widely distributed as follows: the non-aggression was from two to nine months old, the peck-dominance was from four to twenty-eight months old and the peck-right was from six months old, Growing up to a definite age in month did not cause the heifers to establish a given type of the dominance order.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 52 (7), 498-506, 1981

    公益社団法人 日本畜産学会

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