経歴の異なるウシの同一群内における個体間距離と行動の同時性  [in Japanese] Coordination of Behavior and Distance between Each Pair in a Herd Composed of Cattle with Different Histories  [in Japanese]

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Abstract

互に認知しないいくつかのグループからなる群における個体間関係を行動の同時性,個体間距離という両側面から明らかにしそれにかかわる要因を統計的に確認した.供試牛群は経歴の異なる3つのグループ,すなわち黒毛和種雌成牛6頭(J-Aグループ),ホルスタイン種雌育成牛4頭(H-B),同2頭(H-C)からなり,2haの牧区に11日間一諸に放牧した.調査はうち4日間,日中5分間隔で,牧区内の個体の位置および行動を記録した.行動の同時性および個体間距離を測定し,クラスター分析によりそれぞれのデンドログラムを作成した.<br>その結果,同経歴グループの個体間は,行動の同時性を示す一致係数が平均68.7%,個体間距離が平均28.4m,一方異経歴グループの個体間ではそれぞれ60%,41.8mであり,各個体は他のグループより同経歴グループの個体,特にそのなかの年齢の近い個体と密接なきずなをもつ傾向にあった.またH-Cグループが同品種のH-BグループよりJ-Aグループときずなが強かったこと,さらにJ-Aグループの最若齢個体がH-Cグループと密接なきずなをもったことが明らかにされた.<br>以上から,品種,経歴,年齢,所属するグループの大きさといった諸要因が複雑に絡みあって,個体間関係に影響を及ぼしているものと推察された。

Experiments to statistically confirm relationships between individuals in a herd which was composed of new individuals with different histories were done from 2 view points: that is, behavior coordination and distance between individuals. The herd used in the experiments consisted of 3 groups that had no previous chance of getting together prior to the experiments. These 3 groups were termed J-A (6 Japanese Blacks), H-B (4 Holsteins) and H-C (2 Holsteins), respectively. Experiments were done on 4 days during an 11-day grazing period in spring, and the location of each individual in a 2-ha paddock and its behavior were recorded every 5 min. from dawn to dusk on each of the 4 days. The behavior coordination and distance between each pair in 12 individuals of cattle were studied by cluster analysis. Individuals within each group tended to have close bonds and similar behavior with the others of their own group, and above all, preferred a specified intimate companion within each group. Group H-C associated with group J-A rather than with group H-B of the same breed. The youngest cow in group J-A associated more closely with group H-C than with group J-A. These relationships between and within groups seemed attributable to differences in history in their growth, breed, age, and group size within the herd, which were complicatedly intertwined with each other.

Journal

  • Nihon Chikusan Gakkaiho

    Nihon Chikusan Gakkaiho 57(12), 992-999, 1986

    Japanese Society of Animal Science

Cited by:  1

Codes

  • NII Article ID (NAID)
    130000739783
  • NII NACSIS-CAT ID (NCID)
    AN00195188
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    1346-907X
  • NDL Article ID
    3122703
  • NDL Source Classification
    RB83(畜産--家畜--牛)
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-348
  • Data Source
    CJPref  NDL  J-STAGE 
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