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タイトル: フリーストール飼養された搾乳牛の管理特性に関わる潜在因子
その他のタイトル: The Potential Factors Causing Responsiveness of Dairy Cows to Humans in Free Stall Barns
著者: 植竹, 勝治
金子, さやか
森田, 茂
湯浅, 友紀
干場, 信司
田中 智夫
発行日: Jun-2007
出版者: 日本畜産学会
抄録: 搾乳牛78頭を対象に,フリーストール牛舎において,ヒトの介在場面でウシが示す行動反応12項目に対して因子分析を行った.その上で,得られた因子の因子得点と乳量,産次,乳期,跛行の有無との関連を検討した.第1因子はヒトに対する逃避反応と搾乳室への進入順位,第2因子は搾乳室からフリーストールに戻る際の所要時間,第3因子は搾乳時気質とフリーストールでの居場所,第4因子は搾乳室戻り通路での立ち止まり頻度と見回りのヒトに対する反応に負荷量が高いことから,それぞれ「ヒトに対する恐怖心の強さ」,「鈍重さ」,「搾乳に対する嫌悪性」,「感受性」と解釈した.ヒトに対する恐怖心の強さ(r=-0.20,P=0.10)および搾乳に対する嫌悪性(r=-0.22,P=0.07)と乳量との間に弱い相関がみられた.また,鈍重さに対する産次(P<0.05)ならびに感受性に対する跛行の有無(P<0.01)の効果がそれぞれ有意であった.The major factors that potentially cause responsiveness of Holstein cows in free stall barns were determined. Behavioral observations were conducted on five separate occasions in a commercial dairy farm that had approximately 150 lactating cows in three free stall barns. A total of 78 cows were randomly selected as subjects. Twelve behavioral measurements related to responsiveness to humans in the contexts of milking, inspecting and capturing were analyzed by a factor analysis. Factor scores were estimated for each subject. Correlation coefficients were calculated between factor scores and milk yield. Analysis of variance was used to determine the effects of calving number, lactation stage and lameness on each factor score. The scree plot that bent at the fifth eigenvalue showed four factors present. The measurements concerning flight response to humans and entry into the parlor had large loadings on the first factor. Time required to return from the parlor to the free stall barn had large loadings on the second factor. The milking temperament score and staying area in the free stall barns at about two hours after morning milking had large loadings on the third factor. Stop frequency in the return alley from the milking parlor and response to an inspector had large loadings on the fourth factor. Thus the first to fourth factors were interpreted as “fearfulness of the human”, “sluggishness”, “aversion to milking” and “sensitivity to surrounding”, respectively. The factor scores of fearfulness of the human (r=-0.20, n=71, P=0.10) and illness (r=-0.22, n=71, P=0.07) were weakly correlated with milk yield. The scores of sluggishness and sensitivity were significantly different across the calving number (F3,63=3.56, P<0.05) and lameness (F1,63=7.66, P<0.01), respectively.
URI: http://hdl.handle.net/10659/1358
ISSN: 1346-907X
出現コレクション:学術論文(雑誌)

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