The stall utilization of lactating cows in the daytaime in a two-row free stall barn

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  • 対頭二列式フリーストール飼養における日中の泌乳牛のストール利用性
  • タイトウ ニレツシキ フリーストール シヨウ ニ オケル ニッチュウ ノ ヒニュウギュウ ノ ストール リヨウセイ

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Abstract

Lactating Holstein cows of 11-15 in a free-stall barn with two head to head rows of 8 were used to investigate each stall utilization due to lyings. Cows during the resting in the daytime were observed voluntarily between mid-June to early August which correspond to the zone of thermoneutral or hot temperatures. A total of 474 Iyings in stalls according to cows were obtained through 78 intermittent recordings and analyzed by using principal component test due to the covariance matrix. From the 1 st principal component with a contribution ratio of 27%, stalls of the south row, where the access to feed troughs was easier and which were favorable for accepting streams of clean air by fans, were favored over stalls of the north row. From the 2nd principal component with that of 23%, interior stalls of a row were favored over end stall where cows were restless and uncomfortable owing to other cow traffic, vicinity of a water trough or relatively narrow stalls by a side curb. From the 3rd principal component with that of 18%, stalls of the south-east side, where cows seemed to have faster access to feed troughs after feedings or to have air cleanness due to fans, were favored over stalls of the north-west side. From relationships between cow characteristics and stall use due to lying, high producing cows tended to have a higher popularity to interior stalls of rows(P<0.05) although the cause remained unexplained and cows with longer stay period in the herd, to south-east stalls(P<0.05) . The sets of results indicated that cows preferred stalls favorable to vicinity of feed troughs, ventilation, no disturbance and so on, and that their preferences were partly correlated with cow characteristics. Jpn. J. Livest. Management, 35(3) : 65-71,2000 Received July 15,1999 Accepted December 10,1999

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