The effect of summer hot season on feeding, resting, and visits to the automatic milking system behavior of dairy cows without competition for feed banks

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  • 夏季暑熱が低密度飼養乳牛の飼料摂取行動、休息行動、自動搾乳システム訪問に及ぼす影響
  • カキ ショネツ ガ テイミツド シヨウ ニュウギュウ ノ シリョウ セッシュ コウドウ 、 キュウソク コウドウ 、 ジドウ サクニュウ システム ホウモン ニ オヨボス エイキョウ

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Feeding concentrates with an automatic milking system (AMS) assists dairy cows to visit to an AMS. Effects of a hot summer season on feeding and resting behavior (standing, lying, ruminating) are generally known. We hypothesized visits of dairy cows to AMS, which may be affected by feeding and resting behavior, might be affected by the hot season. The objective of this study was to test this hypothesis. In June (period 1), August (period 2, hot summer season) and November (period 3), we compared behaviors of dairy cows, including visits to the AMS. The change in rectal temperature with the experimental periods suggested the effects of the hot season on the cows. However, the effects of experimental period on feed intake (partial mixed ration, PMR), milk production, and visits to the PMR feed bank and the AMS were not significant. Proportion of time spent standing (P<0.01), lying (P<0.01) and ruminating (P<0.1) was affected by the experimental period, with the highest, lowest and highest values respectively, occurring in period 2. The highest proportion of ruminating time in period 2 might have been affected by the high NDF concentration of PMR. No relation was observed between visits to the AMS and proportion of time of visits to PMR feed bank. The proportion of time spent standing, lying and ruminating tended toward being significantly related to visits to the AMS (P<0.1), and had the lowest, highest and highest proportions of time, respectively, when no AMS visits were observed. Visits to the AMS tended toward significant relation to the resting behaviors (standing and lying), which were affected by the hot summer season. Though an effect of hot season on visits to AMS was not detected, it was suggested that consideration of resting behavior might be important for further investigation aimed at efficient ulitization of AMS.

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