産卵鶏の筋胃運動回数におよぼす環境温度と採食量の影響

概要

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The effects of ambient temperature and feed intake on the frequency of gastric contraction were studied in three laying hens with chronical electrodes deviced out of fishing hooks. Ambient temperatures were constant at 25°, 30°, 32.5° and 35℃, respectively. It was in this order that each temperature exposure was kept for 3 days. Significant linear regression equations were obtained between feed intake and frequency of gastric contraction in each temperature regime. At temperature regimes of over 32.5℃, the y-intercepts, which express the frequency of gastric contraction when feed intake was scarce, decreased significantly. On the other hand, the regression coefficients, which express the alternation of the frequency of gastric contraction when 1g of feed intake changed, had a tendency to increase. The result of the multiple regression analysis showed that the increasing of ambient temperature decreased the frequency of gastric. contraction. Reciprocally, the increasing feed intake increased the frequency too. These factors had opposite effects on the frequency of the gastric contraction. From the data of the standard partial regression coefficients of the multiple regression, we concluded that feed intake is more effective than ambient temperature.
1987-10-15