Studies on energy metabolism in swine. II. Heat production in piglets at fasting.:II. Heat production in piglets at fasting

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Heat production at fasting was determined with 6 piglets each weighing 13-24kg (Middle White, male, at age over 35 days) using a HALDANE Type appatus for respiration test at an ambient temperature of 25°C. The results revealed a close negative correlation (r=-0.83) between the heat production at fasting (Y: kcal/kg0.75. day) and the metabolic body size (x: kg0.75), and a regression equation of Y=-2.14X+140.97 was obtained.Earlier studies on heat production at fasting with pigs weighing more than 25kg revealed that the heat production by them at fasting decreased as they gained weight, but this decrease was almost negligible in consideration of energy metabolism. However, the ratio of the decrease in the heat production at fasting as found out in the present study using piglets weighing less than 25kg was too big to be neglected in the energy metabolism. It was therefore concluded that the heat production can not be neglected in energy metabolism when piglets weighing less than 25kg are to be used.
日本養豚学会の論文