Vergleichende Untersuchungen zur Wärmeproduktion wachsender Broiler bei Anwendung unterschiedlicher Meßmethoden

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Abstract
The heat production (HP) of 6 broilers at 8 stages of live weight development (100-1.500 g) was comparatively measured over 24 h according to the total metabolism method and over 20 min periods in the postabsorptive stage on the feeding level in maintenance and 2x maintenance. The feed supplied had a crude protein content of 20% or 40% of the dry matter. The standard mean deviation of the short-time measuring (.+-. 12%) was twice as high as the 24 h-measuring. On the feeding level maintenance or 2x maintenance HP as determined over 24 h was 15%, 30% higher than the HP converted from 20 min-measuring period into 24 h. Between the 2 nutrition levels there were differences in the HP of 36% and 22% between the measurings over 24 h and 20 min, respectively. The different protein supply had no influence on the level of HP. There were statistically significant correlations between the HP measured according to the 2 methods. A correlation for HP (0.896) (.alpha. = 0.01) was calculated from the total number of 90 paired comparable measured values. Quantitative statements on HP over the period of 24 h cannot directly be derived from 20 min-measurings in the post-absorptive state.

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