Abstract
Estimates ranging from 0.30 to 1.00 were evaluated as the value of exponent b of metabolic body size (Wbkg) for young growing pigs by use of a multilinear regression equation HP = q + (1−a) ME + ak Wbkg. Data on heat production, metabolizable energy intake, and average empty body weight for 87 pigs, ranging from 5 to 35 kg liveweight, of Lacombe, Yorkshire, Hampshire × Yorkshire, and Lacombe × Yorkshire breeding and for all pigs combined were used in this study. The criteria of best fit were the maximum coefficient of determination and the minimum coefficient of variation. The use of a particular exponent from 0.30 to 1.00 did not markedly influence the best fit. Differences in R2 and C.V. from using different exponent values were negligible. Because the results of this study and those from the literature suggest that no marked variation in precision results from using different values of exponent b, the use of 0.75 as the general reference base in calculating metabolic body size for growing pigs is recommended.
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