Abstract
Current swine standards underestimate total heat production (THP) approximately 30%, butbefore standards are updated, several protocol questions need to be answered. A study was designed todetermine if individual animal heat production would be representative of group heat production. ThirtyLarge White x Landrace cross-bred barrows weighing approximately 5 - 10 kg were randomly assigned toone of two group treatments, group penned (G) (four pigs/pen), or individually penned (I). In a repeatedLatin Square design, over a three-wk period pens were exposed to each of three temperaturetreatments18, 25, or 32C, for a 21-hr period. Total heat production, latent heat loss (LHL) and sensibleheat loss (SHL) were calculated using indirect calorimetry methods. Results indicated that there were nodifferences due to group size in THP (I-765 vs. G-769 KJ/kg0.75*day), SHL (I-376 vs G-418 KJ/kg0.75*day),or LHL (I-406 vs. G-352 KJ/kg0.75*day). Temperature treatment had a significant impact on THP (18C-833, 25C-757, 32C-708 KJ/kg0.75*day), SHL (18C-597, 25C-414, 32C-180 KJ/kg0.75*day), and LHL (18C-253, 25C-347, 32C-537 KJ/kg0.75*day). These data suggest that heat production measurements taken onindividual animals would be the same as group animal data.
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