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A one-year field study compared the conventional 25OWIR heat lamp with an energy-efficient 175W radiant heat lamp for swine farrowing operations. The energy-efficient heat lamp showed a $36 armual cash savings per unit (assuming SO.lO/kWh electricity); a 1.2% absolute reduction in piglet mortality from birth to weaning (5.0±0.28% v^. 6.2±0.44%) (P 0.05). The possible benefits of using the energy-efficient heat lamp include an annnal energy savings of $5,400 and 284 more weaned pigs for a 1,000-sow farrowing operation. The study also revealed circadian patterns of thermoregulatory behavior of the piglets, i.e., higher heat lamp usage during the day and lower at night. Both the frequency and the magnitude of heat lamp usage seemed to depend on heat lamp size and piglet age. Particularly, piglets spent more time under the 175W heat lamp than under the 250W heat lamp, although visits to the heat lamps decreased lamp with piglet age in both instances. The results suggest that to accommodate the progressively decreasing thermal needs of the piglets, a variable-output heat lamp would

Behavior-based assessment of thermal requirements of piglets from birth to weaning