Heat lamps are a standard tool in farrowing barns, but recent research suggests that how heat is delivered may matter more than how much heat is added. A three-part research series from NC State Extension examined the relationship between farrowing stall size, number of heat lamps, sow behavior, and piglet use of creep areas—offering practical insight for today’s producers.
Stall Design Sets the Foundation
The first phase of the research evaluated standard versus larger farrowing stalls using one or two heat lamps. Results showed that simply adding a second heat lamp did not consistently improve piglet performance. Instead, stall size influenced sow movement, posture, and space utilization—factors closely tied to piglet safety and survivability.
From a management standpoint, this reinforces that stall design and layout are foundational, while supplemental heat works best when paired with good physical flow and piglet access.
Sow Behavior: Space Over Hardware
In the second study, researchers focused on sow behavior during and after farrowing. Larger stalls allowed sows to change posture more naturally and reduced abrupt movements associated with piglet crushing risk. Adding an extra heat lamp did not significantly alter sow behavior, indicating that space and design had a greater impact than additional equipment.
For producers, this highlights an important balance: heat supports piglets, but stall geometry supports both sow welfare and piglet protection.
Piglet Use of Heat Lamps: Placement Matters
The final phase examined piglet behavior and time spent under heat lamps. Piglets reliably used heated creep areas, but time spent under lamps did not increase substantially when a second lamp was added. Instead, piglets responded to location, accessibility, and comfort.
This suggests that proper lamp placement and well-defined creep areas may deliver more benefit than doubling heat output, particularly when considering energy costs and barn temperature management.
Practical Takeaways for Producers
The combined findings point to a clear conclusion: more heat is not always better. One well-placed heat lamp in a properly designed stall can be just as effective as multiple lamps in a sub-optimal layout.
Key considerations moving forward:
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Focus on stall size and creep area design before adding equipment
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Prioritize lamp placement over lamp quantity
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Evaluate energy use alongside piglet behavior and comfort
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View farrowing environments as integrated systems, not standalone components
As producers continue to weigh animal welfare expectations, labor efficiency, and energy costs, this research reinforces the importance of design-driven management. Heat lamps remain a critical tool—but their effectiveness is maximized when barn layout, sow behavior, and piglet needs are aligned.
