During the summer, temperatures in swine buildings often rise to levels that adversely affect animal performance and the profitability of these operations. Heat stress reduces reproductive efficiency in the breeding herd, affecting both the boar and sow. During extended hot weather periods, death of farrowing sows may result.
Fehr, Robert L.; Priddy, K. T.; McNeill, Samuel G.; and Overhults, Douglas G., "Limiting Swine Stress with Evaporative Cooling in Kentucky" (1980). Agricultural Engineering Extension Updates. 60.