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This project was supported by Agriculture and Food Research Initiative Competitive Grant no. 2011-68004-30336 from the USDA National Institute of Food and Agriculture Materials and Methods • 20 barrows and 20 gilts were tested using a human approach test (HAT) • Pigs were individually tested within a novel arena for 10 minutes between 1300 and 1900 hours (Fig. 1) • Digital audio recordings of pig vocalizations during HAT were captured with a Marantz recorder • Raven software (Fig. 2) was used to identify peak frequency, duration, and number of vocalizations (Table 1) • Vocalizations were split into two call categories: lowpitched calls (<1000 Hz) and high-pitched calls (≥1000 Hz)

Barrow and Gilt Vocalizations during a Human Approach Test