Fig 1. Effects of chronic social stress on growth performance and serum cortisol in pigs.

Pigs (22 ± 0.54kg, Yorkshire cross breed) were subjected to 7 d of chronic social stress by reducing floor space (0.17 m²/pig) and mixing with new pigs. Control pigs were housed at a floor space allowance of 0.33 m²/pig without mixing pigs. (A) Average daily gain (ADG). (B) Average daily feed intake (ADFI). (C) The feed:gain ratio. (D) Serum cortisol calculated as a % change between d0 and d7 of the study. Values are means ± SE (n = 6 per treatment). ** indicates significant difference, P ≤ 0.01; * indicates significant difference, P ≤ 0.05 by Student’s t-test.