PSII-26 Changes in growth performance, cytokine profile and eating and drinking behaviors of growing pigs subjected to an induced heat stress. (5th December 2019)

• Record Type: Journal Article
• Authors: Anderson, Lauren E; Holt, Jonathan P
• Is Part Of: Journal of animal science. Volume 97(2019)Supplement 3
• Page Start: 215
• Page End: 215
• Publication Date: 2019-12-05
• Subjects: heat stress -- cytokines; Livestock -- Periodicals; Livestock; Electronic journals; Periodicals; 636.005
• DOI: 10.1093/jas/skz258.440
• Languages: English
• ISSNs: 0021-8812

Abstract

Abstract: This study was conducted to determine effects of induced heat stress on growth performance, cytokine profile and eating and drinking behaviors of growing pigs. Pigs (n = 32; average BW =42.25±0.78 kg) were housed individually in thermo-neutral conditions (CON) or subjected to constant high ambient temperatures (mean 81.7°F) for 15 d (HS), followed by a 7 d recovery period (mean 68.6°F). Pig weights and feed disappearance were recorded on d 0, 8, 15 and 22 for calculations of ADG, ADFI and GF. Blood samples were taken via venipuncture on d 2, 8, 15 and 22, and serum was analyzed for cytokine profile by multiplex-ELISA. Four pigs per treatment were video-recorded on d 2, 6, 9, 16 and 21 for 2 h at 800, 1300 and 1600. Frequency and duration of eating and drinking were recorded. HS pigs had lower ADFI (1.97 kg/d) and ADG (0.91 kg/d) compared to CON pigs (2.39 and 1.11 kg/d, respectively) during wk 1. HS pigs had lower ADFI (2.24 kg/d) during the recovery period compared to CON (2.74 kg/d) pigs. During the overall trial period, HS pigs had lower ADFI (2.30 kg/d) and ADG (0.99 kg/d) compared to CON pigs (2.69 and 1.14 kg/d, respectively), however, GF for HS pigs (0.43) was not different from CON (0.42). HS pigs had increased IL1β (617 pg/mL) and IL12 (1380 pg/mL) compared to CON pigs (248 and 1127 pg/mL, respectively). IL8 was increased for CON (1340 pg/mL) compared to HS (522 pg/mL; P < 0.001). HS pigs ate less frequently in the morning (2 times/h) compared to CON pigs (4.1 times/h; time x treatment interaction, P = 0.003). Regardless of treatment, drinking frequency increased from 1600–1800 (5.7 times/h) compared to 800–1000 (2 times/h; P < 0.001). Heat stress reduces performance, increases circulating inflammatory cytokines and alters daily time of eating.