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Weanling Pigs Under Sublethal Concentrations of Atmospheric Carbon Monoxide

University of Illinois at Urbana-Champaign, Urbana 61801

Abstract

Atmospheric carbon monoxide at 200 ppm for 21 d had no adverse effect on any performance or behavioral characteristic measured in weanling pigs. The pigs tended to compensate for carboxy-hemoglobin-induced reduction in oxygen-carrying capacity of their blood by increasing total hemoglobin concentration. Pigs exposed to carbon monoxide at 300 ppm had a 31% reduction in body-weight gain (.20 vs .29 kg/d) and a 20% reduction in feed conversion efficiency (gain/feed = .48 vs .60) at d 10. Over the 21-d exposure period, rate of gain was reduced by 21% (.31 vs .39 kg/d), feed conversion efficiency by 8% (.47 vs .51). There appeared to be a threshold concentration between 200 and 300 ppm above which atmospheric carbon monoxide reduced weanling pigs' performance.

¹ Anim. Sci. Dept. Address reprint requests to: 126 Anim. Sci. Lab., 1207 W. Gregory Dr., Urbana, IL 61801.

² Present address: Provimi Veal, Inc., Watertown, WI 53094.