title: Weanling pigs under sublethal concentrations of atmospheric carbon monoxide.
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 carboxyhemoglobin-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.
mesh_terms: D000818:Animals; D001835:Body Weight; D002249:Carbon Monoxide Poisoning / Q000097:blood / Q000503:physiopathology / Q000662:veterinary*; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D010108:Oxyhemoglobins / Q000032:analysis; D013552:Swine; D013553:Swine Diseases / Q000097:blood / Q000503:physiopathology*; D014886:Weaning
chemical_list: D006454:Hemoglobins; D010108:Oxyhemoglobins