Laying hen responses to acute heat stress and carbon dioxide supplementation: I. Blood gas changes and plasma lactate accumulation.
Exposure to heat stress lowered partial pressure of arterial blood carbon dioxide (paCO2), arterial blood bicarbonate ion (HCO3-), but increased arterial blood pH (pHa) and plasma lactate (LA). Increasing ambient carbon dioxide (CO2) to 1.5% increased paCO2 from hypocapnic levels to normocapnic levels, raised HCO3-, lowered pHa and plasma LA to pre-heat stress levels. Following CO2 treatment, respiratory alkalosis conditions returned. It was evident in this study that increasing ambient chamber CO2 to 1.5% was effective in ameliorating acid-base disturbances and reducing elevated levels of plasma LA which normally develops when laying hens are subjected to an acute heat stress exposure.
Koelkebeck
K W
KW
Department of Poultry Science, Texas A&M University System, College Station 77843.
Odom
T W
TW
D000136:Acid-Base Equilibrium / Q000502:physiology; D000208:Acute Disease; D000472:Alkalosis, Respiratory / Q000209:etiology / Q000628:therapy / Q000662:veterinary; D000818:Animals; D001639:Bicarbonates / Q000097:blood; D001833:Body Temperature Regulation / Q000502:physiology; D002245:Carbon Dioxide / Q000097:blood; D002645:Chickens / Q000097:blood / Q000502:physiology*; D005260:Female; D006358:Hot Temperature / Q000009:adverse effects; D006863:Hydrogen-Ion Concentration; D016857:Hypocapnia / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D011201:Poultry Diseases / Q000097:blood / Q000209:etiology / Q000503:physiopathology; D013312:Stress, Physiological / Q000097:blood / Q000503:physiopathology
D001639:Bicarbonates; D007773:Lactates; D002245:Carbon Dioxide; D019344:Lactic Acid