Abstract
Nutrient intake and digestibility data were obtained with four yearling wethers during exposures to 4, 8, 12, 16 and 18% CO2 in air for periods of 5 to 7 days. Dry matter intake was not affected by exposure to 4% CO2, but intake was inversely related to CO2 concentration at all other exposure levels. Nutrient digestibility was not influenced by CO2 levels up to 16%. At 16 and 18% CO2 variable decreases in nutrient digestibility were noted. Rapid, labored breathing was observed at the onset of all trials. A return toward normal respiration was noted within 24 hr. at the 4, 8 and 12% CO2 exposures, but at 16 and 18% CO2 the condition persisted throughout the trials.
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