Influence of radiant heat stress on respiratory water loss in new-born lambs.
Respiratory water loss, oxygen consumption and carbon dioxide production were measured during rest and during moderate radiant heat stress in 9 healthy unanaesthetized lambs, age 4-15 days. The method used is based on an open flow-through system with a mass spectrometer for gas analyses. Respiratory water loss was 12.7 mg/kg min when the lamb was at rest and increased to 24.7 mg/kg min during heat stress. Oxygen consumption was 13.9 ml/kg min at rest and remained unchanged during heat stress. The mean rate of breathing increased from 63 to 125 breaths/min.
D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001831:Body Temperature; D001834:Body Water / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D006358:Hot Temperature; D008168:Lung / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D010101:Oxygen Consumption; D012119:Respiration; D012756:Sheep; D013312:Stress, Physiological / Q000503:physiopathology*
D002245:Carbon Dioxide; D010100:Oxygen