title: Changes in the electrolytes of serum and urine with heat exposure in the bovine.
abstract: Six mature Friesian bulls with an average body weight of 562 kg were kept - after a preparatory period - in a controlled climatic barn at 30 degrees C and 70% relative humidity for three weeks. They were fed 3.6 kg concentrates and 4 kg hay and water ad libitum. The rectal temperature remained unchanged under heat exposure. Na+, K+, and Ca++ increased in the blood serum, but decreased in the urine. Whereas PO4---increased in the serum and in the urine, the values for SO4--decreased in the serum and in the urine. The serum value for Cl- did not change, but the Cl- value decreased in the urine. The changes in the electrolyte metabolism at high environmental temperatures are important means of extending the discovery procedures for heat stress in cattle.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D002417:Cattle / Q000378:metabolism*; D002712:Chlorides / Q000378:metabolism; D004573:Electrolytes / Q000097:blood / Q000378:metabolism* / Q000652:urine; D006358:Hot Temperature; D006813:Humidity; D008297:Male; D010710:Phosphates / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism; D013431:Sulfates / Q000378:metabolism
chemical_list: D002712:Chlorides; D004573:Electrolytes; D010710:Phosphates; D013431:Sulfates; D012964:Sodium; D011188:Potassium; D002118:Calcium