Effect of temperature stress on circulating biogenic amines in bovine.
A sensitive, simple and selective chromatographic method using high performance liquid chromatography was developed to measure circulating levels of histamine (HI), norepinephrine (NE), dopamine (DA) and serotonin (5-HT) as indicators of response to thermal stress in two breeds of cattle. Duplicate exposures for 8 hr to 13 degrees C resulted in significantly elevated plasma NE and DA in longhorns but not in Herefords and suggest a relatively greater sensitivity to the cold (13 degrees C) in the longhorn. Environmental temperatures of 32 and 42 degrees C significantly increased rectal temperatures of both breeds with much higher rectal temperatures in Herefords. The 32 and 42 degrees C effects on circulating NE and DA of Herefords were highly significant but not in the longhorn. However, heat stress significantly elevated HI and 5-HT in the longhorn which may account for their relatively greater heat tolerance based on their lower rectal temperatures.
D000818:Animals; D001679:Biogenic Amines / Q000097:blood*; D002417:Cattle; D003080:Cold Temperature; D004298:Dopamine / Q000097:blood; D006632:Histamine / Q000097:blood; D008297:Male; D009638:Norepinephrine / Q000097:blood; D012701:Serotonin / Q000097:blood; D013045:Species Specificity; D013312:Stress, Physiological / Q000097:blood*; D013696:Temperature
D001679:Biogenic Amines; D012701:Serotonin; D006632:Histamine; D004298:Dopamine; D009638:Norepinephrine