Effect of acute heat stress on plasma amino acids concentration of broiler chickens
2000
Tabiri, H.Y. (Tohoku Univ., Sendai (Japan)) | Sato, K. | Takahashi, K. | Toyomizu, M. | Akiba, Y.
The present study was conducted to investigate the effect of acute heat stress (HS) of differing temperatures (36, 38 and 40 degrees C) on plasma amino acids concentration of 3-weeks -old broiler birds. Birds were exposed to each temperature and subjected to blood sampling at 0, 30, 60 and 180 min after the exposure. Exposure of chickens to 38 and 40 degrees C caused elevation of core temperature compared with their 0 min values until those maintained in the 40 degrees C died shortly after 60 min post-HS. At all temperatures, concentrations of plasma Asp, Ser, Tyr and Cys were significantly decreased by the HS compared to their 0 min level. On the other hand, plasma Trp and Trp/LNAA were increased in birds kept at 36 and 38 degrees C at 30 min post-HS before returning to their 0 min concentrations. Changes in some amino acids were clearly temperature-specific. We speculate that changes in plasma Tyr concentration and Trp/LNAA ratio may be related to some of the metabolic responses together with reduced performance observed in HS birds
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