|
Effects of nicarbazin and hot temperature on evaporatative water loss, acid-base balance, body temperature and carbin dioxide exhalation in adult roosters |
|
B. D. Lee, S. K. Lee, W. J. Hyun |
|
|
|
|
|
|
| Abstract |
|
Two experiments were conducted to study the effect of ambient temperature and nicarbazin on SCWL adult roosters. In Experiment 1, the effects of nicarbazin supplementation (125 ppm) on the water metabolism, blood acid-base balance; and rectal temperature of 16 birds in normal (21째C) and hot (35-36째C) temperature were investigated. In Experiment 2, the evaporative water loss and CO2 exhalation from 8 birds were measured individually with an open-circuit gravimeric respiration apparatus in normal (21째C) and hot (33.5-34째C) temperature. The amount of water intake and evaporative water loss increased in birds under heat stress (HS). Nicarbazin exacerbated these effect in hot temperature. Also, nicarbazin decreased the blood pCO2 and increased pH of HS birds. The rectal temperature of birds increased in hot temperature, and nicarbazin worsened this effect. The evaporative water loss, measured directly with respiration apparatus (Experiment 2), was increased in hot temperature. HS decreased the amount of CO2 exhalation. Nicarbazin did not exert ant effect on either of these measurements, probably due to the limited duration (2 h) of the trial. The decrease in CO2 exhalation by HS birds could be explained by reduced metabolic rate, which helps homeothermy of birds in hot temperature. (Key Words: Heat Stress, Nicarbazin, Water Balance, Acid-Base Balance, Carbon Dioxide Exhalation, Adult Rooster) |
| Keywords:
Heat Stress; Nicarbazin; Water Balance; Acid-Base Balance; Carbon Dioxide Exhalation; Adult Rooster |
|
PDF Links
Full text via DOI
Download Citation
