不同采食量和环境温度下生长肉鸡产热和呼吸商的昼夜变化。

Circadian variation in heat production and respiratory quotient in growing broilers maintained at different food intakes and ambient temperatures.

Koh K, MacLeod M G

Faculty of Agriculture, Shinshu University, Nagano, Japan.

Br Poult Sci. 1999 Jul;40(3):353-6. doi: 10.1080/00071669987449.

Abstract

Circadian variations in heat production (HP) rate and respiratory quotient (RQ) were measured in growing broilers maintained at 5 ambient temperatures (14 degrees, 17 degrees, 22 degrees, 27 degrees and 32 degrees C) and at 5 rates of feeding [ad libitum intake and 75%, 50%, 25% and 0% (fasting) of ad libitum intake]. 2. In most cases, the HP rate decreased from 10.30 h just after food was given) until 00.30 h (the 1-h dark period), showed an overshoot just after the 1-h dark period and then changed little. 3. Circadian variation in RQ, except in the fasted group, showed a similar pattern, which consisted of increase, decrease and constant phases. 4. Food intake affected the pattern of circadian variation in RQ, although ambient temperature had little effect. Possible effects of food intake on the pattern of circadian variation in HP rate were discussed.

摘要

在5种环境温度（14摄氏度、17摄氏度、22摄氏度、27摄氏度和32摄氏度）以及5种采食量水平[自由采食以及自由采食量的75%、50%、25%和0%（禁食）]条件下，对生长中的肉鸡产热率（HP）和呼吸商（RQ）的昼夜变化进行了测定。2. 在大多数情况下，产热率从喂食后10:30（刚喂食后）开始下降，直至00:30（1小时黑暗期），在1小时黑暗期刚结束后出现一个峰值，然后变化不大。3. 除禁食组外，呼吸商的昼夜变化呈现相似模式，包括上升、下降和稳定阶段。4. 采食量影响呼吸商昼夜变化模式，而环境温度影响较小。文中讨论了采食量对产热率昼夜变化模式可能产生的影响。