Effect of environmental temperature on muscle protein turnover and heat production in tube-fed broiler chickens
Effect of environmental temperature on muscle protein turnover and heat production in tube-fed broiler chickens
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DOI：
10.1079/bjn19970088
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发表时间：
1997-06-01
影响因子：
3.6
通讯作者：
Tomita, Y
中科院分区：
文献类型：
--
作者：
Yunianto, VD;Hayashi, K;Tomita, Y
本实验旨在研究环境温度对管饲完整雄性肉鸡生长、腹部脂肪含量、肌肉蛋白质周转率和产热的影响。还检查了甲状腺素（T-4）、三碘甲状腺原氨酸（T-3）和皮质酮（CTC）的血浆浓度。将15日龄雏鸡置于不同环境温度（16、19、22、25、28、31、34 ℃）下饲养，在12 d的试验期内每天3次管饲试验日粮（200 g粗蛋白/kg，13.57 MJ/kg代谢能）。在炎热的条件下，除了34度，体重增加显着高于在寒冷的条件下。因此，当鸟类暴露在34度以外的高温条件下时，食物转化率（食物：增益比）较低。同样，腹部脂肪含量显着增加，并且在34度以外的热条件下保持的组中产热较低。骨骼肌蛋白质周转率和血浆CTC浓度下降时，鸟类暴露于热条件以外的34度，表明CTC在肌肉蛋白质周转的调节作用。血浆T-4和T-3浓度随环境温度升高而显著降低。这些结果清楚地表明，甲状腺激素和CTC的血浆浓度与加速的肌肉蛋白质周转和产热有关。
The present experiments were undertaken to investigate the effects of environmental temperatures on growth, abdominal fat content, rate of muscle protein turnover, and heat production in tube-fed intact male broiler chickens. Plasma concentrations of thyroxine (T-4), triiodothyronine (T-3), and corticosterone (CTC) were also examined. Chicks (15 d old) were kept at different environmental temperatures (16, 19, 22, 25, 28, 31, and 34 degrees) and given the experimental diet (200 g crude protein/kg, 13.57 MJ/kg metabolizable energy) by tube three times daily throughout the 12 d experimental period. In the hot conditions, except for 34 degrees, body-weight gain was significantly higher than in the cold conditions. Thus, food conversion ratios (food:gain ratios) were lower when the birds were exposed to the hot conditions other than 34 degrees. Likewise, abdominal fat content was significantly increased, and heat production was lower in the groups kept under the hot conditions other than 34 degrees. The rate of skeletal muscle protein turnover and plasma concentration of CTC were decreased when the birds were exposed to hot conditions other than 34 degrees, suggesting a role of CTC in the regulation of muscle protein turnover. Plasma concentrations of T-4 and T-3 were significantly decreased as environmental temperature increased. These results clearly show that plasma concentrations of thyroid hormones and CTC are associated with accelerated muscle protein turnover and heat production.