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首页> 外文期刊>Fish Physiology and Biochemistry >The specific dynamic action of southern catfish, Silurus meridonalis Chen, fed diets containing either raw or precooked corn starch or glucose
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The specific dynamic action of southern catfish, Silurus meridonalis Chen, fed diets containing either raw or precooked corn starch or glucose

机译：南部cat鱼Silurus meridonalis Chen喂食含有未加工或预煮玉米淀粉或葡萄糖的饲料的具体动态作用

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摘要

The growth performance of carnivorous southern catfish (Silurus meridionalis) was lower when fed a diet containing glucose as a carbohydrate source than when fed one containing starch. To test whether this decreased growth performance was partly due to higher metabolic costs induced by the fast assimilation of dietary glucose, the postprandial metabolic responses of southern catfish juvenile (36.7 ± 1.9 g) fed diets containing either raw or pre-cooked corn starch and glucose were investigated at 27.5°C. The peak metabolic rate of fish fed a raw corn starch diet was significantly higher than that of fish fed precooked corn starch and glucose diets (P < 0.05). The specific dynamic action (SDA) coefficients (energy expended on SDA as a percentage of energy content of the meal) of fish fed raw or precooked corn starch diets were significantly higher than that of fish fed a glucose diet (P < 0.05). The postprandial metabolic rate of fish fed a raw starch diet displayed a classic response – increased metabolic rate immediately after feeding, followed by a decreased metabolic rate several hours after feeding – as has been documented earlier in this species. However, the postprandial metabolic rate of fish fed a glucose diet had two alternating cycles of increasing and decreasing metabolic rate, which has not been reported previously. This bimodal pattern of the SDA curve was also found in a subsequent experiment in which purified d-glucose (0.1 g dry mass) was packed into sections of grass carp (Ctenopharyngodon idellus) intestine (0.05 g dry mass). The results suggest that the digestibility and absorption speed of the dietary carbohydrate has a significant effect on postprandial metabolic response in juvenile southern catfish. The results of this study may provide useful data in terms of the utilization of dietary carbohydrates by carnivorous fishes.
机译：当饲喂含有葡萄糖作为碳水化合物源的日粮时，食肉南部cat鱼（Silurus meridionalis）的生长性能要低于饲喂含淀粉的鱼。为了测试这种生长性能的下降是否部分归因于日粮葡萄糖的快速同化引起的更高的代谢成本，南方fish鱼幼鱼（36.7±1.9 g）的饲粮中含有未加工或预煮玉米淀粉和葡萄糖的餐后代谢反应在27.5℃下进行了研究。饲喂生玉米淀粉日粮的鱼的峰值代谢率显着高于饲喂预煮玉米淀粉和葡萄糖日粮的鱼（P <0.05）。饲喂生的或预煮的玉米淀粉日粮的鱼的特定动态作用（SDA）系数（SDA消耗的能量占膳食能量的百分比）显着高于饲喂葡萄糖日粮的鱼（P <0.05）。饲喂原始淀粉饮食的鱼的餐后代谢率表现出典型的反应-饲喂后立即增加代谢率，而饲喂后数小时则降低了代谢率-如该物种先前所证明的。然而，喂食葡萄糖饮食的鱼的餐后代谢率具有两个交替的增加和减少代谢率的循环，这以前没有报道。在随后的实验中也发现了SDA曲线的这种双峰模式，其中将纯化的d-葡萄糖（0.1 g干重）装入草鱼（Ctenopharyngodon idellus）肠（0.05 g干重）的切片中。结果表明，饮食中碳水化合物的消化率和吸收速度对南方southern鱼的餐后代谢反应具有显着影响。这项研究的结果可能为食肉鱼类利用膳食碳水化合物提供有用的数据。

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