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首页> 外文期刊>African Journal of Biotechnology >Effects of different levels of protein-to-energy ratios on nutrient digestibility and digestive enzyme activity in Leiothrix luteal
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Effects of different levels of protein-to-energy ratios on nutrient digestibility and digestive enzyme activity in Leiothrix luteal

机译：不同水平的蛋白质/能量比对黄粉鱼的营养消化率和消化酶活性的影响

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摘要

Effects of different levels of protein-to-energy ratios (PER) on nutrient utilization, digestive organs index and digestive enzymes activities in?Leiothrix luteal?were investigated in this research. It was found that different PER feedstuff had no significant effects on the utilization of?dry matter?(DM), calcium (Ca) and?total phosphorus?(TP). With the improvement of the PER,?average daily feed intake?(ADFI)gradually increased, the apparent utilization rate of energy and fat gradually improved, while the apparent utilization rate of crude protein increased at first and then decreased. Development of digestive organs of?L. luteal?was affected by the level of dietary PER, with the increase in PER, the digestive organ indices of muscular stomach, duodenum, jejunoileum and rectum exhibited a downward trend, the main influencing factors were the level of metabolizable energy in diets. With the intestinal tract moving backward, the relative activity of proteases gradually reduced, manifesting as pancreas > duodenum > jejunoileum. The relative activity of carbohydrate digestion enzymes gradually increased as the intestinal tract moved backward. With the improvement of PER, the relative activity of lipase gradually decreased in pancreas, duodenum, and jejunoileum.?L. luteal?possessed a strong ability to digest crude fiber and total phosphorus; the reason might be closely related to the types and quantities of intestinal flora, which was affected by the feeding habits of this bird. By comprehensively considering the nutrient utilization, digestive organ indices and digestive enzymes activities, the formula of PER II was more appropriate for nutritional needs of?L. luteal?in captivity.
机译：本研究研究了不同水平的蛋白质/能量比（PER）对黄褐飞虱的养分利用，消化器官指数和消化酶活性的影响。结果发现，不同的PER饲料对干物质（DM），钙（Ca）和总磷（TP）的利用没有显着影响。随着PER的提高，“日平均采食量”（ADFI）逐渐增加，能量和脂肪的表观利用率逐渐提高，而粗蛋白的表观利用率先升高后降低。消化器官的发育黄体受到膳食PER的影响，随着PER的增加，肌肉胃，十二指肠，空肠和直肠的消化器官指数呈下降趋势，主要影响因素是饮食中的代谢能水平。随着肠道向后移动，蛋白酶的相对活性逐渐降低，表现为胰腺>十二指肠>空肠。随着肠道向后移动，碳水化合物消化酶的相对活性逐渐增加。随着PER的改善，胰腺，十二指肠和空肠中脂肪酶的相对活性逐渐降低。黄体具有很强的消化粗纤维和总磷的能力。原因可能与肠道菌群的类型和数量密切相关，而肠道菌群的种类和数量受此鸟的摄食习惯影响。通过综合考虑养分利用率，消化器官指标和消化酶活性，PER II的配方更适合？L的营养需求。黄体被圈养。

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