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为搞清鲤鱼饲料中最佳能量蛋白比[可消化能(DE,千焦/公斤饲料)与蛋白质(P.％)之比:D E/P]进行了饲养试验,方法是给鲤鱼投喂含营养量不等的[蛋白质(22％～41％)、碳水化合物(5％～50％)和类脂(5％～15％)]各种配合饲料,结果表明,不管饲料中的DE如何,喂蛋白质含量23％饲料的鱼,其生长速度和喂养变化相当慢。当饲料的DE达1298～1507千焦/100克、蛋白质含量达31％～32％时,生长速度最快。使用碳水化合物或类脂把饲料中的DE从1298千焦提高到1292千焦,其生长速度、饵料系数等没什么变化。喂消化能量小于1298千焦的饲料时,PER(饲料蛋白质的蛋白效率)和NPU(净蛋白利用率)值低得多。不管饲料中消化能量比或鱼的生长情况如何,鲤鱼体中能量转化率在32％～49％。另外能量消化率与饲料的纤维素含量呈线性关系,随着饲料纤维素含量的增加而减小。根据试验结果分析数据推测,鲤鱼生长所需饲料的最佳蛋白质含量是31％左右,据消化能的测定,生长所需最佳的能量蛋白比(DE/P)的试验值是406～486。
In order to clarify the best energy protein ratio in carp diets [ratio of digestible energy (DE, kJ / kg diet) to protein (P.%): DE / P] The results showed that irrespective of the amount of DE in the feedstuffs, different amounts of nutrients (22% to 41% of protein, 5% to 50% of carbohydrates and 5% to 15% of lipids) Feed fish with protein content of 23%, the growth rate and feeding changes quite slowly. When the feed DE reached 1298 ~ 1507 kJ / 100 grams, the protein content of 31% to 32%, the fastest growth. Using carbohydrates or lipids to increase the DE in the feed from 1298 kJ to 1292 kJ, there is little change in growth rate, feed composition, etc. PER (feed protein protein efficiency) and NPU (net protein utilization) values were much lower when feed with a digestible energy of less than 1,298 kJ. Regardless of the digestible energy in the feed or the growth of the fish, the energy conversion rate of the carp body is between 32% and 49%. In addition, the energy digestibility and dietary cellulose content has a linear relationship, with the feed cellulose content decreases. According to the results of the analysis of the test data, the optimum protein content of the diet required for carp growth is about 31%. According to the determination of digestive energy, the best DE / P value for growth is 406 ~ 486.