The study was conducted to investigate the apparent digestibility coefficients (ADC) of nutrients in commonly used protein sources for largemouth bass. A reference diet and test diets with 70% reference diet and 30% feedstuff were formulated with yttrium oxide as a digestibility indicator. Overall, the ADC of dry matter of tested protein ingredients was 69.5%–96.4%, and the ADC of dry matter in animal protein sources was significantly higher than in the other five plant protein sources. The ADC of crude proteins ranged from 89.1% to 97.3% for all tested feedstuffs. The ADC value of total amino acids in the tested ingredients is consistent with that of the protein. The ADC of crude lipid of tested ingredients ranged from 45.4% to 96.2%, and the lowest and highest values were observed in porcine haemoglobin powder and pet-grade poultry by-product meal, respectively. The ADC of total phosphorus of animal protein ingredients, except porcine haemoglobin powder, was significantly higher than that of plant protein ingredients, except fermented soybean meal. The results revealed the difference in availability of nutrients in plant and animal protein sources for largemouth bass, which could provide a theoretical basis for the selection of protein sources of commercial feed for largemouth bass.

中文翻译：

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大口黑鲈 (Micropterus salmoides) 十种蛋白质成分的表观消化率

该研究旨在调查大口黑鲈常用蛋白质来源中营养素的表观消化率 (ADC)。参考日粮和含有 70% 参考日粮和 30% 饲料的测试日粮配制时使用氧化钇作为消化率指标。总体而言，供试蛋白原料干物质ADC为69.5%～96.4%，动物蛋白源干物质ADC明显高于其他五种植物蛋白源。对于所有测试的饲料，粗蛋白的 ADC 范围为 89.1% 至 97.3%。被测原料总氨基酸ADC值与蛋白质一致。被测原料粗脂ADC值为45.4%~96.2%，最低和最高值分别出现在猪血红蛋白粉和宠物级家禽副产品粉中。除猪血红蛋白粉外，动物蛋白原料总磷ADC值显着高于植物蛋白原料（发酵豆粕除外）。研究结果揭示了大口黑鲈植物蛋白源和动物蛋白源的营养有效性差异，可为大口黑鲈商品饲料蛋白源的选择提供理论依据。