Apparent digestibility coefficient of chickpea, maize, high-quality protein maize, and beans diets in juvenile and adult Nile tilapia ( Oreochromis niloticus )

ABSTRACT The objective of our study was to assess the apparent digestibility of plant ingredients in diets for juvenile (50 g) and adult (220 g) Nile tilapia (Oreochromis niloticus). Dietary dry matter and protein apparent digestibility coefficients of four plant-derived feedstuffs (chickpea, maize, high-quality maize protein, and beans) were tested. The beans diet had the lowest apparent digestibility coefficient of dry matter (ADCDM) (69.41%), while no significant differences were detected in ADCDM among the other diets; ADCDM was significantly higher in adults compared with juveniles (77.02 vs. 73.76%). Apparent dry matter digestibility coefficient of ingredients (ADCI) was significantly higher in the chickpea (70.48%) and high-quality protein maize (71.09%) ingredients, and lower in the beans (52.79%) ingredient. Apparent dry matter digestibility coefficient of ingredients was significantly higher in juveniles compared with adults (72.56 vs. 56.80%). The protein digestibility of diet (ADCCP) was significantly higher in the reference diet (93.68%), while the lowest corresponded to the maize (87.86%) and beans (87.29%) diets. Significantly lower apparent digestibility coefficient of protein (ADCICP ) was obtained with the high-quality maize protein (59.11%) and maize (49.48%) ingredients, while higher ADCICP was obtained with the chickpea and beans ingredients (71.31 and 63.89%, respectively). The apparent digestibility coefficient of ingredient crude protein ADCICP was significantly higher in juveniles compared with adults (67.35 vs. 53.46). Digestibility is generally higher in juveniles, and we recommend using chickpea as an ingredient in diets for Nile tilapia.

【摘要】本研究旨在评估四种植物源性饲料原料（鹰嘴豆、玉米、优质玉米蛋白及菜豆）在日粮中对体质量50g的幼龄尼罗罗非鱼（Oreochromis niloticus）与体质量220g的成年尼罗罗非鱼的表观消化率。本试验测定了对应试验日粮的干物质表观消化率系数（apparent dry matter digestibility coefficient, ADCDM）与蛋白质表观消化率系数。结果显示，菜豆组日粮的ADCDM最低，为69.41%，其余各组日粮的ADCDM未检测到显著差异；成年鱼的ADCDM显著高于幼鱼（77.02% vs. 73.76%）。原料干物质表观消化率（apparent dry matter digestibility coefficient of ingredients, ADCI）在鹰嘴豆组（70.48%）与优质玉米蛋白组（71.09%）中显著更高，菜豆组（52.79%）则显著更低；幼鱼的ADCI显著高于成年鱼（72.56% vs. 56.80%）。参考日粮的蛋白质表观消化率系数（apparent digestibility coefficient of diet protein, ADCCP）最高，达93.68%，最低值见于玉米组与菜豆组日粮，分别为87.86%与87.29%。优质玉米蛋白与玉米原料的粗蛋白质表观消化率系数（apparent digestibility coefficient of ingredient crude protein, ADCICP）显著更低，分别为59.11%与49.48%；鹰嘴豆与菜豆原料的ADCICP则更高，分别为71.31%与63.89%。幼鱼的ADCICP显著高于成年鱼（67.35% vs. 53.46%）。总体而言，幼鱼的表观消化率普遍更高，本研究推荐将鹰嘴豆作为尼罗罗非鱼日粮的饲料原料。