蛋白能量比对中华绒螯蟹蛋白酶活力和饲料消化率的影响

于１９９９年６～７月收集中华绒螯蟹（Ｅｒｉｏｃｈｅｉｒ ｓｉｎｅｎｓｉｓ）粪便，用酸不溶灰分法测定中华绒螯蟹对饲料的消化率，同时测定其胃、肠、肝胰脏蛋白酶活力。结果表明，蛋白质能量比（Ｐ／Ｅ）２８．９３ｍｇ／ｋＪ水平对中华绒螯蟹胃、肝胰脏蛋白酶活性明显高于Ｐ／Ｅ２７．３０ｍｇ／ＫＪ和３０．３１ｍｇ／ＫＪ水平饲料蛋白南、脂肪、能量和总表观消化率分别为８２．５７％、７７．５９％、８３．９４％和９６．９

Effects of protein to energy ration on protease activities and apparent digestibility for Eriocheir sinensis

The digestibilities of formulated diets were estimated by collecting the faeces of crab Eriocheir sinensis in laboratory. The results showed that at 28. 93 mg/kJ P/E (protein-energy ratio)level the apparent digestibilities of protein, lipid, energy and dry matter were 82. 57 %, 77. 59 %, 83. 94 % and 76. 98 %, respectively, which were higher than those at 27. 30 mg/kJ and 30. 31 mg/kJ P/E obviously (P < 0. 01 ), and reached the greatest at 28. 93 mg/kJ P/E level. However, P/E values had no signifficant effects on the activity of protease in intestine (P >0. 05 ). So using the apparent digestibility as a target, the optimum DP/DE(digestible protein/digestible energy) is 28. 93 mg/kJ.