Apparent digestibility of 10 feed ingredients for Chinese mitten crab Eriocheir sinensis

Apparent digestibility coefficients(ADCs) of crude protein,energy and amino acids in fish meal,blood meal,hydrolyzed feather meal,meat meal,shrimp meal,meat-bone meal,corn gluten meal,cottonseed meal,peanut meal and fine rice bran were determined for Eriocheir sinensis(63.72±1.67 g),using a reference diet with 0.5% Y2O3 indicator and test diets that contained 70% reference diet and 30% feed ingredient.The results showed that the ADC of animal protein was higher than the plant protein except hydrolyzed feather meal and meat-bone meal.In the animal protein sources,the ADC of crude protein of blood meal and shrimp meal were higher than fish meal(P0.05),and the ADC of energy of blood meal,meat meal and shrimp meal were higher than that of fish meal(P0.05),the highest crude protein digestibility coefficient observed in blood meal(94.19%),followed by shrimp meal(90.53%) and meat meal(86.24%).The highest energy digestibility coefficient was recorded for blood meal(86.05%),followed by meat meal(85.33%) and shrimp meal(82.45%).The lowest crude protein and energy digestibility coefficient both showed in meat-bone meal.In these plant protein sources,the crude protein digestibility coefficient of cottonseed meal(85.99%) was the highest,followed by peanut meal(82.01%).The lowest was corn gluten meal(71.35%),the energy digestibility coefficient was recorded for peanut meal(71.52%),followed by corn gluten meal(68.10%) and cottonseed meal(51.35%),and fine rice bran(40.99%) was the lowest.The ADC of amino acids had a similar tendency with the ADC of crude protein except meat meal and fine rice bran.Except hydrolyzed feather meal(73.63%) and meat-bone meal(79.13%),the ADC of all ingredients was between 80.71% and 89.94% and rate exceeding 89.94% was recorded in blood meal.Animal protein sources of blood meal,meat meal and shrimp meal,and plant protein sources of cottonseed meal,peanut meal and fine rice bran can be used as the protein source for the feed of Chinese mitten crab.However,the ADC of meat-bone meal,hydrolyzed feather meal,and corn gluten meal was low,therefore they were not suitable for Chinese mitten crab as dietary protein sources.