长吻对鱼粉等六种商品饲料中粗蛋白和能量的消化率

本试验以三氧化二铬（Ｃｒ２Ｏ３）为指示物测定Ⅰ龄长吻对鱼粉、猪血粉、豆饼粉、菜籽饼粉、小麦粉和玉米蛋白粉等六种商品饲料原料粗蛋白和总能量的消化率。试验饲料由参考饲料和试验原料以７０∶３０的比例混合挤压制成颗粒饲料。试验鱼粪便样品用虹吸方式收集，并将测试的消化率结果经过降低１０％的校正。由此所得消化率值更能反应长吻的消化生理状况。另外本文对六种饲料的消化率结果进行了讨论。

APPARENT DIGESTIBILITY COEFFICIENT OF CRUDE PROTEIN AND ENERGY FOR SIX COMMERCIAL FEED INGREDIENTS FOR CHINESE LONG-SNOUT CATFISH

Using the chromic oxide (Cr2O3) as an indicator, the apparent digestibility coefficients of crude protein and energy for fish meal, blood meal, soybean meal, rape cake meal, wheat meal and corn protein meal were determined for one-year old Chinese long-snout catfish (Leiocassis longirostris Gunther). The tested diet was a pelleted mixture of 70% referentce diet and 30% feed ingredient. The fecal samples were collected by using the siphon technique. The apparent digestibility coefficients of reference diet and test diets were reduced by 10%. The digestibility determined by this method is in more agreetment with the fish digestion physioloy as compared to the other methods used. The apparent digestibility coefficients of six ingredients are discussed in this paper.