猪血纤维蛋白和肝渣蛋白质的营养评价

EVALUATION OF PROTEIN QUALITY FOR PIG BLOOD FIBRIN AND LIVER RESIDUE

实验采用纯种Wistar大鼠,饲喂10％蛋白质水平的猪血纤维蛋白或肝渣蛋白质,以酪蛋白作为参考蛋白,并与普通饲料中主要的动物性蛋白质来源一鱼粉相比较。通过生长试验,氮代谢和恢复试验,观察到猪血纤维蛋白的营养价值较高,在某种程度上可与酪蛋白或鱼粉相比,可供进一步开发利用。而肝渣蛋白质的营养价值较低,仅能作饲料蛋白质的辅助来源。本实验还研究了不同蛋白质对大鼠肝微粒体混合功能氧化酶含量和活性的影响,并讨论了其意义。

Sixty Wistar rats were divided into 5 groups, 12 in each:1)Casein; 2) Fish powder (FP) ; 3) Fibrin; 4)Liver residue(LR) , 5)Nitrogen free(NF). The feeds for all groups of rats were at the level of 10% protein and at the same calories except NF. Growth test, nitrogen balance and recovery test were used and the levels of serum proteins and Hb were determined.The protein efficiency ratio (PER) of casein, FP, fibrin and LR were 1.90, 3.07, 2.61 and 1.28 respectively. Net protein ratio (NPR), apparent digestibility, true digestibility and net nitrogen ratio (NNR) were same as PER suggesting the protein quality of LR was low, FP was high and fibrin in the medium. The values of serum proteins also showed that 10% protein of LR could not maintain rats in health, but compared with casein and FP the nutritional quality of fibrin was high and could be used in feed industry or other products.The effects of proteins on hepatic microsomal enzyme were observed. The influence factors were discussed.