Abstract: [Objective] To systematically assess the nutrient composition characteristics of ground source protein feed resources in Zhejiang Province, and to accumulate data for the establishment of a database of ground source protein resources, soybean meal reduction and substitution actions and feed industry optimization in Zhejiang Province. [Methods] Fourteen kinds of ground source protein feedstuffs from Zhejiang Province were collected, and the resource characteristics were analyzed by determining the nutrient compositions of crude protein, crude fiber, and amino acid, combined with the analysis of variance （ANOVA） and correlation statistics. [Results] Crude protein content：rice bran meal was the lowest [（5.69±1.82）%], feather meal was the highest [（81.48±4.36）%], and defatted rice bran was the medium [（14.61±1.15）%]; crude fiber content：fish meal was the lowest [（2.70±1.28）%], rice bran meal was the highest [（26.97±15.14）%], and defatted rice bran was the medium [（8.91±0.66）%]. The crude fiber content of defatted rice bran showed significant difference （P<0.05） with rice bran meal and peanut meal; total amino acids content：rice bran meal was the lowest [（4.38±1.74）%], feather meal was the highest [（77.03±3.80）%], and defatted rice bran was medium [（11.86±1.06）%], and the total amino acid content of defatted rice bran was not significantly different （P>0.05） with wine lees, rice bran meal and wheat bran, and the difference with other varieties was significant （P<0.05）. There was a highly significant （P<0.01） negative correlation between crude protein content and crude fiber content, indicating that feedstuffs with higher protein content usually have lower fiber content; there was a highly significant （P<0.01） positive correlation between crude protein content and total amino acid content, indicating that feedstuffs with higher protein content contain higher amino acids. There was a highly significant （P<0.01） negative correlationbetween crude fiber content and total amino acids content, and a significant （P<0.05） negative correlation between crude fiber content and crude ash content. There was a significant （P<0.05） negative correlation between crude ash content and moisture content. [Conclusion] Defatted rice bran is an abundant ground source protein feed resource in Zhejiang Province. The effect of its high cellulose content on animal digestibility should be considered in application. Subsequently, through technological innovations such as fermentation technology, bacteria-enzyme synergy technology and low-temperature processing technology, the nutritional deficiencies of defatted rice bran are expected to be broken through, which has great development potential and application prospects.

Key words: feed, protein, amino acids, nutrient composition, evaluation