不同加工方式对“双低”菜粕品质的影响

对 2个不同加工方式生产的中国“双低”菜粕A和B以及 1个加拿大卡诺拉菜粕进行了体外消化和肉鸡饲养及代谢试验 ,以评价其营养价值。体外消化试验结果表明 ,卡诺拉菜粕、样品A和样品B的可消化蛋白质含量分别为 73 .6%、59.0 %和 51 .0 %(P <0 .0 1 ) ;2周的肉鸡生长试验表明 ,试验各期生长速度、采食量和饲料转化率差异显著 (P <0 .0 5)或极显著 (P <0 .0 1 ) ;代谢试验结果表明氮沉积率组间差异显著 (P <0 .0 5)。过热处理时 ,与中性洗涤纤维相连的蛋白质消化率降低 (P <0 .0 1 ) ,是导致氮沉积率低和肉鸡生长性能差的直接原因。试验结果也表明 ,过热处理或热处理不足 ,都对“双低”菜籽饼粕质量产生严重影响。

Effect of Different Processing on the Quality of Double-low Rape-seed Meal

Studies involved in vitro and in vivo trials to evaluate the nutritional quality of 2 Chinese double|low rapeseed meal samples(A and B), one of which(A)was processed under an excessive heat using the roasting|expelling technology,another of which(B) was pre|press solvent exfacted using conventional mild heat treatment conditions, and also l Canadian Canola meal. In the in vitro trial, the digestible protein contents in the samples are 73.6%,59.0% and 51.0%, for Canola, A, B, respectively(P<0.01). The effects of inclusion 300 g.kg -1 of these samples in the conventional diets on the performance of the broiler chicks were examined in the second trial. Body weight gain, feed intake, and feed conversion efficiency differed much (P<0.05 or P<0.01) among the samples in every period of the trial. Meanwhile, nitrogen retention(NR) was higher in Canola and B than in A(P<0.05);NDF N digestibility was lowest in A(P<0.01), which resulted in the low NR and poor performance for broiler chicks in this treatment. It suggested that either overheated or under|heated processing be critical for the quality of double|low rapeseed meal.