尿素饲料不同处理方法的筛选

本研究采用人工瘤胃法和瘤胃尼龙袋法,分别测定了经不同处理尿素饲料的氨氮释放和粗蛋白质消失率,并对饲喂尿素饲料的绵羊瘤胃液的理化指标进行了分析。结果表明:甲醛和膨润土处理尿素均能延缓氯的释放,两者人工瘤胃发酵液中平均氨氮浓度比未处理的对照组分别降低29.73％和33.41％;粗蛋白质从瘤胃尼龙袋的消失率也比对照组有所降低。饲喂尿素饲料,瘤胃液PH值在正常生理范围内变动(6.29-7.46)。甲醛和膨润土混合处理,同时加入腐植酸钠和硫酸钠,可使体内瘤胃液中氨氮浓度从31.93mg/100m1降低到19.18mg/100ml,三氟乙酸沉淀蛋白的含量提高24.37％。

SELECTION OF METHODS FOR THE DIFFERENT TREATMENTS OF UREA-SUPPLEMENTED DIET

The artificial rumen and nylon bag technigues were used in measuring the ammonia release and crude protein disappearance rate of urea-supplemented diet treated by different methods, The physical and chemical indexes of the rumen liquid of sheep fed the diet were also examined. The results indicated that the treatments by formaldehyde or bentonite could decrease ammonia release rate. The mean concentration of NH_3-N in the rumen liquid coataining these two feed samples treated by the two chemicals were 29.73% and 33.41% respectively, being lower than that of the control. The disappearance rate of crude protein from nylon bags were also lower than that of control group. The PH values in the rumen liquid were within the normal physiological range (6.29-7.46). The treatment by formaldehyde and bentonite, folowing the addition of sodium humate and sodium sulphate, could decline the concentra- tion of NH_3-N in the tureen liquid from 31.93mg to 19.18mg/100ml and in- crease TCA-Precipitated protein outputs by 24.73%.