90 DLY cross bred pigs (32. 0 ±1. 5 kg) were randomly allocated into 5 groups, 3 replicates per group, 6 pigs in each replicate to investigate the effects of dietary protein and lysine on growth performance and nitrogen excretion in growing pigs. 2×2 factors were designed. Control group was fed with diet of 17. 47% crude protein (CP) and 0.80% digestible Lys ( Dly ) . 4 treatment groups was fed with diet of 15.46%, 13.49% CP and 0. 80%, 0. 85% Dly, respectively. The test duration was lasted for 50 days. The results showed that the treatment fed with diet of 15. 46% CP and 0. 80% Dly has not effect on the growth performance in growing pigs in comparison with others (P>0. 05) . but compared to the control, urinary nitrogen was significant decreased (P0. 05) compared to the others, urinary and feces nitrogen and total nitrogen was significant decreased (P0. 05) but at the same time nitrogen excretion is significant decreased in comparison with the diet of 17. 47% CP and 0.80% Dly (P<0. 05) .%将90头平均体重为(32.0±1.5)kg的杜长大三元杂交猪随机分为5个组,每组3个重复,每重复6头猪; 1组为对照组(粗蛋白质水平17.47％、可消化赖氨酸水平0.80％),2～5组为试验组,采用2×2因子设计,粗蛋白质水平为15.46％和13.49％与可消化赖氨酸水平为0.80％和0.85％.试验期50 d.结果:(1)日粮粗蛋白质水平15.46％、可消化赖氨酸水平0.80％,对猪的生长性能无影响(P＞0.05),尿氮排出量显著降低;当可消化赖氨酸水平增至0.85％时,猪的日增重显著提高(P＜0.05),尿氮、粪氮排出量显著降低.(2)日粮粗蛋白质水平13.49％、可消化赖氨酸水平0.80％,对猪的生产性能无影响,尿氮、粪氮及总氮排出量显著降低;当可消化赖氨酸水平增至0.85％时,影响猪的生长.结论:日粮粗蛋白质水平降低4个百分点,可消化赖氨酸水平保持0.80％不变,对生长猪生长性能无影响,氮排泄量显著降低.
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