不同比例低蛋白氨基酸平衡日粮对断奶仔猪生长性能及氮平衡的影响

为了解不同比例低蛋白氨基酸平衡日粮对断奶仔猪生长性能及氮平衡的影响,试验将96头初始体重9.8 kg左右的杜×长×大断奶仔猪随机分成4个处理,每个处理分别饲喂含不同蛋白水平的玉米-豆粕型饲粮(20%CP、19%CP、18%CP和17%CP),通过补充合成氨基酸,使各处理组的氨基酸与要求相一致。正式试验期为28 d,测定断奶仔猪生长性能、氮平衡指标。结果表明,日粮蛋白水平降至18%时,不会影响断奶仔猪生长性能,且显著降低尿氮、粪氮和总氮排放量(P<0.01);但随着日粮蛋白水平进一步降至17%时,显著降低仔猪平均日增重(P<0.01),显著增加料重比(P<0.01);18%CP组与17%CP组总氮排放量、氮表观利用率、氮表观生物学效价差异不显著(P>0.05)。说明添加合成氨基酸满足断奶仔猪需要,将日粮蛋白水平降至18%,不仅不会影响仔猪生长性能,而且还会降低氮排放,减少环境污染。

Effects of Different Proportions of Low Protein and Amino Acid Balanced Diets on Growth Performance and Nitrogen Balance in Weaned Piglets

In order to understand the effect of different ratios of low protein and amino acid balanced diets on growth performance and nitrogen balance of weaned piglets, 96 Duroc×Landrace×Yorkshire weaned piglets with an initial weight of about 9.8 kg were randomly divided into 4 treatments, each treatment was the corn-soybean meal diets(20% CP, 19% CP, 18% CP, and 17% CP)containing different protein levels were fed, and the amino acids in each treatment group were consistent with the requirements by supplementing synthetic amino acids. The formal test period was 28 days, and the growth performance and nitrogen balance index of weaned piglets were measured. The results showed that when the dietary protein level was reduced to 18%, it did not affect the growth performance of weaned piglets, and significantly reduced urine nitrogen, fecal nitrogen, and total nitrogen emissions(P<0.01). However, as the dietary protein level further decreased at 17%, the average daily weight gain of the piglets was significantly reduced(P<0.01), and the feed-to-weight ratio was significantly increased(P<0.01). The total nitrogen emissions, apparent nitrogen utilization rate, and nitrogen table of the 18% CP group and the 17%CP group, there is no significant difference in biological titers(P>0.05). It shows that the addition of synthetic amino acids meets the needs of weaned piglets, and the dietary protein level is reduced to 18%, which will not only affect the growth performance of piglets, but also reduce nitrogen emissions and reduce environmental pollution.