22~42日龄肉仔鸡饲粮粗蛋白最低需要量的研究

发布时间：2018-09-07 18:56

【摘要】：通过饲养试验和氮代谢试验,研究22~42日龄肉仔鸡玉米-豆粕型饲粮中粗蛋白的最低需要量。将360只22日龄AA肉仔鸡公雏鸡按体重分6个处理组,每个处理组10个重复笼,每个重复笼6只鸡,分别饲喂粗蛋白实测水平为19.87%(对照组)、18.84%、17.63%、16.81%、15.75%和14.88%的玉米-豆粕型饲粮21 d。第38~42日龄进行氮代谢试验。结果表明:饲粮粗蛋白水平显著影响日增重、耗料增重比、腹脂率、胸肌滴水损失、L*和a*值、腿肌a*和b*值、血清总胆固醇、甘油三酯、尿酸、新城疫抗体效价、氮排放和氮表观利用率(P0.05)。当饲粮粗蛋白水平由19.87%降至17.63%时,上述指标与对照组无显著差异(P0.05),但显著降低粪便氮排放(P0.05);当饲粮粗蛋白水平进一步降低至16.81%及以下时,肉鸡的日增重显著降低(P0.05),而耗料增重比显著提高(P0.05),腹脂率、胸肌滴水损失、血清总胆固醇和甘油三酯显著增加(P0.05),新城疫抗体效价显著降低。建议22~42日龄肉仔鸡玉米-豆粕型饲粮中粗蛋白最低需要量以17.63%为宜。
[Abstract]:The minimum requirement of crude protein in the corn-soybean meal diet of 22 ~ 42-day-old broiler was studied by feeding experiment and nitrogen metabolism test. Three hundred and sixty 22-day-old AA broiler chicks were divided into 6 groups according to their body weight, 10 cages in each treatment group and 6 chickens in each repeated cage. The measured crude protein levels were 19.87% (control group) and 16.81% (15.75% and 14.88%) of corn-soybean meal diet for 21 days, respectively. Nitrogen metabolism test was carried out at the age of 38 ~ 42 days. The results showed that dietary crude protein level had significant effects on daily gain, feed gain ratio, abdominal fat rate, pectoralis drop loss, leg muscle A * and b *, serum total cholesterol, triglyceride, uric acid, Newcastle disease antibody titer. Nitrogen emission and apparent nitrogen utilization efficiency (P0.05). When the dietary crude protein level decreased from 19.87% to 17.63%, the above indexes were not significantly different from those of the control group (P0.05), but significantly decreased the fecal nitrogen emissions (P0.05), and when the dietary crude protein level further decreased to 16.81% and below, The daily gain of broilers decreased significantly (P0.05), while the ration of feed consumption increased significantly (P0.05), abdominal fat rate, pectoralis drop loss, serum total cholesterol and triglyceride increased significantly (P0.05), and the titer of Newcastle disease antibody decreased significantly. It was suggested that the minimum requirement of crude protein in the corn-soybean meal diet of 22 ~ 42 days old broilers should be 17.63%.
【学位授予单位】：河北科技师范学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S831.5

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