| 摘要: |
| 将288羽21日龄艾维茵肉鸡分为6组，设计16%，18%和20%粗蛋白质（CP）不同水平,及其分别添加1 g/kg尿素（U）共构成6组日粮,随机分配给6组肉鸡，观测不同处理对肉鸡生产性能及血液生化指标的影响。结果表明：（1）随日粮CP水平提高，肉鸡采食量下降，16% CP及16% CP+U组显著高于其他组(P<0.05)；全期平均日增重以16% CP+U及18% CP组最高(P<0.05)；全期料肉比以16% CP和18% CP+U组最高(P<0.05)。（2）随日粮CP水平提高，肉鸡腹脂率下降，20% CP及20% CP+U组显著低于其他组(P<0.05)；胸肉率18% CP组显著高于16% CP,16% CP+U及20% CP+U组(P<0.05)；添加尿素腹脂率趋于降低（P>0.05）；20% CP+U组胸肉率显著降低(P<0.05)。（3）CP水平及添加尿素显著影响血清尿素氮(BUN)及血清总蛋白(BTP)。说明在本试验能量水平及氨基酸模式下，低蛋白质日粮（16%）加1 g/kg尿素可使肉鸡获得较好的生产性能。 |
| 关键词: 蛋白质水平 尿素 肉鸡 生产性能 |
| DOI： |
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| 基金项目:国家自然科学基金项目(39970550) |
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| Effect of dietary protein content and supplementation of urea on broiler's performance |
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| Abstract: |
| To investigate the effect of dietary protein content and supplementation of urea on the performance and blood biochemical index of broiler,288 Avin commercial broilers aged 21 d were divided into 6 groups.The 3 basal diets with 16%,18% and 20% crude protein (CP) and the same content of energy and main essential amino acids were designed.The other 3 diets were formed by supplementation of 1 g/kg urea (U) in diets of the 3 basal diets.The 6 diets were assigned to 6 groups at random.The results showed:1.With the increase of CP,feed intake (FI) decreased,FI of 16% CP and 16% CP+U were higher than that of other groups significantly (P<0.05);Weight gain of 16% CP+U and 18% CP were higher than that of other groups significantly (P<0.05);FCR of 16% CP and 18% CP+U were higher than that of other groups significantly (P<0.05);2.With CP increasing,the abdominal fat decreased.The abdominal fat rate of 20% CP and 20% CP+U were lower than other groups (P<0.05);The breast meat rate of 18% CP was higher than that of 16% CP and 16% CP+U and 20% CP+U (P<0.05).Supplementation urea in diets has the trend of lowering the abdominal fat rate(P>0.05).Diet with 20% CP plus 1 g/kg urea lowered the breast meat rate significantly (P<0.05);3.CP in diets and supplementation of urea affect BUN and BTP of broilers significantly.The conclusion is:1.Though the requirement of all essential amino acids can meet the needs of broilers,the moderate content of non-essential amino acid are needed in diet.2.Under the energy level and amino acid profile of this experiment,the diet with 16% CP will hinder the performance of broilers because of the deficiency of non-essential amino acid,but adding 1 g/kg urea could compensate this deficiency and make broiler achieve better performance. |
| Key words: protein content urea broiler performance |
