壳聚糖对肉仔鸡生长性能和免疫器官指数的影响

本试验将120只健康1日龄肉仔鸡（公、母混合）随机分成5组,每组设4个重复,每个重复6只鸡.在各组基础饲料中分别添加0、50、100、150mg/kg的壳聚糖,第5组在基础日粮中添加6mg/kg黄霉素.经42d的饲养试验,研究不同水平的壳聚糖对肉仔鸡生长性能及免疫器官指数的影响.结果表明：100mg/kg壳聚糖处理组与对照组比,显著提高肉仔鸡平均日增重并降低了料肉比（P〈0.05）.壳聚糖对肉鸡的免疫功能有所提高.     

益生素添加剂对肉仔鸡饲喂效果的研究

以蜡样芽胞杆菌制剂对艾维茵肉仔鸡进行饲喂试验，研究益生索对肉仔鸡生产性能及某些生理生化指标的影响，初步探讨益生索作用机理，结果发现，芽胞杆菌制剂在提高肉仔鸡成活率，改善生产性能方面起明显的正面作用。     

The Measurement of Muscle Protein Synthesis in Broilers with a Flooding Dose Technique: Use of 15N-Labelled Phenylalanine,GC-MS and GC-C-IRMS

Abstract

An experiment was carried out to measure fractional muscle protein synthesis rates (k _s ) in broilers with injection of a flooding dose of phenylalanine (1 ml/100 g body weight of 150 mM phenylalanine; 38 atom percent excess (APE) [¹⁵N]phenylalanine). K _s was calculated from the [¹⁵N] enrichment in phenylalanine of tissue-free and protein-bound phenylalanine using both gas chromatography mass spectrometry (GC-MS) and gas chromatography combustion isotope ratio mass spectrometry (GC-C-IRMS) for measurements after a 10 min isotope incorporation period.

The tertiary-butyldimethylsilyl (t-BDMS) derivatives of phenylalanine were used for gas chromatographic separation in both systems. GC-MS and GC-C-IRMS were calibrated for a range of 7 to 37 [¹⁵N]APE and 0 to 0.62 [¹⁵N]APE, respectively, and for sample sizes of 0.45 to 4.5 nmol phenylalanine and 7 to 40 nmol phenylalanine, respectively. Reproducibility of standards as a measure of precision varied from 0.06 to 0.29 [¹⁵N]APE and from 0.0004 to 0.0018 [¹⁵N]APE in GC-MS and GC-C-IRMS, respectively.

K _s was measured in the m. pectoralis major of broilers fed rye based diets (56%) which were provided either unsupplemented (-) or supplemented (+) with an enzyme preparation containing xylanase. K _s in breast muscles was significantly increased from 21.8%/d to 23.9%/d due to enzyme supplementation.

It can be concluded from the study that the measurement of protein synthesis in broilers with the flooding dose technique can be carried out by using [¹⁵N]phenylalanine, GC-MS and GC-C-IRMS.     

添加维生素E、维生素C对鸡抗热应激力的影响

研究日粮中不同水平的维生素E、维生素C对肉仔鸡抗热应激力的影响.结果表明,在日粮中添加50mg/kg维生素E、200 mg/kg维生素C或200mg/kg维生素E、50 mg/kg维生素C可提高肉仔鸡热应激状态下的生产性能(降低死亡率、改善饲料报酬、体增重等);日粮中添加50 mg/kg维生素E、200mg/kg维生素C,对缓解热应激力时肉仔鸡血清总蛋白浓度升高效果明显;日粮中添加200mg/kg维生素E、50 mg/kg维生素C对维持热应激时肉仔鸡血脂的稳定效果较好;在日粮中添加50 mg/kg的维生素E和等量的维生素C对维持热应激时肉仔鸡血糖的稳定,效果较好.     

肉鸡产品质量安全短信息追溯平台的设计

为了提升肉鸡产品的质量安全管理水平,将农产品的可追溯理论与手机短信息技术相结合,以单口短信猫作为短信硬件设备,C#为开发语言,Microsoft SQL Server 2005为数据库管理系统,在Microsoft Visual Studio2008集成开发环境下,运用多队列与线程池的处理机制开发了基于短信息的肉鸡产品质量安全追溯平台。该平台将肉鸡产品的孵化、饲养、屠宰、储运、销售、检验检疫各环节的信息有机地联系在一起,实现了肉鸡产品的质量安全短信可追溯功能。设计过程中采用了多层、泛化的设计模式,可在其他农产品短信追溯系统中实现代码复用。     

新型复合添加剂对肉鸡增重效果的影响

本实验在基础饲粮中按0.5%、1.0%、1.5%的比例添加新型复合添加剂,进行了42d的肉鸡饲养试验。结果表明:添加新型复合添加剂均能不同程度地促进肉鸡的增重效果,减少死淘数,提高成活率和饲料报酬,降低饲养成本,增加经济效益。但以添加5%中新型复合添加剂试验3组的效果最好。