Izat A L, Tidwell N M, Thomas R A, Reiber M A, Adams M H, Colberg M, Waldroup P W
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville 72701.
Poult Sci. 1990 May;69(5):818-26. doi: 10.3382/ps.0690818.
A buffered propionic acid (BPA) was added to broiler diets fed in floor pens with litter. The BPA was fed continuously at 0, .2, .4, and .8% in Trial 1 and at 0 and .4% in Trial 2. The BPA was also fed at .4% for the last 7 days in Trial 2. Natural salmonellae exposure versus periodic dosage with Salmonella typhimurium was compared in Trial 2. In Trial 1, the BPA supplement had no adverse effects on growth, feed utilization, or abdominal fat with a significant (P less than or equal to .05) increase in the female dressing value at .8% of buffered propionic acid. The total number of coliforms and of Escherichia coli in the duodenum were significantly reduced by .4% BPA; in the jejunum, by all levels used in the trials; and in the ileum, by .4% and .8% of buffered propionic acid. The intestinal pH was not influenced by the BPA addition. In Trial 2, the BPA at .4% fed continuously had no adverse effect on growth, feed utilization, the abdominal fat of females, or the dressing percentage of males while significantly reducing the abdominal fat for males and increasing the dressing percentage for females. Feeding .4% BPA for the last 7 days had no effect on any of these parameters. Periodic dosage with S. typhimurium had no effect on body weight, feed utilization, or abdominal fat and significantly increased the dressing percentage. There was a significant interaction between the Salmonella dosage and the time of feeding BPA on dressing percentage.(ABSTRACT TRUNCATED AT 250 WORDS)
在垫料地面平养的肉鸡日粮中添加了缓冲丙酸（BPA）。在试验1中，BPA以0%、0.2%、0.4%和0.8%的比例持续添加；在试验2中，BPA以0%和0.4%的比例添加，试验2的最后7天还以0.4%的比例添加。试验2比较了自然暴露于沙门氏菌与定期投喂鼠伤寒沙门氏菌的情况。在试验1中，添加BPA对生长、饲料利用率或腹脂没有不良影响，当缓冲丙酸添加量为0.8%时，母鸡屠宰率显著（P≤0.05）提高。十二指肠中大肠菌群和大肠杆菌的总数在BPA添加量为0.4%时显著减少；空肠中，在试验中使用的所有添加水平下均显著减少；回肠中，在缓冲丙酸添加量为0.4%和0.8%时显著减少。添加BPA对肠道pH值没有影响。在试验2中，持续投喂0.4%的BPA对生长、饲料利用率、母鸡腹脂或公鸡屠宰率没有不良影响，同时显著降低了公鸡的腹脂并提高了母鸡的屠宰率。在最后7天投喂0.4%的BPA对这些参数均无影响。定期投喂鼠伤寒沙门氏菌对体重、饲料利用率或腹脂没有影响，但显著提高了屠宰率。沙门氏菌剂量与投喂BPA的时间对屠宰率有显著交互作用。（摘要截选至250词）
