Institute of Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.
J Anim Physiol Anim Nutr (Berl). 2009 Aug;93(4):423-30. doi: 10.1111/j.1439-0396.2008.00821.x.
In a field study with fattening pigs, effects of feed particle size at the dietary presence of organic acids on Salmonella prevalence were measured. On two farms (f1/f2), each holding ∼800 pigs, diets based on finely ground (control) or coarsely ground ingredients (experiment) were fed as crumbs. On f1 both control and experimental grower and finisher diets contained identical concentrations of formic and propionic acid (0.4% and 0.2% respectively). On f2 only finisher diet of the experimental group contained 1.2% potassium diformate. At the start of the fattening period no statistical differences were measured between Salmonella prevalence in animals fed control and experimental diets on both farms. At slaughter Salmonella prevalence in caecal contents was lower (p < 0.05) on f1 in animals fed the experimental diet. Furthermore, the number of seronegative meat juice samples taken from these animals [optical density (OD) <10] was higher (p < 0.001); seropositive as well as distinct seropositive samples (OD ≥20 and ≥40 respectively) were less frequent (p < 0.01) compared to samples from animals fed the control diet. Feeding the experimental diet on f2 resulted in a lower Salmonella detection rate in faeces before slaughter (p < 0.01). Salmonella prevalence was lower in caecal content at slaughter for pigs fed the experimental diet compared to those fed control diet (p < 0.0001). The number of distinct seropositive meat juice samples (OD ≥40) was lower (p < 0.01) for pigs fed the experimental than for those fed the control diet. In comparison to pigs in the control group, starch concentrations in the caecal content from pigs in the experimental groups on both farms were higher (p < 0.05) and the pH values lower (p < 0.05). Propionate (p < 0.0001) and butyrate (p < 0.01) concentrations were higher in the caecal content taken from pigs in the experimental group on f2.
在一项针对育肥猪的田间研究中，测量了日粮中添加有机酸时饲料颗粒大小对沙门氏菌流行率的影响。在两个农场（f1/f2）中，每个农场饲养约 800 头猪，分别用细磨（对照）或粗磨成分（实验）制成的颗粒喂养。在 f1 中，对照和实验生长育肥猪和育肥后期猪日粮中均含有相同浓度的甲酸和丙酸（分别为 0.4%和 0.2%）。在 f2 中，实验组仅在育肥后期猪日粮中含有 1.2%的富马酸二甲酯。在育肥期开始时，在两个农场中，喂食对照和实验日粮的猪的沙门氏菌流行率没有统计学差异。在屠宰时，f1 中实验组日粮组的盲肠内容物中沙门氏菌的流行率较低（p<0.05）。此外，从这些动物采集的血清阴性肉汁样本数量较高（OD<10）（p<0.001）；血清阳性和明显血清阳性样本（OD 分别为≥20 和≥40）的频率较低（p<0.01），与喂食对照日粮的动物相比。在 f2 中喂食实验日粮可导致屠宰前粪便中沙门氏菌检测率降低（p<0.01）。屠宰时实验组日粮组猪盲肠内容物中沙门氏菌的流行率低于对照组（p<0.0001）。与喂食对照日粮的猪相比，喂食实验日粮的猪的血清阳性肉汁样本数量（OD≥40）较低（p<0.01）。与对照组猪相比，两个农场实验组猪盲肠内容物中的淀粉浓度较高（p<0.05），pH 值较低（p<0.05）。f2 实验组猪盲肠内容物中的丙酸（p<0.0001）和丁酸（p<0.01）浓度较高。
