The study focused on analysis and evaluation of microbial contamination of raw beef was designed to （1） determine the presence of foodborne pathogens in raw beef; （2） compare the prevalence of microbial contaminat...The study focused on analysis and evaluation of microbial contamination of raw beef was designed to （1） determine the presence of foodborne pathogens in raw beef; （2） compare the prevalence of microbial contamination among the three supermarkets, and （3） evaluate the sanitary quality of raw beef products. Also, six kind of microorganisms including Total Plate Count, Total Coliform and Fecal Coliform, which represented sanitary quality and E. coli, S. Aureus and B. cereus, which determined the presence of foodborne pathogens, were analyzed. The procedures used to analyse experimental samples taken from three supermarket （in every one week for three weeks） in Phnom Penh were based on Merck＇s study in 2005. The results had shown that there were no significant differences in Total Plate Counts, Total Coliform and Fecal Coliform in all samples, and they were found in unacceptable numbers in the raw beef products. However, the prevalence of foodborne pathogens including E. coli, S. aureus and B. cereus were found in acceptable numbers. Furthermore, the samples taken from the second supermarket had the highest level of microbial contamination among the three supermarkets, while the samples taken from the first supermarket had the lowest level of microbial contamination. This experimental finding demonstrated the need for sanitary improvement in the beef retails markets and strict sanitary guideline and implementation of these practices could guarantee consumers＇ health by consuming raw beefs with the lowest risk of foodborne pathogens.展开更多
试验旨在研究以棕榈粕为主要原料,以酿酒酵母菌和消化酶为发酵剂的发酵原料对肉牛生长性能、表观消化率及经济效益的影响。试验选用条件相近的育肥牛18头,随机等分成2组,对照组饲喂基础饲粮,试验组用棕榈粕发酵原料替代50%基础精料补充...试验旨在研究以棕榈粕为主要原料,以酿酒酵母菌和消化酶为发酵剂的发酵原料对肉牛生长性能、表观消化率及经济效益的影响。试验选用条件相近的育肥牛18头,随机等分成2组,对照组饲喂基础饲粮,试验组用棕榈粕发酵原料替代50%基础精料补充料,试验期共95 d。结果显示:①与对照组相比,试验组平均日增重(ADG)提高11.51%(P<0.01),平均料重比(F/G)降低9.48%(P<0.01);②试验组酸性洗涤纤维(ADF)、淀粉的表观消化率显著高于对照组(P<0.05);中性洗涤纤维(NDF)的表观消化率极显著高于对照组(P<0.01);粪便分析筛测试结果表明,试验组筛上层残留物质比例极显著低于对照组(P<0.01),下层残留物质比例显著低于对照组(P<0.05),中间层残留物质比例极显著高于对照组(P<0.01);③试验组与对照组相比,每千克增重的饲料成本降低13.66%(15.74元/kg vs 13.59元/kg),毛利润提高29.44%。研究结果表明,棕榈粕发酵原料对肉牛生长性能、消化代谢、经济效益等方面有较好的改善和提升作用。展开更多
文摘The study focused on analysis and evaluation of microbial contamination of raw beef was designed to （1） determine the presence of foodborne pathogens in raw beef; （2） compare the prevalence of microbial contamination among the three supermarkets, and （3） evaluate the sanitary quality of raw beef products. Also, six kind of microorganisms including Total Plate Count, Total Coliform and Fecal Coliform, which represented sanitary quality and E. coli, S. Aureus and B. cereus, which determined the presence of foodborne pathogens, were analyzed. The procedures used to analyse experimental samples taken from three supermarket （in every one week for three weeks） in Phnom Penh were based on Merck＇s study in 2005. The results had shown that there were no significant differences in Total Plate Counts, Total Coliform and Fecal Coliform in all samples, and they were found in unacceptable numbers in the raw beef products. However, the prevalence of foodborne pathogens including E. coli, S. aureus and B. cereus were found in acceptable numbers. Furthermore, the samples taken from the second supermarket had the highest level of microbial contamination among the three supermarkets, while the samples taken from the first supermarket had the lowest level of microbial contamination. This experimental finding demonstrated the need for sanitary improvement in the beef retails markets and strict sanitary guideline and implementation of these practices could guarantee consumers＇ health by consuming raw beefs with the lowest risk of foodborne pathogens.
文摘试验旨在研究以棕榈粕为主要原料,以酿酒酵母菌和消化酶为发酵剂的发酵原料对肉牛生长性能、表观消化率及经济效益的影响。试验选用条件相近的育肥牛18头,随机等分成2组,对照组饲喂基础饲粮,试验组用棕榈粕发酵原料替代50%基础精料补充料,试验期共95 d。结果显示:①与对照组相比,试验组平均日增重(ADG)提高11.51%(P<0.01),平均料重比(F/G)降低9.48%(P<0.01);②试验组酸性洗涤纤维(ADF)、淀粉的表观消化率显著高于对照组(P<0.05);中性洗涤纤维(NDF)的表观消化率极显著高于对照组(P<0.01);粪便分析筛测试结果表明,试验组筛上层残留物质比例极显著低于对照组(P<0.01),下层残留物质比例显著低于对照组(P<0.05),中间层残留物质比例极显著高于对照组(P<0.01);③试验组与对照组相比,每千克增重的饲料成本降低13.66%(15.74元/kg vs 13.59元/kg),毛利润提高29.44%。研究结果表明,棕榈粕发酵原料对肉牛生长性能、消化代谢、经济效益等方面有较好的改善和提升作用。
