بررسی آلودگی باکتریایی عفونت یکسه ی زرده در جوجه های گوشتی شهرستان شهرکرد

Yolk sac infection is a major cause of mortality of broiler chickens during the first week post-hatching.it may cause 100% mortality but the mortality rate is usually between 5% and 10%. in this research500 samples (from 50 farms) were randomly taken from culled chicks during the 6 month period. the resultsshowed that 93/88% from isolated bacteria were e.coli, 34.69% were staphylococcus, 16.33% weresalmonella, 10.20% were entrobacter, 6.12% were clostridium and 4.08% were proteus. escherichiacoli was the most common bacterium recovered from samples. fecal contamination of eggs is consideredto be the most important source of infection. so, fumigating or disinfecting of eggs within 2 hours afterthey are laid could reduce contamination rate.keywords: yolk sac infection, broiler chickens, shahrekord