Soheila Chalesh gari - General Veterinary Student, Shabestar Branch, Islamic Azad University, Iran
bahram hosseinzadeh - General Veterinary Student, Shabestar Branch, Islamic Azad University, Iran
mehrasa vanhari - General Veterinary Student, Shabestar Branch, Islamic Azad University, Iran
Kosar khazar - General Veterinary Student, Shabestar Branch, Islamic Azad University, Iran

probiotic is referred to as the complement of living microorganisms which is added to the food to improve the weight gaining and FCR and decrease the mortality rate. the lactobacillus bacteria population in the crop and gizzard of the broiler chickens in a single period of culture are evaluated in 3 different. Samples are gathered from crops andgizzards of broiler chickens at the different ages and different groups and they are dilutes to 10-2 to 10-6 concentrations at the. Lactobacillus population in the groups which receive 'probiotic A' were higher than the control group.

Probiotic A, Lactobacillus, broiler chicken