Transfer of immunoglobulin from mother to baby through placenta or colostrum is called passive transfer (PT). The ruminant placenta is a syndesmochorial type and is a barrier against the transfer of maternal immunoglobulins from the blood to the infant. Therefore, in ruminants, the inability to transmit colostrum immunoglobulins is called Failure of Passive Transfer (FPT). This study aimed to determine the percentage of FPT in lambs and kids in Garmsar County and the effect of factors such as race, gender, mother's age, mother's parturition and type of livestock (lamb or kid) on FPT. This study was performed on 101 healthy 2-4 day-old lamb and kid in 10 herds of sheep and goats in Garmsar County. After examination, confirmation of clinical health, sex, age, race, birthday time, number of mothers, parturition, maternal age and newborn weight, 3 ml of sterile blood was obtained from the jugular vein. These samples were immediately referred to the lab in without anticoagulant tube and adjacent to the ice. The biuret method and Zn-sulfate turbidity test were determined on the level of total protein and immunoglobulin G serum. The results of this study revealed 50/50% occurrence of FPT in the lambs and kids understudy, the relationship between race and sex with the incidence of FPT, and the lack of relation between maternal age, mother's parturition and type of livestock with the incidence of FPT.