Abstract: The aim of this study is to introduce the nomadic sheep breeding system, its importance in the econonical life and its effects on the crossover of the sheep genotype in the city by means of the observations and surveys carried out on the registered nomadic sheep breeders of isparta city breeding sheep-goat breeder’s association. They live in tents woven of goat hair. In this life style, two or three families who are close relatives with one another and who have 250-400 head sheep migrate altogether. The animals shelter temporarily in places called as bed which are surrounded with simple fences. Nomads from Isparta have tried to convert their sheep into a form with no tail bringing Sakiz and Kivircik croosbred or Kivircik rams from the cities of Aydin and Izmir. It has been observed that in their flocks which have different crossbred types and are not in a single structure, they prefer a sheep genotype which can give twin births which has high milk productivity which is completely white and which is close to Kivircik genotype. The folk of the region has named this genotype as Pirit. While the annual income obtained in nomadic flocks is 45075 TL (20684.85 EUR) total expenditure is 6150 TL (2822.54 EUR) thus, the net income is 38925 TL (17862.31 EUR). In an average family of four members monthly income per member is 810.9375 TL (371.75 EUR). The number of enterprises dealing with nomadic sheep breeding has been decreasing due to the prohibition of forest areas and the high levels of fiscal punishment applied. We claim that with regards to the development of the nomadic sheep breeding of the city of Isparta and the sustainabilty of it and for the purpose of generating the desired sheep type in the city, its spread and stud flow, an improvement model must be developed and applied on the nomadic sheep flocks which will speed up the change process of the sheep breeding in the region. For this reason, some legal arrangements must be made to determine the boundaries of the available pasture areas and for their utilization. A cooperative or a company should also be established for a better marketing and evaluation of the products in present production conditions.