Study of Inbreeding in the Inbred Population of Holstein Cow in Iran

Background and aim: the aim of this study deals with the amount of inbreeding in the population of iranian holstein cow and its changes over the last 33 years.methods: the information on pedigree for 1077401 animals collected by the centre of breeding and improvement of livestock production since 1983 to 2016 were used. after reviewing by excel software and estimating inbreeding by algorithm miocene and leo, we check it out with sas9.1.results: inbreeding of inbred individuals in this study were analyzed. the results showed that the number of inbred animals in the pedigree of the population is 74899 heads. the mean coefficient of inbreeding in the iranian holstein cow population was 1.07 percent. the minimum inbreeding was zero and the maximum 50 percent. the inbreeding rate was significant in the population (p<0.01).conclusion: this showed an increasing rate of inbreeding in the population. inbreeding increases cause elevated homozygosity. this also led to reduced genetic variation within and increased it among families or lines it has a negative effect on growth, production, health, reproduction, and survival. because of the increase in inbreeding and its harmful effects on production, the producers should be clearing away.