Quarter Milkers are used to separately milk out an infected or injured quarter of the udder without interfering with the regular milking process. It effectively isolates one quarter of the cow's milk from the non-infected ones.  Useful in cases of high somatic cell count (SCC), injury, mastitis, or hemorrhage. A Quarter Milker is the dairyman's assurance that affected milk is kept out of the milking system. When used properly, bulk tank bacteria and somatic cell count may be reduced by preventing affected milk from mixing with good.