furstenberg's rosette furstenberg's rosette the furstenberg's rosette is located in the internal streak canal of the teat. it radiates upward into the teat cistern. it often is considered a barrier for pathogens, yet it offers little resistance to milk leaving the teat. furstenberg's rosette : is situated at the internal end of the streak canal. it has a protective leukocyte population which are thought to leave the teat wall and enter the cistern via furstenberg's rosette. it contains bactericidal cationic proteins (e.g. ubiquitin).