This factor of superior progeny has been noticed in other types of live- stock. In Herefords it is a recognized fact that when Anxiety IV was mated to daughters of North Pole, the resulting progeny were much superior to those of other matings. In Standard Bred horses the crossing of the descendants of Peter the Great with those of Axwortlly has given such superior, uniform progeny that it is known as the Golden Cross. Hervey and Heizer (1) have shown in comparing daughter-dam groups of the various matings of three Guernsey sires that certain crosses resulted in significant differences in production. They attribute these differences to nicking. Fohrman and Graves (2) made a study of the daughters o£ 51 Ayrshire sires. In one case they found that the daughters of Sire 36 out of dams by Sire 11 averaged higher in production than did those daughters of Sire 36 out of dams by miscellaneous sires. In direct contrast to this an editorial in Hoard's Dairyman (3), in discussing nicking, states that the Pennsylvania State College has records of 100 proved bulls in which it finds that those proved to be prepotent in one herd were prepotent- in other herds and vice versa. These conflicting opinions raise the ques- tion: "Will a bull proved to transmit high producing capacity in one herd be equally successful in another herd where a different family blood line exists ?" SOURCE OF DATA AND TREATMENT