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A GENETIC ANALYSIS OF MATURING PATTERNS IN STRAIGHTBRED AND CROSSBRED HEREFORD, ANGUS AND SHORTHORN CATTLE.SMITH GM; FITZHUGH HA JR; CUNDIFF LV et al.1976; J. ANIMAL SCI.; U.S.A.; DA. 1976; VOL. 43; NO 2; PP. 389-395; BIBL. 17 REF.Article