Abstract
1. In a 2×3×3 factorial experiment a total of seventy-two female or castrated pure Friesian, Charolais × Friesian and Welsh Black × Friesian cattle were fed individually and ad libitum on three diets from 200 lb to slaughter at 800 or 900 lb, depending on sex. The diets were ground barley (87%) and protein-mineral-vitamin supplement (13%) given with or without 1 lb of hay per animal daily, or ground maize (87%) and supplement (13%) given with 1 lb of hay daily.2. The three breed-types differed significantly in growth rate and feed conversion efficiency. Gaining at 2·66 lb/day and converting 4·56 lb of meal into 1 lb live-weight gain, the Charolais crosses grew 7·7 % faster than pure Friesians and consumed 14·1% less meal per unit gain. Welsh Black crosses made 9·3% less rapid gains and required 7·7 % more meal per unit gain than pure Friesians. The disparity between the three breedtypes increased with increasing liveweight.
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