Field data collected for Ontario beef herds from 1984 to 1988 were used to study the effects of breeding system, sire and dam type on herd productivity. Mean herd productivity ranged from 501 kg cow-1 in 1984 to 538 kg cow-1 in 1987. Among herds retaining replacement females, breeding systems involving purebred sires, dams and calves had higher (P < .05) herd productivity compared to systems involving crossbreeding. Crossbreeding systems involving crossbred sires tended to have the highest productivity among herds purchasing female replacements. Increasing the percentage of sire types with larger frame size was associated with higher herd productivity. Increasing the percentage of larger frame size and/or higher milk potential dam types resulted in increased herd productivity

R. A Kemp, C. F Fiss, P. G Sullivan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 365–368, 1990
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