Heterosis for gestation length, birth weight# suckling stimulus, weaning weight and preweaning growth was estimated from the first years data of a complete two-breed dlallel with the Devon and Hereford breeds. Involving 119 calves by 29 sires grown together under temperate grazing conditions at Gunnedah, New South Wales, Australia.
Estimates of heterosis (and average mid-parent values) for gestation length were 0.2% (282.9 days); birth weight 6.5% (32.6kg); suckling stimulus 22.9% (3.51/day); weaning weight 5.9% (155.1kg); and average dally gain to weaning 7.0% (0.6kg/day).

A. L Gyles, W. H Upton, K. Hammond, J. M Thompson, B. Tier

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 365–369, 1986
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