Abstract

Considerable attention has been given to linear measurements in cattle, because they are objective and highly heritable. Linear measurements together with per= formance testing will in future play an important role in selection of the most suitable bulls for breeding. The information gained from the frame size accord= ing to linear measurements must be related to the size of the cows to which the bull will be bred. This is essential in order that the progeny will be able to meet the requirements of commercial breeders. Obviously no single frame size will be best for all the breeding systems and environments, but because the larger frame size cattle will grow faster and reach physiological maturity later, they will be more readily acceptable to the present South African market. Whilst body length exersices greater influence on growth performance in Simmen= taler- and Santa Gertrudis bulls, the shoulder height had a greater influence on growth rate in Hereford bulls. In the British Beef Breeds eg. Hereford, the frame size will be a more reliable parameter of growth potential than in the large frame dual purpose breeds eg. Simmentaler.
 

F. JC Swanepoel, H. Heyns, J. M van Zyl

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., , 446–450, 1986
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