Aa. Kars et al., FACTORS INFLUENCING GROWTH TRAITS IN THE NGUNI CATTLE STUD AT BARTLOWCOMBINE, South African journal of animal science, 24(1), 1994, pp. 18-21
Data collected from Nguni calves born at the Bartlow Combine Breeding
Station were used to investigate factors affecting live weights at bir
th (1960-1991), 205 days (1960-1991), 365 days (1974-1990) and 540 day
s (1975-1990) of age. Sire, year of birth, sex of calf and age of dam
were found to be highly significant (P < 0.001) sources of variation.
The effects of interaction between year of birth and sex of calf and t
he inbreeding of the calf and dam were significant for some traits but
their relative effects were small. A suitable model to describe the d
ata for the respective traits which can be used to calculate genetic p
arameters and breeding values is constructed and discussed.