| Popis: |
The condition of muscular hypertrophy has been assumed to be inherited as an autosomal partial recessive in British breeds of cattle. A simulation model with overlapping generations was developed to examine the effects of selection, migration, population size, calving rate, culling methods and culling rate on (i) the change in frequency of the m gene and (ii) the distribution of gene frequencies in a population of commercial females subdivided into herds. Heterozygote (m+) animals had a selective advantage whilst homozygote (mm) double muscled animals were completely selected against. Migration of males was considered to be undirectional from a male purebred population where the parametric gene frequency was set at 0.1, 0.2 or 0.3. |
