SUMMARY
Age structures of dairy cattle populations were determined from 4 years of
data from the Victorian Herd Improvement Program. The effects of herd size,
major genotype being kept and region on age structure were significant.
Historical fluctuations in the economic fortunes of the dairy industry have also
affected age structure, Modelling the consequences of altering age structure
suggests that varying age structures from those existing in Victoria will make
little difference to possible genetic gain and productivity.
اسعد | asaad | 1143