Heterozygosity is of major interest to students of genetic variation in natural populations. It is often one of the first "parameters" that one presents in a data set. It can tell us a great deal about the structure and even history of a population.
Heterozygosity can be measured in terms of positive hybrid vigour due to gene action from dominance, overdominance and epistasis. The gene action involved or responsible for an expression of heterosis in the trait under question can be roughly gauged in pedigreed populations in terms of higher magnitude of heritable variation from the dam component. If the population studied has a history of inter-population x-bred breeding and ultimately maintained as a closed flock undergoing intra-population selection, there is a chance for higher variation from dominance deviations besides epistatic variations contributing to heterozygosity. You may refer to standard books on population genetics and breeding for more understanding.