Contributions of laboratory animals to livestock breeding research have been reviewed by Chapman(1961), Roberts(1965), Falconer(1966), and Bell(1974) and thus no supplementary comment would be needed of their values. At present, a considerable number of scientific papers on animal breeding research dealing with laboratory animals has been published every year. 

Nevertheless, there seem to have some confusions among scientists with respect to> the interpretation of genetic modelling. There are two distinct attitudes of mind. The first one refers very broad category
in which any genetical experimentation dealing with inheritance in laboratory animals,i.e., Mendelian inheritance, sex-linkage, physiological, biochemical and molecular basis of genetics, polygenic variation, polymorghisms, induced mutations, chromosomal rearrangement, etc., are included. Those researches are very broad in nature and sometimes not immediately applicable to animal breeding, even though those may be very important in the long run. On the contrary, the second one refers rather restricted category in which experimental check of quantitative and population genetic theories including parameter estimations, effectiveness of selection, efficiencies of different breeding methods, test of new selection methods under different conditions, etc., are main subjects for research. In other words, the second attitude confines the genetic model to quantitative genetics in laboratory animals in which the conclusions from the experiments can be applied to animal breeding either directly or indirectly. The experiment is undertaken as a pilot  experiment to solve a particular problem in animal breeding.

Y. Yamada

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 15-17, 1982
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