© 1970 by Mrs Joan Beard
As printed in the A.S.C. Asian Breeds Bulletin (NSW, Australia) May 1970 pages 4 & 5.
Apso breeders will be welcome news received by Mrs. Joan Beard in connection with the
“Prapso” problem (untypical smooth-coated and smooth muzzled specimens that occasionally occur in otherwise normal litters).
Information about the pedigrees of “Prapsos” was supplied by Apso breeders in Australia and the U.K. and submitted by Mrs. Beard to CHART, an organisation which specializes in the charting of pedigrees for a subsequent study by geneticists.
It now appears to be generally agreed that the inheritance pattern of “Prapsos” is not a simple dominant/recessive relationship as was first suspected, but involves what is called QUANTITATIVE CHARACTERISTICS.
Quantitative inheritance involves characterists which depend on the interaction of a very large number of genes, all able to effect each other in varying degrees. This type of inheritance is extremely complex. However, despite its complexity, it is within the powers of the average dog breeder who has not a deep knowledge of genetics to deal with the situation by strict adherence to the classic rules of good dog breeding methods.
One encouraging aspect is that good specimens of the breed, that have produced “Prapsos” do not need to be completely written out of a breeding programme, as would be the case if the cause were straightforward dominant/recessive relationship, but may be used to a limited degree.
The following is a suggested policy for breeders to follow: