The need for genetic quality control has been recognised for several years, and has been clearly stated by Lane-Petter and Pearson (1972) as follows: ‘But, as with anything that has a name intended to be descriptive, it is necessary to be sure that the name is accurate; or that the product does in fact fit the name. With laboratory animals this requires constant or periodical testing, first to demonstrate that the animals are correctly described, and second to continue to demonstrate that, through mutation, miscegenation or any other cause, they have not ceased to be correctly designated. A programme of genetic monitoring is therefore necessary in any colony, inbred or outbred, in which genotype is of importance.’
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