532 



APPENDIX 



Pedigree Charts. — Pedigree charts are essential to insure that inbred strains of animals 

 are being propagated through a single pair and not through series of animals that were 



Fig. 77. Portion of a pedigree chart showing the source of one inbred strain. 



FHJ 

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The descent of the main line through a single pair is indicated. Other siblings and 

 cousins may be bred to produce more animals at any one time, but the pedigree history is 

 continuous through single pairs in each generation. 



