HIGHLIGHTS
SUMMARY
Strain 13/N guinea pigs, which also appear in the literature as strain 13 or 13N, were originally developed in the early 1900s by the United_States Department of Agriculture (USDA). Despite their notable utility, currently in the United_States, there is only a modest number of strain 13/N guinea pig colonies in institutions, limiting the supply of these essential animals. One of the challenges in maintaining colonies of strain 13/N guinea pigs is their breeding, since 13/N guinea pigs have smaller litter sizes and slower growth rates when compared to outbred Hartley . . .
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