About Jeffrey Bragg

Jeffrey Bragg is Chair of The Working Canine Association of Canada , breeds Seppala Siberian Sleddogs and resides in Whitehorse, Yukon Territory.

Achieving Genetic Health for Our Dogs – Part 1

Purebred Dog Breeds into the Twenty-First Century WHAT IS A BREED? To put the question more precisely, what are the necessary conditions that enable us to say with conviction, “this group of animals constitutes a distinct breed?” In the cynological world, three separate approaches combine to constitute canine breeds. Dogs are distinguished first by ancestry, […]

Achieving Genetic Health for Our Dogs – Part 2

The Demise of Typological Thinking DNA RESEARCH has radically changed zoological concepts of species, subspecies and varieties. In the nineteenth century and the first half of this century it was thought that a species could be represented by a type specimen, that the vast majority of individuals of a species were virtual photocopies of the […]

Achieving Genetic Health for Our Dogs – Part 3

Lessons from Population Genetics Gene Frequencies Much of the work of population genetics involves estimating or calculating gene frequencies, which quantify the relative commonness or scarcity, within a particular population, of alleles at a particular gene locus. If there is only one version of a gene in the population, then the entire population is necessarily […]

Achieving Genetic Health for Our Dogs – Part 4

The Crux of the Problem AS WE FACE the millennium, the one problem which most concerns the entire purebred dog fancy is genetic defects. Breeders used to worry about overshot/undershot bite and cryptorchidism. Not much else of a genetic nature was cause for concern; fanciers were a lot more worried about distemper, hepatitis and internal […]