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The Myth of Best to Best Explained


From: THE MYTH OF EXPLAINED!!! | Sporting Dog News

Hi folks, in following up as promised, and especially on my last sentence at the very end of my last posted article here a short explanation of the Myth of breeding best to best REGARDLESS. I post all this cause the quality of our beloved breed is hurtling towards disaster at present out of sheer ignorance,extremely mildly put, of the majority of present day breeders. Pedigrees, read : background knowledge, might not be important to this kind of Dumbos, sorry there, but luckily they’re a highly valuable tool for the last of the Mohicans struggling to save the Real American Pit bull terrier. Thanks! By L.C.Brackett and others.

Danger in Continued Out Crossing

When salubrious results are obtained in the first generation of an out cross, many breeders think-, the mating was an unqualified success and all they need do thereafter is to continue such out crossing to become great breeders with an established type of their own, producing a high average of good ones. They could not be more mistaken since the exact opposite is sure to occur. I can do no better than quote here from the world-famous geneticist Dr. E. Fitch Daglish, who is also a contributor to DOG WORLD. The following is an excerpt from his article (Invisible Factors Inherited) in the June l959 issue: “One of the fundamental principles of genetics is that it is not the visible properties of individuals that are inherited but those factors or genes which endow them with the ability to produce certain qualities under certain conditions. When two animals differing in genetic make-up are mated, their offspring must be genetically impure in varying degrees however closely the two parents may resemble each other in outward appearance. It is this, which causes the wide variation in size, shape, constitution and so on that is invariably seen is, the second generation of cross breeds. Impressive examples are furnished by the familiar utility crosses in poultry, cattle and pigs produced by farmers. Such first crosses are, as a rule, very uniform in appearance and for certain purposes are preferred as layers or fatteners, but if such hybrids are bred from the results are always disappointing. They are impure in respect to so many genes for all those factors in which their parents differed that their progeny show the widest variations and include a large proportion of individuals of very low quality from whatever point of view they are judged. “It may be objected that what happens when different breeds are crossed is not relevant to the effects to be expected from out crossing within a single breed but, genetically out crossing and crossbreeding differ only in degree. Both involve the mating of individuals whose genetic constitution is almost certain to differ widely so that there must be a drastic reshuffling of genes in the offspring.†It should be remembered, therefore, that as dog breeders we are dealing not only with the physical structure of a mating pair, but with the GENES inherited from the forbears shown in their PEDIGREES.

Failing of Many Breeders

The number of breeders who know practically nothing about the ancestors of their dogs is appalling. Many cannot even name when asked, without looking at a pedigree, the names of the sire and dam of a dog or dogs they own. Were they asked for a four-generation pedigree of one of their dogs, only a few could write it from memory. In my breeding days I could do this on any one of a hundred or more dogs in my kennel, with seldom an error. My contention is that, unless a breeder can do likewise and also has quite a complete knowledge of the virtues and faults of all the ancestors through at least the third generation and even further back is preferable he will not become even a good breeder, let alone a great one. He MUST KNOW from whence came certain traits, both desired and undesired, if he expects to retain or eliminate them. This cannot be accomplished by hit-or-miss breedings, be they inbred, line bred, or, most certainly, out cross.

This entry was posted in Breeding and tagged Breeding Genetic on 17 de January de 2015 by admin
Article source: THE MYTH OF EXPLAINED!!! | Sporting Dog News