Inheritance in dogs : with special reference to hunting breeds / by Öjvind Winge ... translated from the Danish by Catherine Roberts.
- Øjvind Winge
- Date:
- 1950
Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Credit: Inheritance in dogs : with special reference to hunting breeds / by Öjvind Winge ... translated from the Danish by Catherine Roberts. Source: Wellcome Collection.
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![Inheritance in Dogs generation and masks short-hairedness. Wirehair has, there¬ fore, the possibility of segregating out short hair, but short hair cannot segregate out wire hair. In the second generation a simple segregation occurs in the numerical ratio of 3 Wirehair: 1 Shorthair. The fact that there is only a difference of one factor excludes the possibility of new combination products, as previously stated. It is quite otherwise when breeds differing greatly in appearance are crossed. Here there is so much segrega¬ tion in the second generation that one is generally unable to determine the number of factors by which they differ. There is a breeding method that can be used relatively easily by the small breeders, and it certainly should be employed to a greater extent than heretofore, since it has often given satis¬ factory results. It is the so-called grading method. We have two breeds, A and B, of which one. A, possesses a character that we wish to establish in B, without this second breed's losing its own characters. First, an animal from breed A is mated with one from breed B, and then one of the hybrids, A X B, is crossed with the breed B, into which we desire to introduce the charac¬ ter. Perhaps already in this first backcross generation, ÇA X 5) X В, we will find individuals that satisfy our demands, but, if not, we must mate this backcross generation, or the most prom¬ ising individuals of it, with that breed which we wish to im¬ prove, B, so that [(Л X B^ X B] X В individuals are produced. By this method one often succeeds in establishing a single new character in a breed. It is especially successful when a so-called dominant gene is involved. Let us suppose that one has a breed such as the Old Danish Bird Dog, which was heavily built and therefore slower in ranging the field than desired. One wishes more speed in the breed. One therefore crosses this bird dog with a more lively hunting dog as, for example, the Pointer (as it actually hap¬ pened) or the English Setter. A pair of hybrids of the first gen¬ eration are backcrossed to the Old Danish Bird Dog, and it will then be found that, among the offspring, slender animals with 12](https://iiif.wellcomecollection.org/image/b18023162_0027.JP2/full/800%2C/0/default.jpg)
