Jane with four Generations
This section contains explanations of some of the breeding terms - family lines, in-breeding, out-crossing and line-breeding which are often used (and misused) when discussing selective breeding of pedigreed animals. But it is important to remember the names on the pedigree can only say so much. An excellent example of these terms can be seen by following this link to the Rangeaire Index.
In selective breeding, the successful breeder creates a dog typical of the Breed Standard. Producing a selectively bred litter is like painting a beautiful picture, or composing an excellent piece of music. Then selecting that special puppy requires what the experienced old-timer used to call, 'an eye for a dog'. There are many examples of breeds being selectively bred to create specific characteristics. In most cases, it took more than a century to make the transition from these types of dogs selectively bred to perform particular specialized tasks, to the modern show dog. You have the responsibility of being the guardian of your breed for the time being.
French Bulldog and Great Dane
There is no substitute for a deep understanding of the strengths and weaknesses of the individual dogs whose names are contained within the pedigree. That means analysing how closely they adhere to the Breed Standard, as well as what applicable inherited diseases known in your breed. Remember selective breeding is a creative art. You are selecting dogs carrying desirable characteristics and genes and eliminating dogs that do not.
Selective breeding of typical dogs creates a well-bred pure breed dog which should not only be pleasing to look at, it should also have predictable physical and mental characteristics. When carefully chosen, such a dog will complete a household, a family, a life. Like a beautiful picture hanging on a wall, that selectively bred pure breed puppy has the best chance of bringing special pleasure into the lives of those who bought it because of its good looks and temperament.
What is a Family Line?
If you think of a pedigree as a tree, then one bough represents one family line of three or more animals directly the progeny of each other. With pedigreed dogs, all the dogs on this bough must have been recorded by a recognized registration body. So a male line continues from grandfather, to father and then to the son, and a female line continues from a grandmother to a mother and then to the daughter.
Saint Bernard pup
In breeding is the mating of very close relations i.e. mother-son, father-daughter and brother-sister. These types of matings are sometimes a tremendous success but more often an unqualified failure, as they bring out and emphasize the good and bad in the stock. It should never be tried unless the animals are really excellent specimens of the breed as well as having generations of animals that have been screened to be genetically free of inherited diseases.
Out crossing is the mating of completely unrelated animals. This results in extremely varied animals and is of little help when trying to establish a kennel type, except if you wish to introduce a certain characteristic contained strongly in the line into which you are out crossing, and which is lacking in your own line. Again screening for inherited diseases is most important in both parents and grand parents.
Line Breeding Example
Line breeding is the middle course or the mating of somewhat related animals with the characteristics of the common ancestor being the ones you wish to emphasize. Line breeding is commonly used when breeding pure breed animals. This method is successful when attempting to establish a line containing particular breed characteristics or animals of a certain breed type.
Line breeding involves breeding somewhat related dogs that display certain specific characteristics, for example hairlessness. So when this common ancestor then appears on both sides of the pedigree this increases the probability of the desired characteristic appearing in the litter. When many generations of dogs are line bred, the inter-relationships can be quite complex. An excellent example is the Rangeaire Map (illustrated left).
Note that line breeding involves breeding for characteristics. It is not necessarily true that the best show dogs will be able to produce puppies that will be the best show dogs. This is because:
- A dog can throw a characteristic which it does not necessarily display.
- A dog can posses certain characteristic but may not necessarily throw it.
For this reason, when choosing a sire and dam, it is really important that each weakness in the sire is covered by the dam, and likewise each weakness in the dam is covered by the sire. Thus, by knowing your breed standard well, you can choose a dog which throws the characteristic(s) your bitch lacks as well as recognize your bitches' correct characteristics your possible choice of dog lacks. Then choose a puppy that has the best characteristics of both.
References and Further Reading
The above, complete with moving computer graphics are explained further in the DVD 'How to Make a Showdog' by Jane Harvey