What is consanguinity and line breeding: and its importance?

We start this article first by defining the word consanguinity.

Inbreeding the production of offspring by parents more closely related than the population average. Genetically, inbreeding increases the portion of homozygous genes in the inbred population.

Line breeding is a form of inbreeding in which an attempt is made to concentrate an ancestor’s inheritance, or an ancestor’s line in a herd.

It gives me great pleasure to share a topic with those interested in defining this issue of dog breeding. As a geneticist and master breeder, I present this article because so many people in the dog business are breeding dogs and you always hear the comment, “Oh, he’s inbred to his family.” Well, I am sharing this article with you so that before you comment, you at least know what the words mean and how they can be used in a positive way to help the breed we love so much, the Jack Russell Breed!

Inbreeding is a mating system in which offspring are produced by more closely related parents than the average for the population from which they came. Example A: The mating of a father with his daughter

Example B: The mating of a full brother with a full sister.

These procedures are avoided because past experience has shown that inbreeding is generally associated with the development of genetic defects and a general decline in vigor and yield.

In humans, it is believed that the children of first cousin marriages are doomed to suffer physical or mental deformities, and this belief is the reason why we have laws that prohibit the marriage of close relatives.

The genetic effect of inbreeding is that it makes more pairs of genes in the population homozygous, regardless of the type of genetic action involved. All phenotypic effects of inbreeding result from this single genetic effect.

Inbred animals are typically less able to cope with their environment than non-inbred animals. This is demonstrated by their ability to reproduce and litter size decreases along with a slower growth rate and small body size at maturity. You will also see a weakening in the immune system which will cause more illness and disease within these inbred individuals. Some of the other negatives that we Jack Russell breeders really need to watch for are the jaw line, how the teeth line up in our puppies and by which families and individual we use we can identify progeny with any other early defects.

Now we turn to the topic of online parenting and its benefits. Line breeding is a form of inbreeding in which an attempt is made to concentrate the inheritance of one ancestor, or line of ancestors, and is usually a male rather than a female because a male generally produces many more offspring than a female. Line breeding is usually a mild form of inbreeding that is directed towards one ancestor often involving the mating of half-siblings. It can also be used as close as a grandfather – granddaughter pairing or an uncle – niece pairing. Again, you will increase the genetic traits of the bull you want to use. I believe this method will be beneficial in helping to understand the definition and its use in any breeding program. But again, we should always strive to produce a structurally correct and genetically sound short-legged Jack Russell Terrier that we can all be proud of.

For example, some of the characteristics to avoid when mating our short-legged Jack Russell Terrier are excessive back length and poor quality legs that are not straight and healthy. We would always prefer a dog whose ear fits snugly against his head and bends down, not up. Once again, we need to look at the jaw line for upper and lower bites. We must also take into account the depth of their body capacity and the opening of their ribcage, after all this is where the pups will be taken. Again, you want a dog that has a wide base width when viewed from behind. This also affects the birthing process. And again, you want a prominent vulva in your bitches because the more correct we make our bitches, the longer their reproductive lives will be and their overall health will improve. This will again ensure you and your client a pup you will both be proud of!