Hi, I am thinking of doing a half brother half sister mating ( same father different mother) has any body done this mating and if so did you have good ? or bad results? . Thanx .

As with any mating, it depends on the quality of the parents. It will firmly fix any traits, both good and bad, so be sure you know the background of all relatives inside out.

Including all health traits too although I'm sure Jeangenie covered this by 'any' traits
and knowing the background of all the relatives.

I know some have tried it and it has been sucessful but these have been very knowledgeable
and experienced people who know their bloodlines etc inside out.

It's been done plenty of times in the past but unless you know the lines and what is contained within the genes it is not a good move. There is a very strong risk that there would be recessive gene problems and on a mating as close as this, a very strong risk that they will come out. I personally would not do it and further more I would think twice about buying a puppy bred that close. I would need to know that the breeder knew their lines inside out before even considering one.

Regards, John

Thanks very much for all your prompt replys, i think taking into consideration all the posts advice  its maybe not a good idea. i was undecided my self, ( hence the posting asking for advice) so thank you all and will leave that mating alone. !;-) ;-) As always on this forum very helpful , sound advice. big thanks.

Give yourself a shiny.

dont you mean a brownie point lol
fiona

It is called Inbreeding, Breeding sibling to parent, half brother to half sister, or with the closest inbreeding of all brother to sister, means stability and purity of genetic material is obtained. Inbreeding concentrates both good features and faults. It does not produce degeneration, it simply concentrates weaknesses already present so that they can be recognized and eliminated.
The most important facet of inbreeding is to choose as nearly faultless partners as possible and to select rigidly from the resulting babies. If the animals used are generally good, with only a few minor faults then inbreeding will concentrate the virtues in those animals while at the same time bringing to light faults within the line. Faults are not corrected by inbreeding they are simply made recognizable so that they can be eliminated. The result of inbreeding with rigid selection is the complete stability of the line and animals that breed with an unusual similarity of type.

With some lines inbreeding can reveal weaknesses that were never expected such as decreased vitality, physical or mental abnormalities and lethal or crippling factors. It is not possible to tell if this will happen before starting an inbreeding programme even with seemingly healthy breeding partners as a foundation. The best chance of success comes from using animals that have been strongly in-bred and have not been appreciably weakened by it in any way.

One of the interesting factors of inbreeding is the extremes produced. The average quality of the animals in an inbred litter is the same as the average in line breeding or outcross breeding, but the extremes are greater. Inbreeding is capable of producing both the best and the worst and these degrees can be found present in the same litter.

Some of these extremes may be too awful for the breeder and resulting animals to withstand including physical, mental and lethal abnormalities. Novice breeders may be better to line breed which is less extreme and can therefore be considered by some to be a more desirable method for breeders to create a "strain" that produces animals of a similar type.

what book did you copy that from!!!

Most useful reading:

The Downside of Inbreeding:
It's Time For a New Approach
http://www.canine-genetics.com/Price.htm

Wherever it's from, it makes excellent sense.
:)

i know, i was only jesting!!

Usually when you are breeding, you are looking for the best qualities of the do, depending on what you want to accomplish in the particular breeding. For example; I enjoy breding Siberian Huskies and Alaskan Malamutes, in order to obtain the best quality show prospects of each particular breed.

That entails going through each animal's individual pedigree, and study each individual animal in order to bring out the good traits and eliminate the bad ones. A refinement if you will, of each breed's standard. When you inbreed, you are only bringing out the bad qualities and traits of that particular breed.

Contrastingly different, line breeding is a broad kind of inbreeding that conserves valuable characteristics by concentration. It creates "strains" within the breed which are easily recognized by their similar conformation or type and because it is not extreme, it is relatively safe.
Specifically line breeding entails the selection of breeding partners who have one or more common ancestors in their pedigrees. These individuals (or individual) occur repeatedly within the first four or five generations, so that it can be assumed that their genetic influence moulds the conformation or type of succeeding generations.

Line breeding can vary in intensity with animals being strongly line bred or only remotely so. Selection is as important a factor for line breeding as it is for inbreeding. If breeders line breed to produce the specific type of a certain outstanding individual, they must select in succeeding generations, breeding animals that are the prototype of that individual.

Hope this helps you and all readers. Sorry, I don't have more time to post, but duty calls.

D.Harobed

Credentials:
Licensed Veterinarian 12 yrs.
Genetics 5 yrs.

D Harobed... wonderful post!! I would love to know more about inbreeding. When is line breeding considered close enough to be termed inbreeding? I am mating my bitch to one of her grandfathers... is this considered inbreeding?
   Madison

The difference is only in the degree.  Most people would consider mating to a Grandparent as being close inbreeding.  the closest is brother to sister, then parent to offspring.  Without calculating I think half brother to half sister is similar to Grandpoarent to grandchild with Grandparent mating being closer.

With half sibs you will have the shared parent as half 50% of the pups blood, so same as if he were the pups sire.  With grandparent to grandchild the grandparent will be 62.5% of the pups blood so you are going to be breeding closer sitll than half brother to half sister.

I have on two occasions mated a bitch to her Dams half brother.  that gives me pups with Grandfather and Great granfather the same dog.  So he then is 25% + 12.5% = 37.5% of their pedigree.

If you look at it this way you can see why line breeding is used to keep the ancestor having influence on the resu7lting pups as it halves with each generation.

Parent if 50%, Grandparent is 25% and so on.  so when the smae animal appears more than onece it brings their influence to the fore.  Though this is an oversimplification.