Line-Breeding/In-Breeding - The Horse Forum
 
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post #1 of 8 Old 05-26-2011, 11:37 AM Thread Starter
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Line-Breeding/In-Breeding

I do understand and accept this to be of controversial subject matter. I have broad shoulders and a strong constitition to bare any negative responses.

I have seen here and locally pedigrees of several horses who go back into the very same gene pool extremely close-up in parentage both on the topsides and bothsides.

I feel the necessity to info those who are just getting into the "Wonderful World of Horses" the difference between line-breeding and in-breeding. They actually are one and the same. It's "line-breeding" if it produces a very good cross of close-up parentage. It is "in-breeding" if the close-up parentage is not a niche(nick).
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post #2 of 8 Old 05-26-2011, 11:43 AM
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I understand in-breeding to be brother and sister type of breeding rather than what you describe above.

An example of line-breeding would be the same grandparent on each side such as Impressive being the grandfather of the dam and the father of the sire type of deal.

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post #3 of 8 Old 05-26-2011, 12:13 PM
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Farmpony is right - line breeding is NOT the same as inbreeding. Inbreeding is breeding direct, close relations, usually siblings, or parent to foal. Line breeding is breeding horses of a particular family. Crosses usually are only ever as close as grandparent to grandchild, or cousin to cousin.

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post #4 of 8 Old 05-26-2011, 12:33 PM
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I agree they are not the same. There is a big difference. Also even some breeding which would fall into the category of in breeding produce some very very nice horses. Leo is a good example of this.

You can not use the same standards with humans and horses. They are very very different. Line breeding is used to set a geno type. It can be done in many ways as long as the person doing it is well versed in the lines and horses being used. Some lines line breed better then others. There are some that I would be very very hesitant to line breed even with in 4 generations and others I would have little problem with in 2 generations.

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post #5 of 8 Old 05-26-2011, 02:14 PM
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To get a good sense of line breeding you should look at many of the European warmbloods.

I am more versed in Hanoverian and it is done extensively and they are some of the most sought after ( for high level competition) horses out there.

They have perfected this method to a "T".
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post #6 of 8 Old 05-26-2011, 04:38 PM
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Most Shetland pony breeders up here say that line breeding and inbreeding is the same but line breeding is breeding for a particular purpose and producing a brilliant result whereas in breeding is the same but the produce isn't desirable. Personally I wouldn't do either as you are greatly increasing the chances of the foal inheriting a hereditary disease. But that is just my opinion.

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post #7 of 8 Old 05-26-2011, 05:07 PM
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Quote:
Originally Posted by rbarlo32 View Post
Most Shetland pony breeders up here say that line breeding and inbreeding is the same but line breeding is breeding for a particular purpose and producing a brilliant result whereas in breeding is the same but the produce isn't desirable.
This is the old cowboy definition of line breeding. It is line breeding if it works and inbreeding if it doesn't.

Personally I wouldn't do either as you are greatly increasing the chances of the foal inheriting a hereditary disease. But that is just my opinion.

Actually line breeding/inbreeding does not cause hereditary disorders but amplified them or shows them as most are recessive and it takes to for the disorder to show. Genetic disorders are simply mutations and do not show until you get 2 matched genes (homozygous).

The reason people line breed again is to set a geno type over a pheno type. This way you will get the desired trats the next generation.

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post #8 of 8 Old 05-26-2011, 05:25 PM
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To me, inbreeding is when you pair father-daughter, brother-sister, mother-son....not when you go back two generations.

Line breeding is done quite frequently in the Standardbred business, and normally is a 3rd line plus and back thing (Grandparents and back).

When done properly, you will get a much desired horse, and get good qualities in the horse. Like some other breeds, there will always be a line that you don't want, but then other lines that are excellent. The ones that are excellent tend to have more line breeding done.

This mare, Irish Luck, has "Most Happy Fella" on each side as a grandparent.

Stonebridge Regal also has some line breeding done, but Albatross and Meadow Skipper show up in different locations on each side...which I think is interesting. Interestingly enough, Regal won over a million, yup, million during his career. Pretty sure line breeding worked out on this one.
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File Type: jpg Irish Luck Pedigree.jpg (21.1 KB, 256 views)
File Type: jpg Stonebridge Regal Pedigree.jpg (64.1 KB, 286 views)

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