Is line breeding Good Or Bad?

[LiLLooney "Leo Geckos"]

???:main_huh:

 

[Halley]

good.

Inbreeding can be bad if done for too long, but i wouldn't worry about it to much.

 

[snowgyre]

If it wasn't for line breeding, you wouldn't have any of the animal 'breeds' you see out there, including cattle, horses, sheep, goats, dogs, cats, virtually any domesticated animal. The thing you have to watch out for is inbreeding depression, which is when you stay within a line for 4 or more generations. You need to outcross periodically to keep your genetics strong.

There are very complicated matrix models to keep track of genetics. 'Course, it's been 5 years since I took beef cattle genetic planning, so I'm pretty rusty on the subject. ^_^;;

 

[Golden Gate Geckos]

There is a difference between 'line-breeding' and 'in-breeding'. Line breeding is how we develop the characteristics in geckos morphs by crossing 2 geckos that have the desired trait we are trying to bring out or improve. Inbreeding the breeding siblings together and/or breeding offspring back to parents. Too much inbreeding can weaken the genetic strength of any organism, however the lower the life-form the less probability of problems.

 

[snowgyre]

Aaaactually, line breeding and inbreeding are the same thing, we just use line breeding to make it politically acceptable. If you're taking two unrelated geckos that have the desired trait and breeding them, that's not creating a specific line, that's just creating a cross between those two bloodlines. Line breeding is when you stay within a bloodline, generally crossing offspring with desirable traits back to the parents, often daughters to father (especially in the case of livestock). It's not bad if properly managed, but there's a lot of hesitation to use 'inbreeding' to describe line breeding because of the social implications behind it.

Basically, if line breeding fails, we call it inbreeding.

Inbreeding
The mating of individuals who are more closely related than the average individuals in a population. Inbreeding increases homozygosity in the population but it does not change gene frequency.

Linebreeding
A mild form of inbreeding that maintains a high genetic relationship to an outstanding ancestor.

Because inbreeding is the mating of related animals, the resulting inbred offspring have an increased homozyosity of gene pairs compared to noninbred animals in the same population (breed or herd). There are 2 different kinds of inbreeding, one being linebreeding and the other being intensive breeding.

Linebreeding is used to make the genetics traits of an ancestor shine, usually being the sire. This mating system is best used by seedstock producers who have high levels of genetic superiority in their herds and find it difficult to locate sires that are superior to the ones they are raising in their herds.

Occasionally a breeder may produce a sire with a superior combination of genes that consistently produces high producing offspring. Some of these sires may not be outproduced by younger sires. This is observed in some dairy bulls that remain competitively superior as long as they produce semen. These sires warrant use in a linebreeding program.

An example of linebreeding...

Impressive, an outstanding QH stallion, is linebred to his ancestor, Three Bars, by three separate pathways. The inbreeding of Impressive is approx. 9%, whereas the genetic relationship of Impressive to Three Bars is approx. 44%. Inbreeding below 20% is considered low, whereas a genetic relationship is high when it approaches 50%.

Impressive has nearly the same genetic relationship as if Three Bars had been his sire (44% verses 50%). Progeny of Impressive have produced outstanding records, particularly as halter-point and working-point winners in the show ring. Unfortunately, Impressive has also been identified as a carrier of the gene that leads to HYPP, the result of a genetic mutation originated with Impressive.

Source: Scientific Farm Animal Production, copied from a member on THIShttp://forum.horsetopia.com/breeding-genetics/33139-linebreeding-vs-inbreeding.html forum

 

[herpencounter]

Look at the name, "line breeding"... LINE...


Lets define line.....



Line: When your familly tree does not fork. LOL

 

[Retribution Reptiles]

There is a difference between 'line-breeding' and 'in-breeding'. Line breeding is how we develop the characteristics in geckos morphs by crossing 2 geckos that have the desired trait we are trying to bring out or improve. Inbreeding the breeding siblings together and/or breeding offspring back to parents. Too much inbreeding can weaken the genetic strength of any organism, however the lower the life-form the less probability of problems.

So i can inbreed my plankton without any serious effects?

 

[acpart]

So i can inbreed my plankton without any serious effects?

Probably.

Aliza

 

[Golden Gate Geckos]

Aaaactually, line breeding and inbreeding are the same thing, we just use line breeding to make it politically acceptable.

Sorry, I disagree with the terminology. Line-breeding is different than in-breeding.

So i can inbreed my plankton without any serious effects?

LOL... let me know if your plankton come out with kinked tails or the "Stevie Wonder" head wave!

 

[Golden Gate Geckos]

Just to clarify... for example, my bold stripes are a line-bred morph. I crossed two unrelated animals that shared similar physical and/or genetic TRAITS (bold stripes) to create MY line of bold stripe geckos, which are now a distinctive line of their own. I crossed the R2 bolds with my own bolds to create a 'line-bred' bold stripe, and held back the best examples to breed back to one of the unrelated parents. Like your Google definition stated, it is "A mild form of inbreeding that maintains a high genetic relationship (not a direct genetic relationship) to an outstanding ancestor." Had I crossed siblings, or offspring back to their parents, that would have been in-breeding, as your definition states.