Breeding Sibs

[ROMAX]

What's everyones thoughts on breeding a bull to his sister?
Has anyone tried it,did it work out?

 

[FriedgesCharolais]

People do it all the time. If it works out it is called linebreeding. If a defect shows up its called inbreeding. I would make sure that there are know known genetic defects or that they are carriers for any known genetic defects before I did it.

People do it because you get a lot more consistency in the type of calves produced because of the parents are closely related.

 

[RyanChandler]

The distinction between inbreeding and linebreeding lies in the inbreeding coefficient.  Those over 50% are considered inbred.

The greatest Angus bull of all time - EXT  is the product of a brother sister mating

Try it and see how you like it-- In general, your culling rate my be higher but your keepers should really express the characteristics you're looking to concentrate. 

 

[idalee]

One of the greatest Holstein sires of the early 20th century was the result of breeding a bull to his twin sister.    I am sure the breeder assumed that the heifer was barren as most free martins are, and had them together in the pasture.  But this one proved to be fertile and the result was history!

 

[ROMAX]

I kept a No Worries x Gigolo Joe for a bull this yr,i A.I.ed his mom,sister,grandam. The sister had her tail straight out and some discharge on her this morning.Just wondering if it was something I should try to get rid of or ride it out and see what happens?

 

[aj]

I bred a lot of half sib matings together.

 

[shortybreeder]

Any time you have an inbreeding coefficient over 6.25% you will get what is known as inbreeding depression, which is basically hybrid vigor in the opposite direction. So instead of above average production you'll get below average production/survivability. That said, inbreeding does not carry on to the following generation, so inbred breeding stock is just fine.

I'm going to disagree with Xbar's definition though and say the difference is that linebreeding is intentional whereas inbreeding is an accident. Anything over 6.25% is detrimental, 50% would just be more detrimental.

 

[RyanChandler]

You literally have no idea what you're talking about and as so should limit your comments to that which you at least have 'some' understanding of.

 

[HAB]

What's everyones thoughts on breeding a bull to his sister?


Has anyone tried it,did it work out?

Some of our best cattle are half sib matings.  Both sire on sire or dam on dam.

 

[shortybreeder]

You literally have no idea what you're talking about and as so should limit your comments to that which you at least have 'some' understanding of.

I know exactly what I am talking about because I just took a full semester course on the topic at my University this year.

 

[whitecow]

You should take the course over or go to a different university, because what you said above is garbage.

 

[shortybreeder]

You should take the course over or go to a different university, because what you said above is garbage.

What exactly was garbage? Inbreeding depression is well documented and impacts the same traits as hybrid vigor--low heritability traits such as survivability and reproduction. If an animal survives and is fertile, that's as far a hindrance as it will have on the breeding quality of an animal. And it doesn't matter how inbred an animal is, it's offspring will not carry that inbreeding depression forward unless both parents are related. And the number where this sets in is 6.25% as agreed upon by academics.

I concede that I used the term growth incorrectly. I have now corrected that part.

 

[RyanChandler]

If you're genuinely interested in learning, familiarize yourself with the works of Dr. Jay Lush, geneticist and professor Iowa State University

 

[r.n.reed]

I would consider it only if the animals are or very near to your ideal and their pedigrees are balanced with cattle that come close to your ideal as well.We have been breeding 1/2 sibs and closer with good success for a while now.

 

[Duncraggan]

One of my best rising two-year old bulls is a half sibling mating at 12.99% inbreeding. I will probably breed him to his mother at the end of the year after she calves, and he is currently running with his maternal half sibling. Good family that just seems to improve by the generation!

 

[Duncraggan]

I've just had a look and can confirm that I have a heifer in this family that is 19.33% inbred. She is good, not the best, only second, to her dam's dam's AI calf, I am approaching r.n.reed's and the Canadian's levels here!
I have gone completely outcross this year, used two Irish bulls I found on a trip there in 2007!
Just to put this into perspective, I have two registered herds, which I run separately, with different objectives. I do use walking bulls across the herds, mostly, but tend to err on the side of the smaller herd when it comes to natural service as I don't have the space to run them completely separately.