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Offline randiliana

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Re: genetics of roan color
« Reply #15 on: June 22, 2010, 03:26:04 PM »
Forgot to mention, if he is using a white short bull he will get 50% white calves from those roan cows he already has.All the others will be roan from the red hereford marked cows.  If it is a roan bull 25% white calves. 50% roan calves. 25% hereford red marked. If it  is red bull it is the same as using a hereford bull as the roan (co-dominant roaning gene) is not there. What colour bull did he buy?

Regardless of what color bull he uses, he is most likely to get whitefaced calves. If he has been using/keeping straight hereford bloodlines, his cows should be homo for the hereford pattern and it is dominant so all calves should have a white face (even if they are white colored)

Offline randiliana

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Re: genetics of roan color
« Reply #16 on: June 22, 2010, 03:42:31 PM »
Quote

The bull he purchased is red with a very few white markings. He will probably get some brockle faces. He said his cows now all have solid white faces, so the Hereford has dominated in that coloring at least

Brockle face is another dominant gene. Most solid colored breeds carry the gene, including Angus and Shorthorn. Basically what this gene does it to put colored markings into wherever the animal would have white areas. It is common to see brockled faces and leg markings. Dominant genes are pretty easy to select for, or against. If you like the trait, you simply keep animals that show it and if you don't keep ones that don't show it. It isn't that the Hereford markings dominated, it is that the brockle genes were selected against.

Roan, Hereford and Brockling are all dominant (or co-dominant)genes at different loci, which means that they can all be carried and expressed at the same time. So it would not be surprising to see Roan, brockle faced calves.

Offline LostFarmer

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Re: genetics of roan color
« Reply #17 on: June 22, 2010, 03:47:25 PM »
Followup question.  In breeding color in quarter horses there is a lethal roan gene that will give either a missed pregnancy or a dead foal in a roan to roan mating.  In other words you can not have a homozygous roan horse.  At least that is my understanding of it.  Is the same true for the shorthorn genetics.  The shorthorn cross cattle I have been around tend to be freckled more so than roan.  Dad always liked the shorthorn x holsteins when he was a kid.  They tended to have freckles on the feet and face.  Kind of like a spaniel dog.  Interesting topic I am learning from all y'all. 

Offline justintime

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Re: genetics of roan color
« Reply #18 on: June 22, 2010, 05:14:55 PM »
Followup question.  In breeding color in quarter horses there is a lethal roan gene that will give either a missed pregnancy or a dead foal in a roan to roan mating.  In other words you can not have a homozygous roan horse.  At least that is my understanding of it.  Is the same true for the shorthorn genetics.  The shorthorn cross cattle I have been around tend to be freckled more so than roan.  Dad always liked the shorthorn x holsteins when he was a kid.  They tended to have freckles on the feet and face.  Kind of like a spaniel dog.  Interesting topic I am learning from all y'all. 

The roan deal in Quarter horses is a totally different deal. You can get a roan from a roan but you can also get a white or solid red from two roan parents. There is no issue with dead calves from the mating of two roans( unless it is from calving and BW issues, which is another can of worms that I will try to avoid in this discussion!!)
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