Need some Homo Polled assistance

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Gators Rule

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1. If I have a cow who is AI sired by Dream On, who is Homo Polled, and breed her live cover to a son of Ranch Hand (Ranch Hand is also Homo Polled), what is the likelihood that the resulting calf will have horns?

2. Same scenario, but the resulting calf is scurred?

We are talking about PB Simmy's.

thanks,
 
What is that cow? Dream On to the cow gives you a 50% chance of being polled same goes with Ranch Hand depending on that cow's make will add to the equation.
 
If the cow is hetro polled bred to homo polled bull calf will be polled. Unless the cow is scurred. If the cow is scurred and the resulting calf is a bull calf it will be scurred. polled and horned genes work the same in any breed unless the African horned gene is involved.
 
50% not knowing what the cows dam was. In other words if she was hetero polled and bred to a homo polled bull her offspring has a 50/50 shot at being hetero or homo. Any homo crossed on any hetero will give the same odds. Recessive genes can hide for a very long time. Just because the odds say 50%, that doesn't mean that you couldn't breed to a horned bull and get 9 polled calves in a row. That's what makes it so hard with cattle without genetic testing. If you were breeding rabbits, a couple litters will tell you if a recessive trait is present, a cow might not live long enough to throw a recessive.
 
Yep. Depends on what's behind the cow, and behind the dam of the Ranch Hand son(I'm presuming he's polled?). If either of those 'girls' are 'hiding' the horn gene, you've got a 0 to 25 to 50% chance at a horned calf.
Scurs 3 generations back behind Dream On, 1 generation back behind Ranch Hand...so they could be in the mix.

Horn gene and scur gene are separate traits. http://homepage.usask.ca/~schmutz/polled.html
If you have a calf with scurs, they are hetero polled(horn gene carrier) but if homo polled, the scur gene may be sliding along unexpressed, and can show up in later generations, when a calf inherits the horn gene from a parent. A male only requires one copy of the scur gene to have scurs, females must have two copies...but if they have scurs, they are hetero polled.

I have a daughter of GAR Yield Grade(Angus), out of a smooth-polled AngusXSimAngus dam... who has scurs. So...she inherited one copy of the scur gene from her dam, and one copy from Yield Grade(yes, some Angus cattle carry the scur gene). Has not produced a horned or scurred calf, but has only been bred to smooth polled bulls(some have been hetero polled) - but as andyva says... since a cow only has just so many calves in her lifetime, she might be a carrier and never produce a calf with either of those traits...
 
Both cows themselves are polled, but I do not know if they are Homo or not. After two groups of calves by this bull, these are the first two with horns in any form that I've had. Incidentally, these are the also the first two that are not solid black. They are black Baldy.
 
If either the cow or the bull is homo polled the calves will be polled, polled is dominant. But the offspring could be either homo or hetero polled if the cow or the bull is hetero polled.
 
http://www.cals.ncsu.edu/an_sci/extension/animal/news/aug96/aug96-3.html

Genetic Expression of Polledness or Horns and Expected Inheritance by Offspring
Sire-----------------------------Dam-------------------------------------Calves

Homozygous polled (PP)-----Homozygous polled (PP)------------100% Homozygous polled (PP)


Homozygous polled (PP)-----Heterozygous polled (Pp)-----------50% Homozygous polled (PP)
---------------------------------------------------------------------------50% Heterozygous polled (Pp)
 
tja477t":2rh2vsz8 said:
http://www.cals.ncsu.edu/an_sci/extension/animal/news/aug96/aug96-3.html

Genetic Expression of Polledness or Horns and Expected Inheritance by Offspring
Sire-----------------------------Dam-------------------------------------Calves

Homozygous polled (PP)-----Homozygous polled (PP)------------100% Homozygous polled (PP)


Homozygous polled (PP)-----Heterozygous polled (Pp)-----------50% Homozygous polled (PP)
---------------------------------------------------------------------------50% Heterozygous polled (Pp)
The genes the offspring carry are correct, but with either side homo polled all of the offspring will be polled. Polled is still dominant.
 

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