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Posted by dragon lady on April 17, 2008, 10:27 am, in reply to "PHA - TH"
35.10.40.139
As with any recessive trait or defect - 2 carriers gives you a risk of 25% affected (in the case of PHA oe TH dead), 50% carriers (looks normal genetically carries defect), and 25% genetically and phenotypically normal (looks normal and is genetically normal).
You can think red vs black color for recessive traits - breed 2 black colored red carriers 75% will be black and 25% red - but 2 or 3 of the blacks will carry the red gene.
Also the "risk" is the same for each breeding - so if you have had a PHA calf from the first mating doesn't mean the next 3 are not dead! Risk the same for each mating. Overall it you bred carrier to carrier 100 times the odds would give you 25 dead with PHA, 50 carriers, 25 normals.
I'm with showman - I wouldn't risk it - with PHA you risk both a dead cow and calf....
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