Recessives are somewhat simple—if momma carries it, and
daddy carries it, you have a 50-50 chance the calf will exhibit it. Those recessives noted as “lethal” cause
death.
If you wish to avoid ever having a TH or HCA
afflicted calf, just avoid using carrier bulls on any daughter of a known
carrier.
What is “TH” recessive? Stands for “Tibial Hemimelia” (origin in Shorthorn breed)
Calf will exhibit abdominal hernia,
distorted pelvis and rear legs, exposed brain and/or spine tissue.
Such calves if born alive tend to die
soon after birth.
What is “PHA” recessive? Stands for “Pulmonary hypoplasia and
Arasarca” (origin Maine-Anjou)
Calf will have small lungs, filled
with fluid, and will lack lymphatic system develop.
Such calves tend to be stillborn; a certain percentage of such conceptions may
abort prior to term.
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