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bullet"It's All In The Genes"  & "Cowboy Genetics"
Articles by Dr. Lana Kaiser on TH & PHA
Reprinted with permission from the Maine Anjou Voice
(Pictures of both TH & PHA Calves)

bullet Tibial Hemimelia (TH):
Tibial Hemimelia (TH) Carriers in Shorthorn Cattle

ASA Genetic Defect Status List
ASA Genetic Defect Policy
ASA Genetic Defect Protocol

New ASA DNA Procedures
TH Free Sire list on

     Tibial Hemimelia Article
     University of Nebraska's Cattle Congenital Disease Program

     TH = Tibial Hemimelia

Pictures of 3 TH Calves (quite graphic)

     Matings with bulls that are documented TH carriers will result in one of three outcomes:
     1. The calf will be born TH-free; neither afflicted nor a carrier.
         The down side is there is currently no test  that distinguishes this outcome from #2.
     2. The calf will be physically fine, but a TH carrier.
     3. The calf will be afflicted with the characteristics described below.
         TH manifests as:
         1. lesions included bilaterally malformed or absent tibia and abdominal hernia in all animals
         2. a long shaggy hair coat
         3. retained testicles in males
         4. meningocele, which are protrusions of the coverings of the spinal cord or brain.

     Cloning: Something to consider?

     Thanks to Dr. Don Coover, DVM,  for submitting this article:

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