Factor XI deficiency
(Holstein cattle)
An autosomal recessive defect reported in Holsteins in North America and Europe. The mutation responsible for the defect has been defined. The mutation has been detected in Holstein bulls in Australian artificial breeding centres.
Diagnosis
History of extended bleeding following dehorning, at parturition, or into milk at the onset of lactation.
Specimens required
See Collection of hair samples for DNA testing
- 20 to 25 hairs, with roots attached, from the distal end of the tail.