Identify this instrument:
Roberts Dehorner (aka tube gouge)
Used for very young animals (<2 weeks old or something like that)
Identify this instrument:
Used on animals 3 months to 1 year of age
Identify this big-ass instrument:
- >3 ft handles - very large
- Guillotine cutting with 2 opposing blades that cut the horn when 2 handles are brought together - very sharp cutting blades
- Need to remove base and remove some of skin (1cm) to prevent regrowth
What is a major advantage of using obstetric wire for dehorning?
Can move fast enough to generate friction, which cauterizes and stops the bleeding
What is the primary complication associated with dehorning?
Complications of dehorning:
- Hemorrhage: most common [arteries may need to be pulled or ligated]
- Infection [acute sinusitis]
What are the disadvantages of cosmetic dehorning?
- More time consuming, more complex
- Sterile technique must be practiced because potential for drainage is eliminated
T/F: Polledness is a dominant trait
Polledness is a dominant autosomal trait
What instrument is most commonly used for cosmetic dehorning?
- Clip upper part of head, surgical prep, block
- Large elliptical incision around the horn
- Undermine skin
- Barne’s dehorner
- Closure of skin over sinuses – must make symmetrical - nonabsorbable suture material and close skin over frontal sinus
What is the most common cause of sinusitis in equine patients?
tooth root abscess
What is the most common cause of sinusitis in cattle?
At what age do we typically see tracheal collapse in equine and bovine patients?
Typically seen in calves and foals as a result of traumatic injury. There is usually a history of dystocia, broken ribs, compresion in the birth canal
What are the main physical exam findings associated with tracheal collapse in large animals?
- Inspiratory and expiratory dyspnea
- Poor body condition
- Rib, cranial fractures (forced extraction at birth)
How are these used for tracheal collapse in large animals?
extraluminal tracheal prosthesis
- Stent using 35 to 65ml syringe barrel - size of syringe depends on size of trachea and age of the animal
- Surgery done with animal in dorsal recumbency
- Place syringe barrel around the trachea (after smoothing the barrel and placing holes in it for suture tying)
- May need to remove 2-3 months after placement to allow for unrestricted growth – may lead to collapse in other segments
- Treated calves may be smaller than herd mates
- May need to replace with larger stent - as animal grows, so does trachea, but prosthesis does not - may need a second surgery
T/F: Until 2 months of age, the horn bud is not attached to the skull
Until 2 months of age the horn bud is not attached to the periosteum of the frontal bone
In calves between 4 and 6 months of age, the __________ sinus opens into the horn
In calves between 4 and 6 months of age, the frontal sinus opens into the horn
What nerve(s) need to be blocked for dehorning in the goat?
infratrochlear and lacrimal
Cornual branch of the infratrochlear nerve and the cornual branch of the lacrimal nerve
What nerve(s) need to be blocked for dehorning in the cow?