Lameness Flashcards
What are the risk factors for sole ulcers/haemorrhage?
- Walking and standing for long periods on hard surfaces, especially post-calving
- Periparturient increase in movement of the pedal bone
- Loss of fat from the digital cushion and new bone formation on P3
How can you reduce the incidence of sole ulcers in the dairy herd?
Promote lying and make use of rubber matting.
Cubicle train heifers
Group fresh cows together
What bedding promotes the longest length of lying time?
Proprietary cow cushions
What are the general aims of foot trimming?
Maintain optimum weight bearing and foot balance
What are the risk factors of white line disease?
- Periparturient increase in movement of the pedal bones
- Loss of fat from digital cushions
- Poor underfoot condition
- Presence of small sharp foreign bodies in the environment
- Turning sharper on concrete surface
What is the ideal track to promote healthy feet?
Cushioned for comfort, wide (3.5m), no sharp turns, quick drying, good grip but not abrasive, cheap, for cow use only
What management techniques can increase the risk of white line disease in dairy cattle and why?
Pressuring cows with motorbikes, dogs and sticks.
Prevents them watching and controlling foot placement.
What should be put down if cattle need to cross the road?
Carpet
What resources can increase the incidence of bullying in a herd?
Space, feed, cubicles, parlour, water, licks, grooming posts and brushes
What supplement can be added to the diet to aid a reduction in white lines disease?
Biotin - 20mg/cow/day
Where are the risk factors for digital dermatitis?
Housing
Wet and dirty conditions, scrapers
Herd/expansion/poor biosecurity
Younger cows
High production
What is the general rule for quantities of footbath solution?
1 cow passage per litre of footbath
What 2 products are typically used in a footbath?
Formalin 2-5%
Copper or zinc sulphate 5%
In what age of calves is septic arthritis most common?
Less than 3 weeks of age
What is the treatment for septic arthritis in calves?
Analgesia (NSAIDS), antibiotics (oxytetracycline), joint lavage, supportive care
What is the most common cause of septic arthritis in calves?
Truperella pyogenes (gram positive)
What deficiency causes white muscle disease?
Vitamin E/selenium
What are the pre-disposing factors for white muscle disease?
Young, fast growing animas (calves <6 months)
Sudden expectation of exercise
What are the clinical signs of white muscle disease?
Recumbency and difficulty standing.
Stiff, trembling legs
Weakness
Rotation of distal hindlimbs from hocks
Gluteal, shoulder and dorso-lumbar musculature palpably enlarged and firm
What is seen on clinpath in white muscle disease?
Urinalysis: Myoglobin
Biochemistry: Elevated CK and AST. Low selenium or glutathione peroxidase
Liver biopsy: Low selenium/vitamin E
What calf fracture types are good candidates to cast or splint?
Transverse/short oblique
Salter-harris type 1 and 2 growth plate fractures
Closed
What bacterium causes blackleg?
Clostridium chauvoei
What pathology is associated with blackleg?
Severe necrotising myositis, severe lameness and upper limb swelling, sudden death
What is the treatment for blackleg?
High dose penicillin - double dose for 12 to 24 hours
What is osteochondrosis dissecans?
Foetal defect in articular cartilage resulting from failure of blood supply development during ossification.
Young, fast growing animals
What NMSK mechanism is crucial in the maintainance of healthy feet?
Suspensory apparatus
What are the three gradings of sole ulcer?
Mild - incorporation of blood into horn as sole is produced
Moderate - Partial/intermitted interruption of horn production at sole ulcer site
Severe - horn production completely arrested at sole ulcer site for prolonged periods
What are the 3 animal types presenting with digital dermatitis?
- Does not develop M2 lesions but can show M1 or M4
- Single episode of M2, followed by a prolonged period of absence of acute DD
- Repeat episodes of acute M2 lesions