Bovine Musculoskeletal Flashcards
What is a common cause on Dairys that rivals Mastitis?
Lameness
How does Lameness impact?
Decreased milk production
Decreased reproduction
What do you look for when examining a cow for lameness?
No head bob Flat back no "hunched" up back Joints flex equally one leg isn't stiffer then the others tracking up - rear feet almost land in foot prints left by the front feet No limping no reluctance to bear weight
Lameness Grade 1
Smooth fluid movement
Lameness Grade 2
Imperfect locomotion but moves freely
Lameness Grade 3
Ability to move freely is compromised
Lameness Grade 4
Ability to move freely obviously diminished
Lameness Grade 5
Must be vigorously encouraged to move
Why is the first effect of Lameness decreased milk production?
cows cannot get to the feed bunk and are painful
What is the appropriate toe length?
7.5cm (3in)
What is the appropriate apex length?
5-10mm
What is the appropriate Head length?
8-15mm
What is the Corium response to increased weight bearing?
Increased rate of horn production
What is the Corium response to imbalance in weight bearing?
overloading of outside claw
What is the Corium response to overloading of outside of claw?
claw conformation change - long toe, high heel
What is the Corium response to increased risk for trauma to corium?
increased risk for ulcer
“Foot Rot”
Interdigital Phlegmon
Foot Rot
Damage to interdigital dermis caused by opportunistic bacterial invasion that creates anaerobic environment causing tissue destruction
What opportunistic bacteria invade the foot to make foot rot?
Fusobacterium necrophorum
Porphyromonas levii
Prevotella intermedia
Score 1 Small Ruminant Foot Rot
Slight to moderate inflammation, some erosion between the claws, no undermining or erosion of skin or horn
Score 2 Small Ruminant Foot Rot
Skin between claws is inflamed and raw, may involve part or all of the soft horn on the inside of the claws, no underrunning of the horn
Score 3a Small Ruminant Foot Rot
Separation of the skin horn junction, with underrunning extending no more than 5mm
Score 3b Small Ruminant Foot Rot
Underrunning no more than half way across the heel or sole
Score 3c Small Ruminant Foot Rot
More extensive underrunning of heel or sole but not extending to the outside edge of the sole of the claw
Score 4 Small Ruminant Foot Rot
The underrunning extends to the outside edge of the sole of the claw and involves hard horn
Score 5 Small Ruminant Foot Rot
severe disease involving the sole, with extensive inflammation and underrunning of the hard horn of the hoof