Section 2: Metabolic Diseases of Ruminants: Laminitis (Donovan) Flashcards Preview

Nutrition > Section 2: Metabolic Diseases of Ruminants: Laminitis (Donovan) > Flashcards

Flashcards in Section 2: Metabolic Diseases of Ruminants: Laminitis (Donovan) Deck (19):
1

Typical PE of cows with laminitis

swelling above coronary band (20%)
thin soles (55%)
white line separation (25%)
wall cracks/erosions (20%)
subsolar abscesses (40%)
secondary trauma to hocks

2

laminitis

diffuse, aseptic inflammation and degeneration of metabolic origin affecting the sensitive laminae of the foot

3

junction b/w corium and horn of hoof is called:

dermal-epidermal junction

4

4 categories of causes for laminitis

1) nutritional
2) environmental
3) animal
4) infectious

5

environmental causes

-excessive solar wear
-excessive wetness

6

what is the weight-bearing surface of cow's feet?

the WALL

7

animal causes

-inherited factors
-low exercise
-unbalanced weight
-behavioral chars.

8

infectious causes

-endotoxemia
-high fever

9

nutritional causes

-excessive feeding of energy/protein during peripartum
-low dietary fiber
-slug feeding

10

how does feeding lots of soluble CHO cause laminitis? **

rapid ferm. in rumen --> decrease rumen pH --> release of endotoxins and histamine --> vasoconstriction --> laminitis and respiratory signs

11

process of dermal-epidermal jx separation

1) vasoconstriction of corium
2) hypoxia of corium
3) inflammation of corium
4) swelling/hemorrhage in corium

12

acute laminitis clinical signs (uncommon)

-feet sensitivity
-reluctance to move
-arched back
-digital puls
-swelling above coronary band
-sinking of pedal bone
-listless
+/- fever
-decreased milk prod.

13

subclinical laminitis is common!

:)

14

chronic laminitis clinical signs

-abnormal horn growth
-white line sep.
-subsolar absess
-sole ulcer at insertion of flexor tendon (result from pinched corium no longer producing horn) *
-septic arthritis
-2ary trauma hocks and carpi

15

tx for acute laminitis

rumen buffers, antihistamines, corticosteroids, NSAIDs, comfortable footing, control infections/toxemia

16

tx for chronic laminitis

-get off concrete
-correct foot trimming
-pare out ulcers/abscesses
-block foot
+/- bandage feet, antibiotics, claw amputation
-cull

17

most expensive disease of cows

sole ulcers

18

laminitis prevention *

-avoid sudden feed changes
-maintain adequate fiber (>22% EffNDF ********)
-feed TMR
-avoid finely chopped feeds
-avoid acidotic rations
-add buffers to ration
-adjust cattle to concrete surfaces
-keep feet dry as possible

19

how much weight on cow's back feet?

65%!