Food Animal Disease Of The Digits And Distal Limbs

Front 1

Footrot pathogens

Back 1

Fusobacterium necrophorium - Gram negative
Baceteroides melanogenicus - Gram positive

Obligate anaerobes
Normal GI flora

Front 2

Footrot clinical signs

Back 2

all ages
may be sudden
usually one limb
swelling, redness and pain in interdigital area
skin fissures into subcutaneous tissue
necrotic tissue around edges of lesion

Front 3

Footrot pathogenesis

Back 3

F. necrophorum rpoduces a leukotoxin that protects both agents form phagocytosis and is responsible for necrosis

B. malnogenicus (P. levi) produces proteolytic and collagenolytic enzymes that attack the subcutaneous tissues - and spreads disease

Front 4

Footrot TX

Back 4

Oxytetracycline - 28 withdrawl time
Ceftiofur - good for dairy cattle - short withdrawl time
PPG - LONG withdrawl time but good for anaerobes, give every day.

Front 5

Footrot Prevention

Back 5

Management, Foot baths,
Vaccinate? Trace mineral supplements

Front 6

Interdigital dermatitis

Back 6

Acute to chronic inflammation of interdigital skin.
Does NOT extend into subQ tissues.
Results in heel horn erosion and undermining of the heel bulbs

Front 7

Interdigital dermatitis - Bovine contagious interdigital dermatitis pathogen

Back 7

Dechelobacter nodosus + others

Front 8

Difference between Footrot and interdigital dermatitis

Back 8

Footroot from ubiquitous pathogen that gains entry due to trauma. Has necrosis
Interdigital dermatitis is contagious with no necrosis.

Front 9

Interdigital dermatitis TX

Back 9

Terramycin in medicated feeds
Footbaths
Systemic AB not as beneficial unless spread to deeper tissues.

Front 10

Contagious footrot in sheep

Back 10

interdigital dermatitis with extension into adjacent epidermal tissue underlying the hard horn

Front 11

Contagious footrot in sheep pathogens

Back 11

Dichelobacter nodosus - infected sheep are only source
Fusobacterium necrophorum -
Actinomyces pyogenes - produces a factor that stimulates growth of F. necrophorum

Front 12

Contagious footrot in sheep TX

Back 12

Carrier sheep + warm environment + abundant moisture = spread of disease through flock.

Front 13

Contagious footrot in sheep tx

Back 13

Radical hoof trimming
Foot baths - ZnSO4
ABX - PPG, Oxytet
Cull - infecting everyone else

Front 14

Papillomatous digital dermatitis - hairy heel warts

Back 14

transmissible dermatitis on the plantar/palmar surface of the pastern and on the heels. Complete erosion of the peidermis that is replaced by granulation tissue.

Front 15

papillomatous digital dermatitis etiology

Back 15

spirochete - treponema
Zn - deficiency

Front 16

PDD Clinical signs

Back 16

painful to touch
lame
ulceration around the ocronary band in the bulb area
Washcloth like in texture

Front 17

PPD TX

Back 17

Ceftiofur crystalline free acid - excede
tulathromycin - draxxin both resolve lameness in about 10 - 14 days.
PPG and Oxytet not effective