Bovine Dermatology

Question 1

What are 5 common dermatological problems in cattle?

Answer 1

Dermatophytosis
Dermatophilosis
Photosensitization
Papillomatosis
Scabby mouth (Contagious Viral Pustular Dermatitis)
(Others: skin lymphosarcoma, anagen defluxion in calves)

Question 2

Name 3 types of dermatophytosis and the species it affects.

Answer 2

1. Microsporon (dogs cats, people)
2. Trichophyton (dogs, cats, horses, cows, humans)
3. Epidermophyton (humans)

Question 3

What is the pathogenesis for dermatophytosis?

Answer 3

Contact causes infection

Fungi attacks keratinized tissues (stratum corneum & hair follicles)

Question 4

What causes Dermatophylosis

Answer 4

A gram +ve bacteria (Dermatophylosis congolensis) which will proliferate in the stratum corneum causing an immune reaction, and severe pain (not pruritic)

Question 5

How do you treat Dermatophylosis

Answer 5

Chlorhexidine shampoo or Povidone iodine shampoo

Systemic - penicillin, oxytetracycline

Question 6

How do you tell if you have Dermatophylosis?

Answer 6

Do an indirect fluorecence antibody test

ELISA (single dilution)

Question 7

What are two things that cause photosensitization? (primary - 2, secondary - 3)

Answer 7

St. John's Wort
Buckwheat
Secondary (hepatitis first)
Hairy panic
Sweet grass
Caltrop

Question 8

Other toxins that cause hepatic damage and possibly secondary photosensitization? (6)

Answer 8

2F, BG HLP
Fungus of facial eczema
Fungus of lupinosis
Blue green algae
Heliotrope
Lantana
Patterson's curse

Question 9

How to diagnose photosensitization secondary to hepatic damage?

Answer 9

Blood tests for liver function/post-mortem examination

Question 10

How to treat for photosensitization? (3)

Answer 10

Move animals to a new paddock
Give them a dark area
Feedthem cereal hay or low-quality (non-green) pasture

Question 11

What is caused by the different papilloma strains (BPV)?

Answer 11

1,2,5 = fibropapillomas

3,4, 6 = true papillomas

Question 12

What do the different papilloma virus types look like?

Answer 12

1
2
3 cutaneous papilloma
4 esophogus to intestine
5 - rice grains - udder
6 - udder & teats - front epithelial

Question 13

Contageous Viral Pustular Dermatitis

Answer 13

Contageous Excema
Pustular dermatitis
Soremouth
Scabby mouth

Question 14

Two forms of bovine lymphoma

Answer 14

1. Associated with BLV

2. Cutaneous form in young animals < 3 years in age

Question 15

What does bovine lymphoma look like?

Answer 15

Plaques 1-5 cm in diameter with a scabby covering; hair is shed

Question 16

Anagen defluxion - what is it?

Answer 16

Areas of hair loss, non-pruriitic

Question 17

Describe the signalment for anagen defluxion

Answer 17

Signs come 7-10 days after the stressor
Sporatic
Calves,
Affects an individual animal in the group.

Question 18

What is anagen defluxion?

Answer 18

Loss of anagen within a few days of a stressful circumstance

Question 19

Diagnostic & theraputic plan for anagen defluxion?

Answer 19

Skin biopsy

Hair will usually regrow within 1-2 weeks

Question 20

Biting cattle louse

Answer 20

Damalinia Bovis

Question 21

Where is Damalinia Bovis found?

Answer 21

Poll, shoulders, back, rump, tail

in line across the back to tail - a biting louse

Question 22

Sucking Lice in cattle (3)

Answer 22

Lingognathus Vituli (line across back, then abdomen)
Solenoptes Capilatus (muzzle, neck)
Hematopinus Eurysternus (line across back to tail head)

Question 23

Life cycle of a bovine flea

Answer 23

Eggs hatch in 5-14 days

Grow to be an adult from an egg in 3-6 weeks

Question 24

Psoroptes ovis

Answer 24

Mange