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1. Sam Womble
County Extension Agent –Ag/NR
Bexar County
Some Internal and External
Parasites of Cattle

2. Internal Parasites
Hair (Stomach)worms
Lung worms
Coccidia

3. Hair Worms
Infected cattle pass eggs
in manure, larvae hatch
and move to grass and
are ingested
Mature in 3 weeks
Transmission occurs
when soil temperature is
between 55 and 75 F and
conditions are humid
Larvae die in summer and
hibernate in winter

4. Lung Worms
Lung worms cause a lung
disease in cattle with
clinical signs similar to
those of allergies, viruses
and bacteria.
Transmission is the same
as for hairworms.
Lung worm disease
occurs in previously
unexposed cattle and
calves.

5. Coccidia
Coccidia cause an
intestinal disease of
young cattle
–Transmitted from manure
and ingested
–Rain, cold or stress induced
–Black or bloody scours
–Treatment includes Amprol,
Corid, Deccox, Bovatec and
Rumensin

6. External Parasites
Flies
Mosquitoes
Ticks
Lice
Mites

7. Face Fly
About the size of a
house fly, face flies
are responsible for
transmission of
pinkeye
Control includes
sprays, dusts, oilers
and pour-ons.

8. Horn Fly
Horn flies reproduce in
fresh manure
Bite and suck blood and
irritate animal
Treatment at 250
flies/head (2 hands)
Treatment includes
sprays, dusts and dust
bags, back rubbers, ear
tags, a feed additive
(Altosid), and pour-ons
(with or without
dewormer)

9. Heel (Grub) Fly
Flies lay eggs on heels
of cattle in late winter
and early spring
Eggs hatch and burrow
into skin and travel
through body emerging
in fall along the back
Treatment includes
CoRal, Warbex,
Spotton, Neguvon,
Tiguvon, or Prolate by
early July or Ivomec,
Eprinex, Dectomax and
Cydectin later

11. Mosquito
In addition to blood loss
and irritation mosquitoes
can cause death by
asphyxiation of young
animals
Mosquito control is
difficult and usually
ineffective
–Reduce areas of standing
water
–Remove cattle to other
locations

12. Soft (Ear) Ticks
Spinose ear ticks can
transmit anaplasmosis
and cause nerve and
tissue damage
Use premise control
On animal use CoRal,
Permethrin, ear tags
(not less than 3
months of age!)

13. Hard Ticks
Lone Star and Gulf
Coast ear ticks are
the 2 most prevalent
Use premise control
On animal use
Atroban, CoRal,
Permethrin

14. Lice
Biting (1 specie)
–Feeds on skin and hair
Sucking (5 species)
–Short and long nose (head,
neck and brisket) and
cattle tail louse
Control
–Chemical at 2 week
intervals, some tags or use
Ivomec, Eprinex, Dectomax
or Cydectin
–Mostly problem during
winter and summer months

15. Mites
Feed on surface or
just under the skin
Control with Taktic,
CoRal, Lindane,
Permethrin twice or
with Ivomec,
Dectomax, Cydectin

16. Other Concerns
Bloat –gas accumulates in the animal high on
the calf’s left side
–Feed an ionophore, 1 pt. mineral oil/feeding
Founder –inflammation of the hoof tissue due
to rapid growth
–Anti-inflammatory drugs, remove grain from diet
Foot Rot –caused by bacteria which enters
through a break in the skin or hoof
–Sulfa boluses, anti-bacterial ointment

17. Continued…
Ringworm –caused by a fungus infection of the
skin
–7% iodine, captan, ivermectin
Warts –caused by a virus
–Vaccinate, mineral deficiency, cut them off and feed
to animal
Scours –diarrhea, loose stool caused by abrupt
changes to feed and/or stress
–Sanitation, antibiotics, electrolytes, probias

18. Questions?