1. Cattle Parasites

2. Intestinal Nematodes Loss of appetite Immuno-suppression
Destruction of gastric glands and interference with protein digestion
Loss of tissue fluid

3. Strongyles
Over 30 different genera and/or species of intestinal nematodes which have eggs that look similar.
“Strongyles or strongyle-type eggs”
In general, treated the same
Digestive tract
May compete for nutrients, cause tissue damage, or suck blood (anemia)

4. Strongyles

5. Trichostrongyles Ostertagia ostertagi
Recognized as the most important nematode parasite of cattle raised in temperate climates
Can developmentally arrest
Large economic impact on cattle industry – treatment and prevention costs

6. Ostertagia ostertagi Brown stomach worm 6-10 mm
Larvae destroy gastric glands
Severe diarrhea & weight loss
Fecal flotation
Tx: Albendazole, Fenbendazole, Ivermectin, Moxidextin

12. Cooperia spp. Cattle bankrupt worm 4-8 mm D+ Anorexia Depressed growth
Synergistic with Ostertagia ostertagia
Fecal flotation
Tx: Albendazole, Fenbendazole, Ivermectin, Moxidectin

14. Bunostomum spp. Hookworm 10-28 mm Anemia D+ Weight loss
Fecal flotation
Tx: Albendazole, Fenbendazole, Ivermectin, Moxidectin

16. Trichuris ovis Whipworm 2-3 mm Rarely pathogenic Fecal flotation
Tx: Fenbendazole, Ivermectin

19. Capillaria sp. Capillary worm 5-8 mm Mostly nonpathogenic
Fecal flotation
Tx: None tested

20. Dictyocaulus viviparus
Lungworm
3-8 cm
Cough
Dyspnea
Lethargy
Baermann technique, fecal flotation
Tx: Albendazole, Fenbendazole, Ivermectin, Moxidectin

22. Fasciola hepatica Common liver fluke 3-4 cm Hepatic trauma Hepatitis
Death
Fecal sedimentation
Tx: Albendazole, Clorsulon, Nitroxynil, Raoxanide

25. Moniezia benedeni Tapeworm Up to 100 cm Mostly nonpathogenic
Proglottids on stool, fecal flotation
Tx: Albendazole, Dichlorophen, Fenbendazole, Niclosamide

28. Tritrichomonas foetus
Protozoan
10-25 um
Early abortion storms
Pyometra
Preputial washings & culture
Tx: Ipronidazole, Metronidazole

31. Babesia bigemina Babesia, Texas Cattle Fever 2-3 um x 4-5 um Anemia
Splenomegaly
Blood smear
Tx: Antibiotics, Dip for ticks

33. Eimeria spp. Coccidia 16-47 um x 13-32 um Bloody diarrhea Death
Decreased production D+
Fecal flotation
Tx: Amprolium, Sulfamethazine

35. Cryptosporidium spp. Crypto 6 um x 6 um Zoonotic D+ Fecal flotation
Tx: Supportive care

36. Cochliomyia hominivorax
Screwworm
Up to 15 mm
REPORTABLE
Maggots penetrate tissue
Identify larvae
Tx: Ivermectin, Organophosphates

37. Cochliomyia hominivorax
Female can lay up to 500 eggs per day
Eggs hatch ~ 12 hours
Larvae feed and produce dark, foul-smelling liquid which attract more flies – can quickly become infested with thousands of larvae
Larvae feed for 5-7 days before dropping to ground as pupae
Pupae hatch into adults ~ 7 days

41. Sarcoptes scabiei Mange mite REPORTABLE in some states Skin scraping
Tx: Ivermectin, Eprinomectin, Doramectin

43. Cattle Grub or Warbles Hypoderma bovis or Hypoderma lineatum
Significance: hide and flesh damage = economic loss, irritation = weight loss and decreased milk production
Diagnosis: look for breathing pores or eggs on coat
Treatment: Avermectins

44. Cattle Grub