2 Internal Parasites of Livestock Internal Parasites: live within the internal organs of livestockThey are not visibleEffects on the host may be visibleDivided into three groupsRoundwormsTapewormsFlukes
3 Roundworms Most important from economic standpoint Many different typesAffect almost every type of livestock
4 Stomach Worms (Roundworm) Host: Every species of livestockLife Cycle:Adults live in stomach wall.Eggs pass from host and hatch into larvaeLarvae are eaten by animal and travel to stomach where they mature.
5 Stomach Worms (Roundworm) Damage:Penetrate stomach liningReduce digestion of nutrientsYoung undernourished animals are hit the hardestSymptomsAnemia- paleness of gums and white of eyesDull hair coatScoursSevere infestation can cause weight loss and death
6 Strongyles (Roundworm) Host: All species of livestockCattle & horse can build up immunity by ages 4 or 5Life Cycle:Adult is attached to lining of intestinesEggs pass from hostLarvae attach to grass and are eaten by animalPass through stomach and attach to intestinal wall
7 Strongyles (Roundworm) Damage:Most detrimentalAnemiaScar tissue reduces digestion of nutrientsMajor cause of Colic in horsesPoor feed conversionSymptomsAnemiaWeight LossScouringLoss of appetiteProstrationRough hair coat
8 Ascarids (Roundworm) Largest of round worms Can reach 8 to 15 inches in lengthMainly affects younger animalsHost: primarily cattle, sheep, hogs, and horses
9 Ascarids (Roundworm) Life Cycle: Eggs passed in feces contaminate pasturesAnimals ingestLarvae burrow into wall of intestineMigrate to liver, heart, and lungsAnimal coughs up eggs and are swallowedReach intestines a 2nd time and develop into adult stage
11 Pinworms (Roundworms) Small and found in colon or rectum of horsesHost: mainly horses, but can be found in other livestock species.
12 Pinworms (Roundworms) Life cycle:Adult females lay eggs around the anus of horseEggs drop off and contaminate pastures, stables, watering and feeding areaEggs are ingested by animalPass to colon and rectum and mature
13 Pinworms (Roundworms) Damage:Minor damage is causedCause irritation around the tailSymptoms:Tail rubbingWhite scales deposits are visible around anus
14 Habronema (Roundworm) Affects host in two stagesHost: Horse is major hostHouse fly is intermediate host
15 Habronema (Roundworm) Life Cycle:Adult stage is found in stomachLarvae is passed which is ingested by house flyHouse fly deposits eggs on lips of horseHorse swallows eggs and they mature in horses stomach
16 Habronema (Roundworm) Damage:Summer sores can form if larvae are deposited in open woundsDisfigure horsesHard to healSymptoms:Presence of summer soresExcessive tearing and running of eyesOpen sores
17 Lungworms (Roundworms) Affect circulatory system & lungsHost: All species of livestock
18 Lungworms (Roundworms) Life Cycle:Eggs laid in lungs of animalsCoughed up & swallowedEggs hatch in stomach and larvae are passedDevelop in moist earth or waterIngested by animalBurrow into lymph nodes and are carried to lungs where they mature
19 Lungworms (Roundworms) Damage:Mechanical blockage of lungsCollapse of infected areaBlockage of windpipe and broncheaSymptoms:CoughingFast or forceful breathingFeverAnimal reluctant to moveGoes off of feed and water
20 Tapeworms Less important than roundworms 3 species of tapeworms Broad tapewormBeef tapewormPork tapeworm
21 Broad Tapeworm Host: All classes of livestock and also in man Reach up to 10 feet in lengthLife Cycle:Adult lives in small intestineSegments containing eggs break off and pass out of animalEggs are eaten by oribated miteMites are eaten by host and eggs hatch in small intestine
22 Broad Tapeworm Damage: Symptoms No physical damage Tapeworm is in competition with animal for food.SymptomsWeight lossDiarrheaemaciation
23 Beef and Pork Tapeworm Both are similar and almost identical Host: Beef tapeworm- cattle and manPork tapeworm- swine and manMan is necessary intermediate hostReach 5 feet in length
24 Beef and Pork Tapeworm Life Cycle: Adult lives only in man Eggs contaminate the feed of animal through human contactAnimal ingests feed and eggs pass to intestinal wallLarvae lodge in some muscle causing a cystPassed back to man when infected meat is eaten
25 Beef and Pork Tapeworm Damage: Symptoms: Little economic damage to cattleCauses mealy beefSymptoms:No visible symptoms except when animal is slaughtered
26 FlukesSeveral speciesLiver Fluke is the most important
27 Liver Fluke Host: Parasite of cattle, sheep, goats, and man Damaging to young animals
28 Liver Fluke Life Cycle: Adult lives in bile ducts Eggs passed into intestines and passed outEggs must be in water to hatchLarvae hatch and seek a snailLarvae develops on snail and then attaches to a plantAnimals ingest infected plantFlukes pass to intestines and burrow through abdominal cavity to the lungs.
29 Liver Flukes Damage: Symptoms: Irritation and thickening of bile duct Fibrosis of the liverSymptoms:AnemiaWeight lossDeath if not treated.
30 TomorrowWe will go over control methods of internal parasites.