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144 Cards in this Set

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What are the 3 parasites that most commonly cause liver disease in large animals?
1) *Fasciola hepatica
2) Fascioliodes magna
3) Dicrocoelium dendritium
-usually normal flora in the liver and don't cause pathology, but if have them probably have hepatica too
Why is the liver so important in ruminants?
***ruminants do not absorb glucose, need liver to make glucose
Why do we worry about liver flukes in large animals?
Flukes migrate and create an anaerobic environment---> clostridial infections
Where is Fasciola hepatica distributed?
South central US and Florida, Pacific NW
-depends on distribution of intermediate host
What is the intermediate host of fasciola hepatica?
Snails
-where fasciola hepatica does a lot of asexual reproduction
What type of weather do snails, the intermediate host of fasciola hepatica, live in?
-Small temporary water habitats
-Prefer habitats wet for > 6 months / year
True or false. Fasciola can be introduced to a new area in livestock and infect local species of snails.
True, and infected snails can introduce fasciola to new areas
-so if snails brought in on truck can infect pasture
Why is the transmission of F. hepatica different in the wet northwest and the wet southeast?
Because important part of life cycle of snail is that it depends on the number of days above 50 degrees
-need like 14 or 21 days above 50 degrees, 24 hours a day
How is the seasonality of F. hepatica different in tropical regions?
They're always present, bc it's above 50 degrees year round and wet
**How long does it take for F. hepatic to reach the liver after the metacercarie are ingested on the vegetation?
Takes 6-7 weeks to see liver flukes
How long does it take F. hepatica to reach sexual maturity once inside the liver?
2-4 weeks*****
How long does it take after ingestion of metacercariae on vegetation before you can diagnose F. hepatica?
6-7 weeks + 2-4 weeks= 8-11 weeks before can diagnose
-unless do a liver biopsy then can diagnose after 6-7 weeks
What are the 3 ways clinical disease of F. hepatica can present?
1) Subclinical disease and production loss
2) Anemia, ill thrift and hepatic dysfunction due to fluke migration and feeding
3) Acute illness and sudden death from Cl. novyi and Cl. haemolyticum
Why can F. hepatic result in production loss?
Because the liver is there to make glucose, so results in production loss
How can you tell an animal is ill-thrift? (i.e. what are some clinical signs of an ill-thrift animal?)
Skinny, poor haircoat
-in beef cattle see the rate of daily gain decrease
-Dairy cows have decreased milk production
-might se abortion or issues w/ reproduction if not enough glucose
How do animals present with black disease? Red water?
Black disease: Dead- black on ventrum from bruising and hemolysis from hemorrhage

Red water: dead w/ hematuria
What kills an animal with a clostridium infection? Is it the bacteremic shower or acute toxemia?
it's the acute toxemia that kills the animal, not the bacteria
Can you diagnose C. haemolyticum (Bacillary hemoglobinuria) with a urinalysis?
NO, toxin is present in urine, not the organism
F. hepatica commonly causes subclinical infection, what are the only clinical signs?
Reduced weight and feed efficiency
In cattle, economic loss occurs with > or equal to ______ flukes/ animal.
40
Clinical disease occurs in cattle with > or equal to ______ flukes/ animal.
200
What are the clinical signs of subclinical disease due to F. hepatica? (3)
Poor condition, reduced lactation and slower return to estrus in breeding cattle
-can look at how much food they're given : how much they're growing
What are 6 differential diagnosis for cattle with poor condition, reduced lactation and slower return to estrus in breeding cattle, especially in the SE USA?
1) F. hepatica
2) BVDV
3) IBR (Bovine herpesvirus-1)
4) Leptospirosis*
5) Neospora*
6) Fescue toxicity**
-estrogen like toxin
What cattle will first show clinical signs of F. hepatica?
Those with the heaviest burden
What are the clinical signs of F. hepatica (like those cattle w/ heaviest burdens)?
-Weight loss, emaciation, depression, anorexia, rough coat
-anemia, hypoproteinemia, 'bottle jaw'
-rarely mild icterus
Why do you get hypoproteinemia w/ liver flukes?
Because damaging the liver= major production organ of proteins in the body
What are 5 differential diagnoses for a young cow with low protein and submandibular edema?
1) Ostertagia ostertagia
2) BVD*
-protein losing enteropathy
3) Salmonella
-diarrhea
4) Coronavirus
-winter dysentery
5) Iatrogenic: too much fluids
*not Johne's= cows 2-3 years old
*E. coli= calves < 5 days old
Why do we rarely see bilirubinuria or therefore icterus in cattle?
Rumen microbes use up all the bilirubin
-don't even usually see icterus w/ high bilirubin
Are sheep and goats more or less susceptible than cattle to F. hepatica?
More susceptible
Why can flukes be fatal in sheep & goats?
Fluke entry to bile ducts can be fatal
-ascites, hemoabdomen, pallor and icterus if heavy burden of 1000-5000
What type of disease is more common in small ruminants with F. hepatica? What are the clinical signs?
Chronic disease
-burdens > 200 flukes
-edema, ascites, emaciation (can get right sided heart failure)
-extensive fibrosis occurs as liver heals
Why do small ruminants get higher fluke burdens of F. hepatica than cattle?
Don't develop immunity like cattle do
-also why they tend to get chronic disease
What are 4 ways that disease results from F. hepatic results from maturation of the flukes in bile ducts?
1) Hyperplastic cholangitis
2) Plasma protein loss
3) Blood loss
4) Flukes produce proline which creates depression anemia and biliary hyperplasia
How long does it take cattle to mount an immune response to F. hepatica infection?
5-6 months post infection
-****few flukes survive > 12 months
-after 12 months worry about secondary healing of liver
What are 3 reasons that fluke maturation in bile ducts results in blood loss?
1) Lack of clotting factors
2) Blood cells get sheared in liver
3) Hemolysis
**blood loss from hemolysis and hemorrhage
What are 4 components of diagnosing F. hepatica?
1) History and geographic area
2) Clinical signs
3) CBC and chemistry
4) Fecal sediment examination for ova
*not fecal float
What do you see on CBC and chemistry of an animal with F. hepatica infections?
-anemia, hypoproteinemia
-mild eosinophilia
-elevated heaptic enzymes: **GGT (parasites crawling through bile ducts), next look at SDH
Secondary: AST, ALP
True or false. Fecal floats diagnosis trematodes not nematodes.
False, Does not find trematodes, but does find nematodes
-hence fecal floats do not work to diagnose F. hepatica
When performing a fecal sedimentation F. hepatica must be distinguished from What? Why?
Paramphistomum is smaller, rounded and nonpathogenic rumen fluke
-these 2 are often transmitted together bc same climate and intermediate host, so presence of paramphistomum may indicate presence of F. hepatica
Why do you have to treat animals with F. hepatica at least twice?
Because flukecides do not kill the larvae, so must kill the adults, then wait and retreat
What are the 2 antiparasitics used to kill F. hepatica flukes?
Albendazole and clorsulon
What is the optimal timing for using albendazole or clorsulon to treat F. hepatica flukes?
Time treatment to ensure susceptibility (flukes >12 weeks after transmission season) but remove while < 6 m old and less pathogenic
***What is the only flukecide for F. hepatica that can be used in lactating animal?
Albndazole****
What determines if cattle need twice a year treatment for F. hepatica?
Burden load and hence the year (climate)
How can you prevent F. hepatica?
Single treatment in fall or early winter after transmission season kills adults before winter stress
-prevents egg shedding and snail infection next season
2) Fence off or drain snail habitat
3) pasture rotation
4) Molluscides (toxic to fish & wildlife)
5) public fluke monitoring
-talk to neighbors
What an you do differently to prevent F. hepatica on high risk properties or in high risk years?
-spring treatment on high risk properties or in high risk years to remove flukes acquired during late extended transmission on irrigated pastures or wet coastal regions
-check 10 random animals
How do the tunnels of coagulative necrosis from F. hepatica appear on necropsy?
-Diffuse hepatic fibrosis, particularly ventral lobe
-can cause liver condemnation
What are 3 findings on necropsy that are due to mechanical damage and feeding and growth of F. hepatica flukes in the biliary tract?
1) Proliferative cholangiohepatitis
2) Fibrosis and thickening of ducts w/ eventual calcification (in cattle)
3) Dark bile- excreted fluke products
What is the common name of Fascioloides magna?
Large american liver fluke
What animals are affected by F. magna?
Sheep and cattle grazing common areas w/ natural hosts
-deer, elk and moose
F. magna and F. hepatica have similar life cycles, but how is F. magna different?
Greater number of and variety of snail hosts
-broader geographic distribution since hosts tolerate a wider range of habitat and temperature
What type of host are cattle for F. magna?
Dead end hosts
-rapidly encapsulate parasite
True or false. F. magna can be diagnosed in cattle via fecal sedimentation.
False, cannot be diagnosed bc of a lack of fecal egg production
What is the main significance of F. magna infection in cattle?
Condemnation of liver and other organs
Is F. magna a bigger issue in small ruminants or cattle?
SHEEP AND GOATS
-parasite has unlimited migration
-1-2 flukes can kill or cause severe hepatic insufficiency
What is the treatment for F. magna in sheep and goats?
Albendazole
-avoid early in pregnancy
What is the common name for Dicrocoelium dendriticum?
Lancet fluke
Compare the disease of dicrocoelium dendriticum to that of fasciola flukes.
Chroinc, less severe disease
What is the relative size of dicrocoelium dendriticum?
Small fluke (<1 cm)
What is the intermediate host of Dicrocoelium dendriticum?
Indirect life cycle w/ snail and ant hosts
What type of host are goats, sheep and cattle for dicrocoelium dendriticum?
Definitive hosts
Where do adult Dicrocoelium dendriticum reside in the body?
In bile ducts and shed eggs
What is the life cycle of dicrocoelium dendriticum? (5)
-eggs ingested by snails--> cercariae
-cercariae expelled & ingested by ants
-infectious metacercariae develop in ants and cause paralysis
-ants ingested by grazing livestock
-Young flukes excyst in SI and enter the common bile duct to migrate to the liver
What is the prepatent period of Dicrocoelium dendriticum?
8-12 weeks
Dicrocoelium dendriticum are common in ______.
North america
-prevalence as high as 45% in endemic areas
Dicrocoelium dendriticum are less pathogenic, but can be present in high numbers. So what kind of damage do they cause?
Progressive inflammation of the biliary tree, cirrhosis and hepatic insufficiency
What are the clinical signs of Dicrocoelium dendriticum? (5)
Weight loss
Depression
Anemia
Hypoproteinemia
Submandibular edema
How do you diagnose Dicrocoelium dendriticum?
*Fecal sedimentation
-eggs are smaller, dark brown, operculated
What are the 4 differential diagnoses for Dicrocoelium dendriticum?
1) Nematodes
2) Trematodes
-F. hepatica
-F. magna
3) Bacterial
4) Viral
When and what do we use to treat Dicrocoelium dendriticum?
Albendazole, base treatment on using it on animals with highest worm burdens
What are the 4 scenarios where large animals tend to get hepatic lipidosis?
1)Fat cow syndrome of dairy cattle
2) protein energy malnutrition of beef cattle
3) pregnancy ketosis or 'twin lamb disease' of ewes and does
4) hyperlipidemia/ hyperlipemia of equids
What is the normal consequence of a negative energy balance in a large animal?
-minor drop in blood glucose and drop in the insulin: glucagon ratio
-hormone sensitive lipases convert fat to FFA's and glycerol
-mobilization of FFA to liver results in triglyceride storage in cells w/ eventual export as VLDL's
What goes wrong with normal pathophysiology that results in hepatic lipidosis?
Lipidosis occurs when hepatic triglyceride formation exceeds FA oxidation and release of VLDLs
Why do ruminants tend to get hepatic lipidosis?
Have poor ability to export VLDL's possibly due to inadequate production of apolipoprotein A
What are 7 options for treating hepatic lipidosis?
1) Eliminate negative energy balance and the factors creating it
2) IV glucose infusion (most common)
3) Insulin
4) Niacin (B3)
5) Corticosteroids
6) Vitamin E/ Se
7) Transfaunation
Why do we give IV glucose infusion to patients with hepatic lipidosis?
-Give some nutritional support
-Can increase Insulin: glucose ratio to decrease hormone sensitive lipase mobilization of FFA's and may stimulation production of VLDL's= trying to stop fat mobilization
Why do we give insulin to patients with hepatic lipidosis?
To alter the insulin: glucagon ratio directly
Why can niacin (B3) be given to patients with hepatic lipidosis?
May reduce tissue lipolysis and fat load presented to liver
-better preventative
Why do you give an animal with hepatic lipidosis corticosteroids?
Increase appetite
Reduce milk production
Induce gluconeogenesis
Why do we give vitamin E and selenium to animals with hepatic lipidosis?
Free radical scavengers
What's the purpose of transfaunation in an animal with hepatic lipidosis?
Enhance forestomach digestion and absorption of VFA's for energy and glucose precursors
What is fat cow syndrome?
Multifactorial condition characterized by mobilization of fat to the liver of post parturient dairy cows
Why do cows with Fat Cow Syndrome get fat in the first place?
They have too long of a lactation, when get long into lactation they are still on lactating cow diets= too many calories in and not enough calories out bc not producing enough milk
Why do cats with Fat Cow Syndrome mobilize fats?
Because when long in lactation or long dry off and eating lots of food and not making much milk and then go into next lactation (freshen or calf= high stress time) so start milking and metabolic demand goes way up before appetite does = ketosis
Why is it a problem when cows with Fat Cow Syndrome mobilizes fats?
If overconditioned cow and start mobilizing fats then lipoproteins go into liver to be repackaged and used because not taking in enough food
-cows are really poor at making lipoproteins in liver so all the mobilization of fat gets stuck in the liver
***Doesn't happen in horses or cats
Fat Cow Syndrome is complicated by concurrent ________ disease that result in reduced feed intake and further increase energy demand.
Peri-parturient diseases
What is type I ketosis? What's the treatment?
Primary (lots of milk not enough appetite), happens b/w 7-10 days after freshening
-just give glucose
What is type II ketosis?
Ketosis due to some other reason- like liver not working because full of fat, low calcium, retained placenta (can cause displacement of abomasum then not eating at all and get mobilization of fat)
-happens 3-5 days after calving
You are examining 3 cows, with BAS scores of: 1.5, 3, and 4.5. If one of them has a peri-parturient disease, which one would you suspect has it?
The 1.5, can see all the transverse processes
What is the number range for BAS scoring of beef cattle?
1-9 scale
Dairy cows= 1-5
What are 5 components that will help diagnose Fat Cow Syndrome?
1) Physical exam
2) Liver enzymes frequently normal
3) Possible hypoglycemia
-but usually have stress response
4) *Ketonuria
5) Refractory to treatment
6) Liver biopsy
-problematic
Why is a liver biopsy problematic when trying to diagnose Fat Cow Syndrome?
-Lipidosis (15-30%) present in normal cows
-Liver fat values > 34% correlate to clinical signs
-don't usually biopsy
What are the 3 ketones present in the urine?
Acetate
Beta-hydroxybutyrate
Acetoacetate (what's measured with strips)
What is the prognosis of Fat Cow Syndrome?
Guarded- mortality 25%
What is the treatment for Fat Cow Syndrome?
Identify and treat any predisposing disease
-address negative energy balance and lipidosis
How do you prevent Fat Cow Syndrome?
-Dietary management of stock during late lactation and dry period
-Prompt treatment of peri-parturient diseases
-adequate protein is critical in the dry period
What will pathologies will you find in a liver of a cow that suffered fat cow syndrome on necropsy? (3)
1) Enlarged yellow and swollen liver
2) Floats in formalin
3) Fatty infiltration of hepatocytes
*Search carefully for other diseases
How do you diagnose ketonuria in a cow with Fat Cow Syndrome?
Ketone strips
Why can't you use prednisolone in ruminants?
Don't use oral corticosteroids bc of the rumen
How do you prevent Fat Cow Syndrome?
-Dietary management of stock during late lactation and dry period
-Prompt treatment of peri-parturient diseases
-adequate protein is critical in the dry period
How can you make sure to prevent obesity in late lactation?
-12-13 month calving interval
-match requirements to milk production in late lactation
-make changes before the dry period
What will pathologies will you find in a liver of a cow that suffered fat cow syndrome on necropsy? (3)
1) Enlarged yellow and swollen liver
2) Floats in formalin
3) Fatty infiltration of hepatocytes
*Search carefully for other diseases
How do you diagnose ketonuria in a cow with Fat Cow Syndrome?
Ketone strips
Why can't you use prednisolone in ruminants?
Don't use oral corticosteroids bc of the rumen
How can you make sure to prevent obesity in late lactation?
-12-13 month calving interval
-match requirements to milk production in late lactation
-make changes before the dry period
How do you make sure to provide adequate protein during the period in order to prevent Fat Cow Syndrome?
-Good quality roughage
-Additional grain 2-4 weeks prior to calving to allow adjustment to the expected post calving ration
What animals get protein- energy malnutrition?
Disease of pregnant beef cows on marginal diets
When do the signs of protein-energy malnutrition arise?
In winter
What are 3 reasons that protein-energy malnutrition arises in winter?
1) Increased energy demands from inclement weather and developing fetus
2) Heifers predisposed (growth demands)
3) Primary diseases, snow cover, unpalatable feed
What are the clinical signs of protein-energy malnutrition?
Syndrome of weight loss, weakness and depression
-animals often thin w/ a long hair coat
-Die in 7-14 days of becoming recumbent
What are 4 components of diagnosing protein-energy malnutrition?
1) Rule out other possible causes
-keep open mind
2) Demonstrate inadequate caloric intake
-take feed samples, pictures, look at whole property
3) Ketonuria unusual
-bc no energy drain
4) Look for metabolic bone disease
-Cows with huge heads- not enough calcium and too much phosphorus--> bony proliferation
Is treatment of protein-energy malnutrition very successful?
No, usually difficult and unrewarding
What are 3 components of treating protein-energy malnutrition?
1) Force feeding alfalfa slurry
2) Propylene glycol
-glucose precursor
3) Address concurrent disease (s)
-micronutrient deficiencies
What are 3 findings on necropsy of an animal with protein-energy malnutrition?
1) Atrophy of fat
2) Pathologic fractures
3) Poor rumen development
What are 4 ways to prevent protein-energy malnutrition in beef cattle?
1) Appropriately address energy requirements of 3rd trimester and in cold weather
2) Provide good quality forage in adequate amounts
3) Maintain good BC scores (5-7) in cows entering third trimester
4) Look at your cattle
When does pregnancy toxemia occur in ewes and does?
Final 2-4 weeks gestation
What is the pathophysiology of pregnancy toxemia?
Inability to meet energy demands w/ rapid fetal growth and inadequate caloric intake
-nutritional and physiological stress increase the incidence
What ewes usually get pregnancy toxemia?
Ewes with >1 fetus
-affected ewes often in very good body condition
When does pregnancy toxemia occur in ewes and does?
Final 2-4 weeks gestation
What are the clinical signs of pregnancy toxemia?
-Anorexia, weakness, and depression
-Separation from the herd
-Apparent blindness
-Tremors, star gazing, ataxia, circling and bruxism
What is the pathophysiology of pregnancy toxemia?
Inability to meet energy demands w/ rapid fetal growth and inadequate caloric intake
-nutritional and physiological stress increase the incidence
What are the differential diagnoses for a blind small ruminant that is walking around that is not pregnant?
-Thiaminase
-Sulfur toxicity
-Listeria
-lead toxicity
-salt toxicity
What ewes usually get pregnancy toxemia?
Ewes with >1 fetus
-affected ewes often in very good body condition
What are the clinical signs of pregnancy toxemia?
-Anorexia, weakness, and depression
-Separation from the herd
-Apparent blindness
-Tremors, star gazing, ataxia, circling and bruxism
What are the differential diagnoses for a blind small ruminant that is walking around that is not pregnant?
-Thiaminase
-Sulfur toxicity
-Listeria
-lead toxicity
-salt toxicity
What do you find on physical exam and lab findings of an animal with pregnancy toxemia?
-Ketonuria
-acidosis w/ low serum K+ and calcium
-elevated FFA and BHB
-Does may develop marked neutrophilia (stress?)
What do you find on necropsy of an animal with pregnancy toxemia?
Friable and fatty liver
What is the mortality of pregnancy toxemia?
High without aggressive therapy
-economic question of mom or fetus
What is the treatment of pregnancy toxemia?
1) C-section or induce parturition
-Dexamethason in ewes
2) Continuous infusion of glucose
3) Adjunct therapies
-B vitamins for gluconeogenesis, transfaunation
-Glucose precursors: propylene glycol, calcium propionate
What are 3 components of preventing pregnancy toxemia in does and ewes?
1) Predisposed if they enter 3rd trimester over or under-conditioned
2) Provide excellent quality forage
3) Serial measurement of plasma BHB to assess nutritional adequacy
What large animals most commonly get hyperlipemia/ hyperlipidemia?
Ponies, donkeys and miniature horses
What is hyperlipemia/ hyperlipidemia associated with? What animals are predisposed?
A sudden drop in dietary carbohydrates
-sudden starvation or anorexia
-Lactating animals predisposed
-fat mobilization w/ hepatic accumulation
What causes hyperlipemia/ hyperlipidemia?
Production of an abnormal VLDL
Why are horses predisposed to hyperlipidemia/ hyperlipemia?
Make huge lipoproteins (package into giant fat molecules) and they get stuck in capillaries like in the feet, liver and kidney
What is hyperlipidemia?
Mild metabolic dysfunction with mild elevation of triglycerides
<500 mg/dL and plasma is clear
-no evidence of hepatic dysfunction
What is the treatment for hyperlipidemia?
Usually readily reversible if caloric intake increased
Why does hyperlipidemia often occur when animals are azotemic?
Prevents lipid removal from the blood by inhibiting LPL
What is hyperlipemia?
More severe dysfunction
Triglycerides>>>500 mg/dL
What are the clinical signs of hyperlipemia? (3)
1) Anorexia, depression, weakness, incoordination and diarhea
2) White coating of tongue and concurrent myopathy common
3) Insulin resistant hyperglycemia
What is the mortality of hyperlipidemia?
often high
*Why is laminitis a frequent complication of hyperlipemia/ hyperlipidemia?
Giant fat molecules can get stuck in the feet --> laminitis
What are 4 sequela to hyperlipemia/ hyperlipidemia syndromes?
1) Severe metabolic dysfunction and death
2) Liver rupture
-hemoabdomen and sudden death
3) Laminitis a frequent complication
4) Lipid can accumulate in liver, kidney, heart and skeletal muscle and cause signs associated with dysfunction of these organs
What are 6 components to diagnosing hyperlipemia/ hyperlipidemia?
1) History
2) Triglycerides
3) White or yellow opalescence of plasma
4) elevated bilirubin and FFA's
5) Metabolic acidosis in severe cases
6) Ultrasound
-hepatomegaly
-increased echogenicity
-some loss of normal hepatic architecture
What are 3 components to treating hyperlipemia/ hyperlipidemia?
1) Correct primary disease to alleviate anorexia
-teeth?
2) Correct negative energy balance
-IV dextrose infusions
-force feeding alfalfa slurry and/ or complete diets
-intravenous nutrition
3) Insulin reduces fat mobilization