Exam 1 Flashcards
Why did the cost of chicken rise and consumption drop around 2008?
Economic recession
Avian influenza outbreak
Increased cost of production (corn directed to ethanol)
Drought
What are the feed conversions of beef, pork, chicken?
Beef: 6-1
Pork: 3-1
Chicken: 2-1
Why does infectious coryza persist in chicken farms?
Farms are never totally depopulated
Design of industry has different ages in different barns
How is fowlpox spread? How is it prevented?
Wild birds and mosquitos
Vaccination
What is Marek’s disease and how is it diagnosed?
Herpesvirus-induced disease that transforms lymphocytes and causes tumor formation
Controlled by vaccination
Diagnosed by evaluating thickenss of lumbosacral nerve plexus
Classic picture of dead chicken with one leg forward and one back
What causes cannibalism?
Genetic predisposition
Has to be controlled by management (beak trimming, dec light intensity)
How is avian influenza controlled in US?
Infected birds are eradicated
Vaccination not done in US
Why does infectious bronchitis (poultry) persist in environment despite being very susceptible to disinfectants?
High mutation rate allows virus to persist and thrive in many tissues
What is the pathogenesis of ascites in poultry?
Metabolic disease
Heart and lungs cannot adequately oxygenate muscles-> R sided heart failure
What is heart attack or “flip over” caused by in poultry?
Overexertion
Metabolic disease in fast growing broilers
For poultry vaccination programs, what type of spray is best?
Very fine spray (penetrates deeper)
Which poultry vaccination program is more complex, breeder or layer?
Breeder
Can avian pox affect humans?
No
Where are vaccines for avian pox administered?
Chicken- wing web
Turkeys- thigh
Is poultry coccidiosis zoonotic?
No
What country produces the most fish?
China (89%)
What are the 3 most major components of Florida aquaculture?
Tropical fish
Aquatic plants
Clams
WHat are some advantages of extensive aquaculture?
Feed and aeration of water not required
Ideal for recreational pond
Little/no investment needed for equipment/feed
What is an example of an extensive aquaculture program in Florida?
Livebearer production (guppies, swordtails, platties)
What are some advantages of intensive aquaculture?
If indoors, more control and decreased predation
Increased production
What are some disadvantages of intensive aquaculture?
Increased risk of disease
System failure can lead to catastrophic loss
High start-up and operating costs
Complete diet required
What is an example of intensive aquaculture in Florida?
Angelfish production
What are the most common types of production systems for aquaculture in the US?
Earthen ponds (54%) Raceways (10%) Cages or net pens Re-circulating tank systems Underwater lease
What are the advantages and disadvantages of pond production for aquaculture?
Adantages:
Free or cheap
Filtration not required
Some natural food available
Disadvantages: Minimal control of environment High predation Difficult to maintain inventory "Off flavor"
What are the advantages and disadvantages of raceway aquaculture systems?
Advantage: “free” source of water that filters itself
Disadvantage: unknown source of water, potential contamination, hard to treat
What are the advantages and disadvantages of cage aquaculture?
Advantages: “free” water exchange, easy to harvest
Disadvantages: aesthetic/environmental concerns, exposure to wild fish, contamination, disease, difficult to treat
What are the advantages and disadvantages of re-circulating aquaculture systems?
Advantages: complete control of environment, elimination of predation, efficient, treatment is easier
Disadvantages: very high capital investment, high risk (power failure), intensive management requirements, expensive, biosecurity critical
What is all-in-all-out harvest?
Area is drained and all fish are collected, pond is disinfected
Allows for good control of inventory, avoid build up of organic material, can produce multiple crops in same pond, much better for biosecutiry
What is continuous harvest?
Fish are removed and replaced with younger fish
Advantage: practical for large ponds
Disadvantage: loose track of inventory, massive accumulation of organic matter, major disease control can be difficult
What are two major concerns for channel catfish?
Water quality- Low dissolved oxygen and “Off flavor”
What is important to know about tilapia?
They are thermal limited
Temperature less than 50 F is fatal
What are two health concerns for tilapia?
Streptococcus innae
Francisella
What is the #1 fish produced in china?
Carp
What are special health concerns for carp/koi?
Spring viremia of carp (SVC)- depopulation required
koi herpes virus (KHV)- no action taken
REPORTABLE DISEASES!
What are the basic components of a fish health management program?
Water quality/life support
Nutrition
Sanitation
Quarantine/biosecutiry
What are the most important water quality parameters?
Dissolved oxygen
Total ammonia nitrogen
Unionized ammonia nitrogen (toxic ammonia)
What is a common cause of fish kills following big storms?
Stratification- cold water with low oxygen mixes with warm water
Cold water had high oxygen demand, when water mixes, oxygen is used up -> die off
What are sources of ammonia in aquaculture?
Fish (primary source in aquarium setting) Feed Decomposition of organic matter Uneaten food Heterotrophic bacteria
At what level may there be toxicity due to unionzed ammonia?
0.05 mg/L
How does pH affect ammonia levels?
Higher pH = increased ammonia
What are the effects of increased levels of ammonia in blood (fish)?
Osmoregulation is affected
Blood pH increased
Oxygen demand increased
Oxygen transport decreased
What are the effects of chornic low level ammonia (fish)?
Inhibits growth
Increases susceptibility to disease
What is the #1 aquaculture product in US?
Catfish
What are the regulatory standards for ruminant dairy production?
Higher counts than cow’s milk
Somatic cell count: 1 x 10^6 cells/ml
Standard plate count: 100,000 cells/ml
What is the most economically important part of sheep industry?
Selling lambs
T/F? Worldwide, there are more goats than cattle
True
What are the most popular goat meat breeds in US?
Boer, spanish, and kiko
What are the most common uses for sheep in US?
Meat and wool
What things should you assess on a small ruminant physical exam?
Udder, LNs, feet, legs, fecal consistency, urine, skin, BCS
How do you estimate the age of sheep?
permanent teeth / 2 = age
Worn teeth = over 4 years
Why is water consumption so important for male goats?
Prone to urolithiasis
At what BCS is it ideal for a male goat to enter breeding season?
BCS 3-4/5
What BSC should a female goat be in early gestation?
3-3.5
When do lambs/kids start eating solid feed?
3 weeks
What do you do to avoid rumen acidosis in feedlot situations for small ruminants?
Diet should be >10% roughage
Include rumen buffers in ration
Avoid sudden dietary changes
Feed whole (uncracked) grains
When does toxicity from toxic plants most often occur (sheep/goats)?
Alternative feeds are not available
When very hungry animals are turned out into areas containing toxic plants
When animals are confined in an area containing toxic plants
Toxic shrubs and trees are more of a concern for what animals?
Goats (they are browsers)
What percent of a goats diet is browsing/grazing?
80% from browsing
20% grazing
Re urine acidifiers used for in pet goat feed?
Prevention of urolithiasis in males
When do small ruminants reach puberty?
Generally 5-12 months
When do small ruminants start breeding?
~70% mature size, ideally 7-10 months
What is the gestation length for sheep and goats?
Sheep- 147 days
Goats- 150 days
What type of breeders are small ruminants?
Seasonal polyestrus, short day breeders
What is the Whitten effect?
Induction of cyclicity in small ruminants by abrupt introduction of a male
What are signs of heat in does and ewes?
Does: flagging, vocalizing, mounting
Ewes: subtle, will stand for ram to mate
What do bucks do during breeding season to attract females?
Spray urine
Increased scent gland activity
How do you diagnose pregnancy in ewes and does?
Low serum or milk progesterone >5 days after breeding = not pregnant
Pregnancy-specific protein B (Biopryn) 30 days post breeding
Ultrasound (>45 and /90 days)
When is castration in male sheep/goats done?
4-14 days
Pets- >3 months to prevent obstructive urolithiasis
What are the two techniques for castrating small ruminants?
Elastrator bands (best if done at <1 week old, sloughing in 7-10 days)
Burdizzo emasculatome
Surgical (post-pubertal males)
When is tail docking done for small ruminants?
Common for wool breeds, best 24 hrs- 7 days old
How long should the tail be after you dock it (small ruminants)?
Should cover vulva (ewes) or anus (rams), no shorter than distal end of caudal tail fold
What happens if you dock tail of a small ruminant too short?
Vaginal or rectal prolapse
Why do you have to be careful using lidocaine for local nerve block in disbudding of small ruminants?
Can be toxic if a high dose is given
Dilute if needed- no more than 5mg/kg, 0.5%
What nerves do you need to block for disbudding procedure?
Cornual branch of intratrochlear n.
Cornual branch of lacrimal n.
Males castrated before what age do not develop scent glands?
7.5 months (before puberty)
When should kids be disbudded?
Generally in the first week of life except for breeds like Nubian, Pygmy and Angora kids (10-14 days)