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Regarding anesthesia and analgesia according to the AWA
- Procedures involving animals will avoid or minimize discomfort, distress and pain
- Painful procedures will be performed with appropriate sedatives, analgesic or anesthetics
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NIH guideline to anesthesia and analgesia
An integral component of veterinary medical care is the prevention or alleviation of pain associated with procedural and surgical procedures
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A reversible state characterized by the loss of sensation or feeling
Anesthesia
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loss of feeling or sensation in one part of the body
Local Anesthesia
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a state of unconsciousness with absence of pain sensation over the entire body
general anesthesia
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loss of sensation in an anatomical area supplied by a particular nerve (epidural)
Regional anesthesia
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This is referred to as the decreased perception of pain without the loss of consciousness
analgesia
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This is the state of calmness without the loss of consciousness
sedation/tranquilization
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This is the localized sensation of discomfort resulting from the stimulation of specialized nerve endings
Pain
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Criteria for anesthetic method selection: (SAWTHOP)
- Species
- Age
- Weight
- Type of procedure to be done
- Health
- Objectives of the research protocol
- Previous drug administration
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3 steps to pre-operative care
- Acclimate animal (5-7 days)
- Physical exam (tpr), bloodwork
- Fasting dependent upon species
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2 parasympatholytic agents in pre-anethesia
Atropine (except in rabbit) and glycopyrrolate
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parasympatholytic functions for pre-anesthesia
reduce secretions and intestinal motility
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When should pre-anesthetic parasympatholytic agents be given?
30-45 minutes prior to anethesia
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3 tranqulizers/sedatives used in pre-anethesia
- Valium
- Acepromazine maleate
- Xylazine
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Purpose of tranquilizers/sedative in pre-anesthesia
- minimize stress of being restrained
- reduces the amount of general anesthetic agent needed
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2 inhalation methods
- open drop method
- calibrated vaporizer
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3 topical local/regional agents
- cetacaine
- proparacaine
- lidocaine
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2 injectable local/regional agents
- lidocaine
- bupivicaine (marcaine)
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What is the difference between local and regional anesthesia?
- local is infiltration of the agent at the site
- regional is infiltration of the agent around the nerve or spinal cord segment supplying the area
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2 Injectable General Anesthetic agents
- Ketamine - dissociative used with other agents
- Pentobarbital - barbiturate that depresses the CNS
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2 Inhalant Anesthetic agents
- Isofluorane - quick induction/recovery, poor analgesia and muscle relaxation
- Nitrous oxide - gas at room temp, not capable of anesthesia by itself, good analgesia and muscle relation
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4 ways of Monitoring Analgesia
- reflexes
- jaw tone (except rabbits)
- heart rate
- respiration
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2 ways of Monitoring Anesthesia: Heart
- rate and rhythm
- support with adequate fluids and correct anesthetic dose
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3 ways of Monitoring Anesthesia: Respiration
- rate and depth
- Ensure proper positioning
- Periodic or continuous assisted ventilation (longer procedures)
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2 ways of Monitoring Anesthesia: Body Temperature
- rectally or esophageal
- Support with external heat, warm fluids and coverings to minimize heat loss
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2 ways of Monitoring Anesthesia: Fluid status
- Fluid loss monitored by MM/CRT
- Support loss by replacing - 3x volume lost: hetastarch, whole blood, plasma
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4 Facial Grimace: Rodents
- Eyes squinted
- Ears rotated outward
- Cheek muscles contracted
- Whiskers on end
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5 Acute signs of pain:
- Increase heart rate
- abnormal respiration
- vocalization
- muscle tensing (splinting)
- facial grimace
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7 Chronic signs of pain
- any of the acute signs plus:
- reluctance to be handled
- not eating/drinking - weight loss
- glazed eyes
- hyperthermia
- grating of teeth
- guarding
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What are the agents of choice for post-operative pain?
narcotics
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Agents used to control pain due to disease state or mild procedures:
non-narcotics
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Drugs that minimize pain locally/regionally
lidocaine and bupivicaine
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Transdermal drug that minimizes pain systemically:
Fentanyl
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Injectable drugs that minimize pain systemically:
butorphanol, buprenorphine, morphine, meloxicam, carprofen, ketoprofin
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4 Oral drugs that minimize pain systemically:
aspirin, ibuprofen, carprofen, meloxicam
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5 Non-drug methods that minimize pain:
- Positioning
- Bandaging
- Caging
- Acclimating (to cage before surgery)
- Warm environment
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This is the physical environment of the secondary enclosure (room, bar, outdoor habitat)
Macroenvironment
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This is the immediate physical environment surrounding the animal (cage, pen, stall)
Microenvironment
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This type of facility is where the animal housing and use is not the sole use of space or is physically separated from support areas. (favorite of researchers)
decentralized
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This type of facility is where the support, care and use areas are adjacent to the animal housing.
Centralized
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5 advantages of a centralized facility?
- cheaper
- efficient flow
- less duplication
- less transport
- greater biosecurity and security
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Why is recycled air not recommended by the "Guide"?
There is a potential to spread aerosolized contagions
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What is the humidity recommendation of the "Guide"?
30-70%
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What is the air exchange rate recommended by the "Guide"?
10-15/hour in the animal rooms
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these types of cages have force filtered air which decreases ammonia build up
ventilated microenvironments
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These types of cages are usually filtered but have no forced air
static microenvironments
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What does HVAC stand for?
Heat Ventilation Air Conditioning
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What does GFCI stand for and where is it used?
Ground Fault Circuit Interrupter and it is used in aquatic holding facilities
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4 Requirements for Aquatic holding facilities:
- Drains
- All surfaces impervious to water
- Slip-resistant floors
- Material should be moisture and corrosion resistant and non-toxic
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This refers to a surgery that penetrates or exposes a body cavity or produces substantial impairment of physical or physiologic function
Major
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This refers to a surgery that does not expose a body cavity and cause little or no physical impairment.
minor
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This refers to a surgery that the animal is expected to recover.
Survival surgery
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This refers to a surgery where the animal is euthanized once the procedure is performed.
Non-survival surgery
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What are the 2 main differences between rodent and non-rodent surgical guidelines?
- Non-rodent surgery requires the use of a gown/mask/cap/shoe covers
- Non-rodent surgery must be set aside in a separate facility with no other activity
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What are the 3 important advantages of a centralized vs. a non-centralized large animal surgical facility?
- Cost saving on equipment
- Conservation of space, personnel and resources
- Enhanced professional oversight
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6 Large animal facility must haves:
- Construction in materials impervious to moisture and easily sanitized
- Scavenging System
- Centralized storage and supplies
- Autoclave and scrub sinks located near OR
- OR and pre-op adjacent to OR
- Post-Op recovery area
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4 parts Surgery: Veterinarian Role
- member of IACUC
- indepth knowledge of research protocols
- work closely with researcher re: protocols/refinement
- provide support to the veterinary technician
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4 parts Surgery: Veterinary Technician Role:
- provide anesthesia - support and monitoring
- provide non-sterile surgery support
- compliance monitoring
- surgical facility maintenance
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4 parts Veterinary Technician Clinical Role:
- Post-operative management
- Health rounds, patient records management and treatments
- Sample collection and subsequent labwork
- Manage preventative health programs
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3 parts Surgery: Research Staff Role:
- Research related manipulations
- Collection of research data
- progress reports (necessary for protocol renewal)
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3 parts Husbandry staff role:
- Provides food,water, clean cage environments
- First line of defense for animal welfare - most familiar with the animals in their care
- Have a more frequent presence in the facility
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3 general forms of record keeping:
- Anesthetic records
- Controlled drug logs
- Quality control logs
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How often are vaporizers certified?
annually
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How are autoclaves and sterilizers maintained?
Quality control through ampules on quarterly basis
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Compliance monitoring ensures 4 things:
- sterile techniques are followed
- proper training of employess
- manipulations are performed to approved protocols
- quality control measures are followed
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Amyloidosis is associated with which infrequently used research animal?
White peking ducks
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Atherosclerosis is associated with which 3 infrequently used research animal(s)
- Homing and Racer pigeons - some breeds are susceptible and others are resistant
- Japanese quail
- Collared Lemming
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Slender louse of pigeons
Columbicola columbae
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Turkeys are occasionally used in what 2 types of research
- cardiomyopathy with endocardial febroelastosis
- Hereditary muscular dystrophy
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The White leghorn chicken is occasionally used in what 4 types of research?
- Hereditary Muscular Dystrophy
- Hashimoto thyroiditis
- Gout
- Delayed neurotoxicity
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Which animal has scent glands ventral to each eye?
Blue Duikker (miniature S. African antelope)
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Which animal has naturally occurring sickle-shaped RBCs?
Genet
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Which animal is used in vertical transmission of rabies and canine distemper research?
Striped Skunk
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Which animal has non-retractable claws and is an induced ovulator?
New World Mink
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What research is the New World Mink used for?
Kuru, Creutzfeldt-Jacob disease
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Which animal is used for research on Lepromatous leprosy?
nine banded armadillo
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What is special about the nine banded armadillo's offspring?
Regular production of 4-8 monozygotic offspring (identical)
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Which animal has footpads that can be formed into vacuum cups for climbing?
Rock Hyraz
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What is the Rock Hyraz used for in research?
- reproductive physiology, endocrinology (abdominal testes)
- naturally occurring gastric ulcers
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Which animal was banned by the USDA due to it harboring avian and bovine tuberculosis?
Brush Tail Possum
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In which animal is muscular dystrophy reversible by vitamin supplementation?
Short Tailed Wallaby
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Which animal is used in carcinogenesis in embryonic mammalian systems research
Mouse Opossum
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Why is it important not to dislodge mouse opossum from the circular mammar?
Since they have no pouch, the young cling to a circle of teat on the abdomen. If dislodge they cannot reattach and will die
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What is the only north american marsupial?
Opossom (Didelphis virginana)
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How many teeth does an opossum have?
52 the most of any animal
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Why is the opossum used in immunological studies?
born without any lymphocytes
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What 3 etiologies are opossums naturally resistant to:
rabies, snake venom, mycobacterium sp.
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What etiologies are opossum naturally affected with?
Leptospira spp, Borreila recurrentis Streptococcus viridians adn pyogenes, salmonellosis and tularemia
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Why is the opossum used in esophageal burn research?
musculature resembles humans
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What animal requires sand baths
Kangaroo rat
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Which family has 5 genera that all are nocturnal and have external fur-lined cheek pouches
Heteromyidae
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Which animal is used in research of hibernation and hepatomas induced by viral hepatitis?
Wood Chuck/Ground Hog/Marmot
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Which animal is used in research of gallstones associated with high cholesterol diets?
Prairie dog
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What social hierarchy do prairie dogs live in?
towns
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Which animal is used in research of Leshmaniasis and has separate thymus glands in cervical and mediastinal areas?
Degu (Octodon degu) Trumpet-tailed Rat
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What animal does not have a vaginal closure membrane?
Nutria
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Chinchilla gestation:
111 days
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Why is the chinchilla used in hearing research?
They do not experience aging deafness
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What is the only mammal that live eusocially?
naked mole rat
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What is a eusocial colony?
1 dominant queen and 1- 2 breeding males with 100-300 closely related sterile underlings
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What happens when the dominant female naked mole rat is removed?
The succeeding female's testosterone increases sharply.
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What does the naked mole rat use for digging?
procumbent incisors
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What is the only muridae that can eat solid food at birth
Egyptian Spiny mouse
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What animal is used in Rift Valley Fever research?
Niles Grass Rat
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What animal is the only animal model for antral adenocarcinoma research?
Multimammuate mouse
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Which 3 infrequently used research animals form monogamous pairs?
- Multimammuate mouse
- Grasshopper mouse
- Deer mouse
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Which is the newest animal used as a model for Hantaan Virus?
Striped Field Mouse
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Which 2 animals are susceptible to ringtail?
- African White-tailed Rat
- Cotton Rat
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Which animals diving reflex is not inhibited by anesthesia?
Muskrat
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What animal's shrill alarm sounds like a "mini wolf"
Grasshopper mouse
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What animal is used in periodontitis research due to its immediate response to a high sucrose diet by forming dental caries?
Rice Rat
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What 4 research is the Deer mouse used in?
- Hantaan virus - natural reservoir
- Trypansomiasis in humans
- Mouse Hepatitis - resistant
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What is NIDR?
Naval Institute of Dental Research
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What research is the African White-tailed rat used in?
spontaneous diabetes mellitus without obesity
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What animal is the natural host for Brucella neotomae?
Wood Rat
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Which animal has an ear valve that regulates the size of the opening?
Wood Lemming
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Which act governs Infrequent Lab animals and why?
They are governed by the Animal Welfare Act because they are considered "wild" animals.
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Which animal is naturally free from most common latent murine diseases?
Vesper mouse
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What area of research is the Vesper mouse used?
Bolivian Hemorrhagic Fever - Machupovirus
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Which animal is the only seasonally color changing rodent?
Collared Lemming
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What is the steppe lemming used for?
control in pox studies - naturally resistant to ectromelia
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What disease is the Collared Lemming highly susceptible to?
Brucella suis
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Rabbits/Hares
Order:
Family:
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Rabbit facts:
- 1)social animals
- 2)dig burrows
- 3)make nest lined with fur
- 4)altricial young
- 5)susceptible to myxomatosis
- 6)warrens
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Hare facts:
- 1) usually solitary
- 2)do not dig burrows
- 3) rest in depressions called a form
- 4) precocious young
- 5) generally larger than rabbits
- 6) not susceptible to myxomatosis
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What is myxomatosis characterized by?
Horn like growths
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4 advantages of rabbits use in research
- 1) good antibody producers
- 2) large body of research already done on rabbits
- 3) large enough for some major surgical procedures
- 4) some genetically unique strains available
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4 disadvantages of rabbit use in research
- 1) variable response to anethesia
- 2) more prone to cardiovascular failure
- 3) prone to stress disease like coccidiosis
- 4) susceptible to Pasteurella which reduces gaseous exchange
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What parasympatholytic agent are rabbits resistant to?
atropine
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Rabbit life span
5-10 years
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Rabbit commercial life span
2-3 years
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Laboratory rabbit life span
few days to several years
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5 traits of Rabbit disposition and behavior
- 1) alert and docile - adapt well to cages
- 2) frightened animals kick, scream, jump
- 3) occasionally get attack rabbits
- 4) play with toys, water bottle, feeders, lickers
- 5) males spray urine and will fight with other males
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What type of incisors to rabbits have?
hipsodontic
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Rabbit Dental formula:
I2/1, C0/0, P3/2, m3/3
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Rabbit temperature:
99.1 - 103 F
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Rabbit Heart rate
250 - 300 bpm (@180bpm under anesthesia)
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2 Rabbit Digestion
- 1) herbivorous
- 2) extensive cecum to accommodate fermentative digestion
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Rabbit activity
crepuscular - active at dust and dawn
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Rabbit Feces
- hard, dark round balls
- coprophagy of special pellets produced at dawn: softer/mucus covered - ingested to reinoculate gut with beneficial bacteria
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Rabbit estrus length
2-4 week period - red vulva
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Rabbit puberty
5-9 months
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Rabbit Estrous cycle
- polyestrous - at any given time a follicle can develop
- Ovulation is induced
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Rabbit act of parturition
- prior to kindling doe will build nest and line by pulling her fur
- kindling
- can be split up to 3 days apart (a function related to hiding from predators)
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Difference in appearance of male and female
- Females - dulap
- Males - head is big relative to body
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Rabbit Urine
- normally creamy yellow - due to calcium crystals
- pH = 8.2
- moderate proteinuria is normal
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Estrus doe behavior
hops around and rubs chin on cage
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Rabbit Copulation
- 1) take doe to buck's cage
- 2) copulation is very quick @ 30 sec
- 3) buck will scream and fall backward when done
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Rabbit gestation
30-32 days (45 days in hares)
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When do you palpate for pregnancy in a rabbit?
10-14 days after breeding
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Baby rabbits are called:
Baby hares are called:
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