Rats And Mice Flashcards
The taxonomic name for the laboratory mouse is what
(Also known as the house mouse or Swiss albino)
Mus musculus
The taxonomic name for a laboratory rat is what
Rattus norvegicus
The tail of a rat or mouse functions as an organ that does what
Balance and mechanisms for heat loss
Rats dissipate heat through what part of their body
Tail and ears
Rats and mice have how many digits on the front and back feet
4 digits on the forelimb and 5 on the hind limbs
Secretions from the harderian gland contain poryohyrin, a red pigmented substance commonly referred to as what
Red tears
What is the term for, Secretions of the harderian gland may in increase when the animal is I’ll or stressed
Chromodacryorrhea
Because rats and mice teeth grow continuously there are considered
Hyposodontic
Rats do not have what organ
The gallbladder
The ____ in the rodent stomach is responsible for the animals inability to vomit
Limiting ridge
Determination of gender can be accomplished how
At birth
Male mice reach sexual maturity by ___ days
50
Female mice reach sexual maturity by __ days
50-60
The gestation period for mice is
19-21 days
What is the gestation period for rats
22 days
Weaning occurs in mice at
11-14 days
Weaning occurs in rats by
3-4 weeks
Mice can have up to how many pups
10-12
Rats can have up to how many pups
6-12
If a pregnant female mouse is exposed to a new male or it’s odor within 4 days of breeding, the existing pregnancy will usually be aborted and the female will return to estrus
The Bruce effect
Stock refers to
The type of rat or mouse that has been randomly bred
Strain refers to
The type of rat or mouse that has been inbred
When 20 or more generation of brother-sister or parent-offspring mating have occurred, the offspring are referred to as
Inbred
Temperature for rats and mice should be maintained at __ to __ and humidity of __ to __%
65-75
40-60%
A group of rats or mice is called
A mischief
Low humidity predisposes rats to a condition called
Ringtail
True or false
Excess noise may cause cannibalism and drop reproductive rates
True
The eating of feces that is normal behavior for rats and mice is called
Coprophagic
The shelf life of most commercial rodent chow is approximately how long after the milling date
6 months
Aggressive rats usually require the use of ____ when handling
Leather or chain gloves
IV injections can be given where
Saphenous, jugular, femoral, or lateral tail veins
IM injections can be given where
Quadriceps, gluteals, and triceps
IP injections can be given where
Lower left quadrant of the abdomen
What is the appropriate sized needle to use for the collection of blood from the lateral tail vein of a rat.
22 gauge or smaller needle or a butterfly catheter
The causative agent is Gram negative, spore forming, flagellated bacterium clostridium piliforme. The organism is transmitted through fecal-oral route and some clinical signs can be diarrhea or anorexia
Tyzzers disease
A chronic bacterial infection. The causative agent is mycoplasma pulmonis . Affected animals may demonstrate a head tilt, sneezing, snuffling, rakes, and dyspnea
Marine respiratory mycoplasmosis
May be fatal to immunocompromised mice or rats. Some clinical signs can be upper respiratory infections or pneumonia. Abscesses may occur in skin, lymph nodes, uterus, and urinary system
Pasteurellosis
Young rats are particularly susceptible and this harbors bacterium in the upper respiratory tract and the infection can occur when under stress.
Streptococcis
Normal HR for a rat is
313-493BPM
Normal HR for a mouse is
247-697BPM
Normal RR for a mouse is
91-216 BPM
Normal RR for a rat is
71-146 BPM
Alopecia around head and muzzle or truck from cage mates chewing
Barbering
Common in rats that have been kept in low humidity. Causes annular constrictions in tail, leads to sloughing, edema, necrosis. Shoebox type cages help keep humidity up.
Ringtail
Caused by continuous growth if incisors
Malocclusion
