Chaoter 19: Rats Flashcards
What is the average weight of a typical newborn rat?
5-6 grams
What of these anatomical characteristics distinguished rats from mice? A- a shorter esophagus B- two upper and two lower incisors C- the lack of a gallbladder D- the presence of premolar teeth
C- The lack of a gallbladder
Which rat is albino, has a wide head, long ears, and a tail that is half it’s body length?
Wistar
True or False
Male rats can usually not be housed together, as they will fight.
False
Which of the following are common inbred strains of rats? Fischer 344 Wistar Sprague Dawley Long Evans Lewis BalbC
Fischer 344
Lewis
Which rat stock is also known as the “hooded” rat?
Long-Evans
What problem can occur if you pick rats up by the tip of the tail?
The skin may slough
List two biological features that rats have in common with mice
Cannot vomit
No premolars or canine teeth
The female rat’s estrous cycle lasts about ________ days
4-5
Rats are nocturnal, meaning that they are ________ at night.
Awake
The reddish material found in tears and saliva of rats is called _________
Porphyrin
Rats are fed free choice and water, which is sometimes referred to as __________
Ad libitum
Because rats are social animals, they should be _________-housed.
Group
Cervical dislocation should only be performed on rats weighing less than _________g.
200
True or False
Rats are generally more relaxed and less prone to biting their handlers than are mice
True
What is the scientific name for the common laboratory rat?
Rattus norvegicus
How much food and water does an adult rat usually consume in a day?
5g food
8-11 ml water
Which animal identification procedure sometimes used for rats should only be done on neonates, with IACUC approval?
Toe-clipping
What problem occurs if rats are kept in wire-bottom cages for long periods of time (a year or more)?
Foot lesions
Why is cervical dislocation used less often with rats than with mice?
Rats are larger making it harder
