pt 7 (rat)

Question 1

what is the genus name for rats?

Answer 1

rattus norvegicus

Question 2

name 2 strains of rats used in research?

Answer 2

sprague-dawley
long-evens (hooded)

Question 3

estrus cycle, gestation, weaning age, and whether the young are altricious or precocious

Answer 3

estrus cycle - 5 days
gestation - 21 days
weaning - 21 days
altricious

Question 4

do rats have postpartum heat? what is the consequence of breeding then?

Answer 4

can rebreed but may go into facultative diapause (delayed implantation)

Question 5

what is the vaginal plug made of? compare where you would look for it as opposed to where you would look on a mouse

Answer 5

semen; it falls out quicker so look in the cage

Question 6

why don’t you leave the lights on all the time in the rat room?

Answer 6

constant light produces continuous estrus

Question 7

do rats get ringtail? what causes it?

Answer 7

same as mouse

Question 8

what type of tumor is common in rats? malignant or benign?

Answer 8

mammary tumores; bengin

Question 9

what causes SDAV? is it infectious? 4 symptoms?

Answer 9

virus through direct contact; eye squinting, swelling of ventral neck and jaw, protrusion of eye, keratitis

Question 10

what is chromodacryorrhea? keratitis? what disease are these associated with?

Answer 10

red tears; inflammation of cornea; respiratory disease and SDAV

Question 11

if a cage of rats have SDAV should all the rats be eliminated?

Answer 11

no treatment will help - will end up being eliminated

Question 12

are the parasites and dermatophytes of rats the same as those affecting mice?

Answer 12

yes

Question 13

name 3 respiratory diseases of rats that are also in mice and describe the symptoms

Answer 13

mycoplasma, sendai virus, and PVM; same as mice