I believe "vez" is a typo for "ver"

uwnews.org | University of Washington News and Information
Overfeeding normal infant rats affects three generations: Overfeeding normal ... Now a new study of genetically normal rats indicates that the effect of ...
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Fear of novelty in infant rats predicts adult corticosterone ...
Second, we were able to detect behavioral differences among infant rats within a family, and this behavioral disposition at infancy predicted the magnitude ...
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Ultrasound emission in infant rats as an indicant of arousal ...
Infant rats rewarded for crawling by being allowed to suckle on the dry ... These results suggest that infant rats can be stressed and are aroused as a ...
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Brain angiotensinergic mediation of enhanced water consumption in ...
The mechanism by which lactating rats increase fluid consumption to meet the demands of milk production is unknown. Because ANG II is the most potent ...
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Metabolic mapping of the brain in pregnant, parturient and ...
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Control of fluid intake in pregnant and lactating rats.
Lactating rats showed a reduced absolute and net fluid intake in response to I.V. ... The pregnant and lactating rats drank less in response to s.c. ...
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Amino acid metabolism and protein synthesis in lactating rats fed ...
Amino acid metabolism was studied in control virgin rats, lactating rats and virgin rats protein-pair-fed with the lactating rats (high-protein virgin rats) ...
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Note added at 44 mins (2006-11-07 09:03:01 GMT)
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baby rats is also acceptable:

the Rat Report
Until their fur grows in, baby rats can’t regulate their own temperature. The best place to keep an orphaned rat is in a small box on a piece of felt large ...
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the Rat Report
Rats are very easy to breed. In fact, many people end up with unplanned baby rats! Rats can reach sexual maturity at 5 weeks of age, so the sexes should be ...
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Hi Adam,

It is difficult to know what "exposición" refers to without further context - what are they doing to these rats? Exposing them to something? Giving them drugs?

I don't think "vez" is a typo - I think it just means that the rats are used at the same time.

Baby rats are usually referred to as "kittens".

Good luck!