He decided to test his theory on pregnant rats.

However, administration of 16.783 ml/kg day to pregnant rats lowered body weight in male and female offspring.

Also no differences in distribution of the compound in normal and pregnant rats were found.

Eighteen pregnant white rats were used for studies of the effects of microgravity and radiation.

Administration of benznidazole, a chemotherapeutic agent against Chagas disease, to pregnant rats.

It was a huge, sleek fat female rat, already pregnant by the looks of things.

Effects of ergothioneine on diabetic embryopathy in pregnant rats.

Some research has shown that ingestion of the placenta can increase the pain threshold in pregnant rats.

It's easy to control the amount of alcohol you give a pregnant rat.

Tirofiban has been demonstrated to cross the placenta in pregnant rats and rabbits.