Pregnant rats will need extra protein to help sustain her better as she is growing and raising pups. Supplement her with eggs, a little cooked meat, yoghurt or soy milk, etc.
Canned oysters - Canned oysters should be fine and nutritious for your rats (As a treat), but I would recommend steering clear of any other form of oysters.
Mealworms - Perfectly fine for your rat and good source of protein. Fine alive or dead
Meat - Chicken is always best, but they can eat any kind of cooked meat. Try to keep the fat down.
Courtesy of RatForum^^^
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