When I was feeding frozen I would not re-freeze any prey items that did not get eaten, they'd go in the garbage.

Here's a little article on refreezing raw meat, this being said don't "cook" your rats!

Quote Originally Posted by Alice Henneman, MS, RD, UNL Extension in Lancaster County

Is It Safe to Refreeze Raw Meat and Poultry that Has Thawed?

The U. S. Dept. of Agriculture (USDA) advises, "Once food is thawed in the refrigerator, it is safe to refreeze it without cooking, although there may be a loss of quality due to the moisture lost through thawing. After cooking raw foods which were previously frozen, it is safe to freeze the cooked foods. If previously cooked foods are thawed in the refrigerator, you may refreeze the unused portion. Freeze leftovers within 3-4 days. Do not refreeze any foods left outside the refrigerator longer than 2 hours; 1 hour in temperatures above 90 °F.

DO NOT thaw meat at room temperature, such as on the kitchen counter.
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When I was feeding frozen I would never refreeze any prey items that did not get eaten, they'd go in the garbage.

Here's a little article on refreezing raw meat, this being said don't "cook" your rats!

Quote Originally Posted by Alice Henneman, MS, RD, UNL Extension in Lancaster County

Is It Safe to Refreeze Raw Meat and Poultry that Has Thawed?

The U. S. Dept. of Agriculture (USDA) advises, "Once food is thawed in the refrigerator, it is safe to refreeze it without cooking, although there may be a loss of quality due to the moisture lost through thawing. After cooking raw foods which were previously frozen, it is safe to freeze the cooked foods. If previously cooked foods are thawed in the refrigerator, you may refreeze the unused portion. Freeze leftovers within 3-4 days. Do not refreeze any foods left outside the refrigerator longer than 2 hours; 1 hour in temperatures above 90 °F.

DO NOT thaw meat at room temperature, such as on the kitchen counter.