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A lot of breeders don’t understand the caloric requirements of a nursing mom. During the last trimester of pregnancy, her caloric needs are two to three times her normal caloric needs. During nursing her caloric needs can be as much as six times her normal caloric needs, depending on her litter size and metabolism. This will get a little math-y and just a little technical. I think it’s better if we can understand a little of the why before we learn the how.