animal protein factor
noun
: vitamin B12 or a concentrate containing this vitamin and usually antibiotics that is obtained especially in the fermentation production of vitamin B12 and chlortetracycline and is used as a supplement in some animal and poultry feeds
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“Animal protein factor.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/animal%20protein%20factor. Accessed 31 Oct. 2025.
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