FeedManufacturing.com: Animal Feed, Feed Ingredients & Feedstuffs
Meat meal is only available where offal is not valued for human food; may be contaminated and spoiled before use; may also contain animals condemned as unfit for human consumption.
Meat scraps and trimmings after fat removed are dried into meat meal. This is inferior to fish meal or soybean meal and is prone to damage (evidenced by low available lysine) by poor processing. If refrigeration is available or the waste can be collected daily both it and blood are potential moist feed ingredients.