Give an example of a protein source in feedstuffs.

Give an example of a protein source in feedstuffs.

• A. Animal or plant proteins, legume seeds, or non-protein nitrogen (NPN).
• B. Pure water.
• C. Salt blocks.
• D. Inert fillers like sand.

Answer: (A)

Protein in feeds comes from actual protein-containing ingredients, which can be of animal or plant origin. Legume seeds are a classic example of plant-based protein sources used in livestock feeds because they’re rich in amino acids. Non-protein nitrogen is not a protein itself, but in ruminants it can be used by rumen microbes to synthesize microbial protein, helping meet the animal’s amino acid needs indirectly. That combination in one statement reflects the kinds of inputs that contribute to a feed’s protein value, making it the best choice for an example of a protein source in feedstuffs. Pure water, salt blocks, and inert fillers like sand do not supply protein or usable nitrogen for protein synthesis, so they aren’t protein sources.

Protein in feeds comes from actual protein-containing ingredients, which can be of animal or plant origin. Legume seeds are a classic example of plant-based protein sources used in livestock feeds because they’re rich in amino acids. Non-protein nitrogen is not a protein itself, but in ruminants it can be used by rumen microbes to synthesize microbial protein, helping meet the animal’s amino acid needs indirectly. That combination in one statement reflects the kinds of inputs that contribute to a feed’s protein value, making it the best choice for an example of a protein source in feedstuffs.

Pure water, salt blocks, and inert fillers like sand do not supply protein or usable nitrogen for protein synthesis, so they aren’t protein sources.