Ruminal ammonia formation in relation to the utilization of groundnut meal and herring meal as protein sources for milk production

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Abstract
1. Groundnut meal and herring meal have been compared as protein sources for ruminants. 2. Herring meal caused less extensive formation of ammonia in the rumen than did groundnut meal. 3. Nitrogen-balance experiments showed that herring meal fed to lactating goats was used more efficiently than groundnut meal fed under the same dietary conditions. 4. Herring meal was superior to groundnut meal for milk production in dairy cows.