Fish meal is high in essential amino acids and B-vitamins. Because of its high lysine content and low availability, the price is usually high. Excess oil in fish meal can lead to rancidity, and inadequate drying may allow molding. Compared to corn gluten meal, the value of brewers grains is slightly lower due to its higher fiber content. Brewers grains is high in methionine and low in lysine, but does not need to be fed in conjunction with a high quality protein source.
Brewers grains is the most palatable of the high bypass protein sources.
Distillers grains contains the bypass protein fraction while the solubles contain the rapidly degraded protein fraction. Unfortunately the solubles are dried back on the grains in most cases, resulting in a lower bypass protein feed. As with corn gluten meal, distillers grains without solubles may benefit from being fed in conjunction with a high quality protein source. The amount of bypass protein in dehydrated alfalfa-20 depends on the amount of heat applied in dehydration. In order to make a high bypass, dehydrated alfalfa product, alfalfa must be cut and hauled directly to the dehydrating plant.