Definition

Degradable protein is the same as fermentable protein; it’s the fraction that is potentially degradable in the rumen. Total crude protein in a ration consists of soluble protein, degradable protein and rumen ungradable protein. 

Importance

The amount of fermented protein depends on the rate of degradation, ration composition and feed intake. Rumen microbes make use of the fermentable protein to produce microbial protein. The rate at which the fermentable protein is broken down varies by feed material.

Impact of rapidly degradable protein on milk production

Rapidly degradable protein supports milk production, but excess relative to energy (positive RDP) can lead to ammonia buildup. Grass typically contains high levels of degradable protein. Ensiling increases degradation, while drying or adding acids reduces it—often an advantage in many rations.

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