Methods to improve the fraction of nondegradable protein in the rumen: A review

Objective: To investigate methods to reduce dietary protein degradability at the ruminal level and to analyze their effects on ruminal fermentation based on the analysis of available literature. Design/methodology/approach: The protection of dietary protein leads to a lower degradation at the ruminal level and an increase in the supply and utilization of amino acids. Limitations of the study/implications: The efficacy of the processing method depends on the ingredients used in the diet. Conclusions: The use of physical, chemical, or combination treatments is justified on raw materials with high protein value and degradability; these efficiently protect the protein from ruminal degradation and provide a better supply to the small intestine.