Types of Proteins in Ruminant Diet


Hello, i am Dr. Kashif Amin and today we will discuss about Types of Proteins in Ruminant Diet. Ruminants have complex stomach consists of reticolum, rumen, omasum and abomasum. So use of proteins and types of proteins are different for them. Lets begin;

What are Proteins?

Proteins are derived from Greek word proteios means Prime importance. Proteins are chains of polypeptides and having well defined three dimensional structure. Mr. Gerard Johann Mulder use this term in 1838 for the first time.

Types of Proteins in Ruminant Diet

Types of Proteins in Ruminant Diet

Proteins are simple as well as complex molecules. simple proteins includes, Albumins, histones, protamins, prolamins, globins, globolins and albuminoids. Complex includes Glycoproteins and phosphoproteins. Phosphoproteins are sweetest of all Proteins.

Types of proteins in Ruminant Diet

Dietary protein – contains amino acids

  1. Rumen Degradable Protein (RDP) – This protein directly used in rumen by microbes. microbes convert RDP to ammonia and amino acids.
  2. Rumen Undegradable Protein (RUP) – This protein bypass the rumen and available in small intestine. fermentation does not occur in small intestine. Varies with diet, feed processing.

Dietary non-protein nitrogen (NPN) – not true protein

This protein is the source of direct nitrogen to rumen microbes, rumen microbes convert it into ammonia and this ammonia is utilized by microbes to produce microbial proteins. Npn are  Relatively cheap and  decreases the cost of protein supplementation.

Ruminants can exist with limited dietary protein sources due to microbes in rumen can synthesize the microbial proteins. Microbial protein is not sufficient during high growth and high production of milk in ruminants. Biological value of microbial protein is less merely up-to 70% and deficient in essential amino acids.


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