Digestible Protein (DCP) the amount of crude protein (CP) actually absorbed by the animal (crude protein minus the protein lost in faeces).
Additional protein beyond that supplied by the rumen microbes is provided in the form of undegradable protein (UIP). Non-protein nitrogen (NPN) can be used to meet some of the crude protein needs. NPN is first converted to ammonia in the rumen and then used by the rumen microbes to make microbial protein. Three protein sources contribute to the amino acid pool available for absorption at the small intestine. First of all, rumen microbes pass down to the intestine. In one study where researchers isolated rumen bacteria, crude protein as a percentage of bacterial dry matter ranged from 39 to 56%. Also a balance of RDP, RUP, and nonfiber carbohydrates is needed. The nonfiber carbohydrates are sugars and starches and supply energy for microbes in the rumen. They complement the RDP, which must be converted to microbial protein to be used by the cow. Below is an indication of how the 2001 NRC model predicts utilization of the RDP and RUP in cows producing 77 lbs. of milk per day. Adequate energy is needed in the rumen for efficient nitrogen utilization to occur. This energy mainly comes from sugars and starches plus some from fiber digestion. Of the RUP, 85% is absorbed. This emphasizes why RUP is important for efficient protein utilization. Metabolizable protein is the protein that flows from the rumen, is digested, is absorbed from the small intestine as amino acids, and is available to be metabolized by the cow. MP is a combination of undegraded feed protein (UIP or RUP), rumen microbial protein, and endogenous protein. Three protein sources contribute to the amino acid pool available for absorption at the small intestine. First of all, rumen microbes pass down to the intestine. In one study where researchers isolated rumen bacteria, crude protein as a percentage of bacterial dry matter ranged from 39 to 56%. Metabolizable Protein (MP) - metabolizable protein is protein (amino acids) that is actually absorbed from the gut. MP consists of protein in the rumen microorganisms, feed protein and any protein that bypasses digestion in the rumen (undegradable intake protein (UIP). The concept of protein degradability has led to a new protein system called the metabolizable protein (MP) system. The aim of this study was to investigate the effects of supplementation with digestible undegradable protein (DUP) in diet during late pregnancy on colostrum production, lamb survival and growth.  only about half of the dietary protein of ruminants is digested in the rumen; some, e.g. those in maize, or those treated to pass though to the abomasum by heating or the addition of formaldehyde, are readily digestible by intestinal digestion systems.  Undegradable Intake Protein Undegradable Intake Protein (UIP) is defined by the US NRC as thefraction of crude protein (CP) consumed which is not degraded byrumen microbes. UIP is commonly referred to as bypass protein orescape protein.  By-pass Protein-refers to the portion of intake protein in a feed that is not broken down in the rumen but is digested directly in the small intestine. By-pass protein is another name for undegradable intake protein (UIP), rumen undegradable protein (RUP) or escape protein. Acid Detergent Insoluble Nitrogen (ADIN) - a measure of the nitrogen remaining in the acid detergent fibre residue of a feed sample. For example 10 mg/kg = 10 ppm. Escape Protein-see By-pass Protein or Undegradable Intake Protein. Digestible Protein (DCP) - the amount of crude protein (CP) actually absorbed by the animal (crude protein minus the protein lost in faeces). It may also be referred to as degradable intake protein (DIP) Undegradable Intake Protein (UIP) - is also called bypass protein or escaped protein or rumen undegradable protein (RUP) . It is the portion of intake protein that escapes rumen degradation and is digested directly in the small intestine. For example 10 mg/kg = 10 ppm. Escape Protein-see By-pass Protein or Undegradable Intake Protein. Digestible Protein (DCP) - the amount of crude protein (CP) actually absorbed by the animal (crude protein minus the protein lost in faeces).
http://www.milkproduction.com/Library/Scientific-articles/Nutrition/Protein/ http://www.sites.ext.vt.edu/newsletter-archive/dairy/2002-01/rumen.html http://www.milkproduction.com/Library/Scientific-articles/Nutrition/Protein/ http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex4521 http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0396.2010.01092.x/abstract http://medical-dictionary.thefreedictionary.com/rumen-undegradable+proteins http://www.agromedia.ca/ADM_Articles/content/f1a1u1.pdf http://www.agricom.co.nz/assets/files/nz/content_files/Ruminant%20Glossary%20-%20Proteins.pdf http://www.agricom.co.nz/assets/files/nz/content_files/Ruminant%20Glossary%20-%20Proteins.pdf
what is digestible undegradable protein