<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Milk composition is of prime economic importance for farmers. Milk total proteins are composed of casein, whey proteins and non-protein nitrogen. The objective of this work was to establish milk crude protein, non-protein nitrogen (NPN) and urea content in dairy cow milk produced in different farms in Latvia. Cow milk samples (n=30) were collected in September 2012 from four different farms breeding diverse cow breeds. Average crude protein, casein and urea content in milk varied significantly among farms. NPN content in cow milk varies among farms - from 0.194% to 0.232%. Average crude protein and casein content was significantly higher (p&lt;0.05) for Latvia Brown breed cows, while NPN content did not differ significantly among breeds. Regression between NPN and urea content in milk was R² = 0.458. Correlation between NPN and urea content was significant (r = 0.677). This study allowed establishing that crude protein and NPN content in milk varied significantly (p&lt;0.05) in farms with differing dairy cow housing and feeding technologies</p></abstract>

Milk composition is of prime economic importance for farmers. Milk total proteins are composed of casein, whey proteins and non-protein nitrogen. The objective of this work was to establish milk crude protein, non-protein nitrogen (NPN) and urea content in dairy cow milk produced in different farms in Latvia. Cow milk samples (n=30) were collected in September 2012 from four different farms breeding diverse cow breeds. Average crude protein, casein and urea content in milk varied significantly among farms. NPN content in cow milk varies among farms - from 0.194% to 0.232%. Average crude protein and casein content was significantly higher (p<0.05) for Latvia Brown breed cows, while NPN content did not differ significantly among breeds. Regression between NPN and urea content in milk was R² = 0.458. Correlation between NPN and urea content was significant (r = 0.677). This study allowed establishing that crude protein and NPN content in milk varied significantly (p<0.05) in farms with differing dairy cow housing and feeding technologies

Crude Protein and Non-protein Nitrogen Content in Dairy Cow Milk

Institute of Agrobiotechnology, Latvia University of Agriculture, Liela str. 2, Jelgava, LV 3001, Latvia

Rural Sustainability Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Crude Protein and Non-protein Nitrogen Content in Dairy Cow Milk"}

Milk composition is of prime economic importance for farmers. Milk total proteins are composed of casein, whey proteins and non-protein nitrogen. The objective...

Crude Protein and Non-protein Nitrogen Content in Dairy Cow Milk

Published Online: Dec 30, 2014

Page range: 36 - 40

DOI: https://doi.org/10.2478/plua-2014-0011

© by Diana Ruska

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.