1. bookVolume 32 (2014): Issue 1 (December 2014)
Journal Details
License
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Journal
First Published
30 Aug 2012
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2 times per year
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English
access type Open Access

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

Published Online: 30 Dec 2014
Page range: 36 - 40
Journal Details
License
Format
Journal
First Published
30 Aug 2012
Publication timeframe
2 times per year
Languages
English

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

Keywords

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