Milk urea nitrogen as a tool to monitor the protein nutrition of dairy cows

Journal of Dairy Science
G HofS Tamminga

Abstract

The relationship between protein nutrition and milk urea N was investigated in three experiments with a total of 125 cows. After 4 wk of pretreatment, cows received 1 of 13 diets with different ratios of protein to energy for 16 wk. Milk was sampled individually for urea analyses during pretreatment and during wk 1, 5, 10, and 15 of treatment. Results were compared with N losses estimated from rumen fermentation and with N losses of metabolic origin. The mean milk urea N concentration was 12.6 mg/100 ml of milk (range, 9.0 to 18.3 mg). For bulk samples especially, the rumen efflux of crude protein intake was the main determinant of the variation in milk urea N (r2 = 0.81; residual SD = 1.1). However, N losses from the rumen explained only about 50% of the variation in the milk urea N content of samples from individual cows. The N losses of metabolic origin, which, in these experiments, were responsible for 47 to 100% of urinary N losses, were not related to milk urea N. Results showed that regular measurement of milk urea N in bulk samples can be used to monitor N losses from rumen fermentation. However, the value does not give an indication of the efficiency with which the absorbed protein is utilized.

References

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Citations

Jan 19, 2016·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
Dec 30, 2017·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
Oct 6, 1999·Journal of Dairy Science·D M JenkinsR H Bondurant
Oct 5, 2002·Journal of Dairy Science·S GoddenM LaValle
Aug 9, 2003·Journal of Dairy Science·G M WoodD F Kelton
Feb 6, 2004·Journal of Dairy Science·J NousiainenP Huhtanen
Jan 18, 2005·Journal of Dairy Science·D HojmanE Ezra
Nov 9, 2001·Journal of Dairy Science·A J Kauffman, N R St-Pierre
Apr 6, 2000·Journal of Dairy Science·P MelendezJ Hernandez
Jul 23, 2008·The Journal of Dairy Research·Rajan SharmaSudhir K Tomar
Sep 10, 2003·Journal of the American Veterinary Medical Association·Pedro MelendezWilliam W Thatcher
Jun 17, 2009·Journal of Dairy Science·C BastinN Gengler
Jun 27, 2020·Journal of Animal Physiology and Animal Nutrition·Evelyne C KesslerJosef J Gross
Mar 10, 2001·Journal of Dairy Science·P J Rajala-SchultzT E Wittum
Feb 13, 2021·Animals : an Open Access Journal From MDPI·Anna Lavery, Conrad P Ferris
Apr 4, 2021·Animals : an Open Access Journal From MDPI·Hewa Bahithige Pavithra Chathurangi AriyarathneNicolas Lopez-Villalobos
May 29, 2021·Animal Science Journal = Nihon Chikusan Gakkaihō·Lucas Jado ChagasFlávio Augusto Portela Santos
Jul 27, 2021·Animal : an International Journal of Animal Bioscience·P Guarnido-LopezG Cantalapiedra-Hijar

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