Evaluation of between-cow variation in milk urea and rumen ammonia nitrogen concentrations and the association with nitrogen utilization and diet digestibility in lactating cows

Journal of Dairy Science
P HuhtanenK J Shingfield

Abstract

Concentrations of milk urea N (MUN) are influenced by dietary crude protein concentration and intake and could therefore be used as a biomarker of the efficiency of N utilization for milk production (milk N/N intake; MNE) in lactating cows. In the present investigation, data from milk-production trials (production data set; n=1,804 cow/period observations from 21 change-over studies) and metabolic studies involving measurements of nutrient flow at the omasum in lactating cows (flow data set; n=450 cow/period observations from 29 studies) were used to evaluate the influence of between-cow variation on the relationship of MUN with MNE, urinary N (UN) output, and diet digestibility. All measurements were made on cows fed diets based on grass silage supplemented with a range of protein supplements. Data were analyzed by mixed-model regression analysis with diet within experiment and period within experiment as random effects, allowing the effect of diet and period to be excluded. Between-cow coefficient of variation in MUN concentration and MNE was 0.13 and 0.07 in the production data set and 0.11 and 0.08 in the flow data set, respectively. Based on residual variance, the best model for predicting MNE developed from the production...Continue Reading

References

Nov 1, 1977·The British Journal of Nutrition·A Z MehrezI McDonald
Sep 1, 1986·Journal of Dairy Science·R A ErdmanJ H Vandersall
Aug 1, 1967·Clinica Chimica Acta; International Journal of Clinical Chemistry·H McCullough
May 1, 1984·Journal of Dairy Science·J D Oldham
Nov 9, 2001·Journal of Dairy Science·A J Kauffman, N R St-Pierre
Feb 28, 2002·Journal of Dairy Science·R A KohnE Russek-Cohen
May 23, 2002·Journal of Dairy Science·J S JonkerJ High
Feb 6, 2004·Journal of Dairy Science·J NousiainenP Huhtanen
Apr 28, 2005·Journal of Intensive Care Medicine·Stephen J TaylorClaire Jewkes
Mar 21, 2007·Journal of Dairy Science·W M StoopJ A M van Arendonk
Oct 18, 2007·Journal of Animal Science·C K Reynolds, N B Kristensen
Jun 17, 2009·Journal of Dairy Science·C BastinN Gengler
Oct 9, 2012·Journal of Dairy Science·M AguilarR E James

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Citations

Jan 19, 2016·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
Sep 25, 2012·Journal of Dairy Science·J W SpekA Bannink
Jul 24, 2012·Animal Reproduction Science·V P GathF J Mulligan
Aug 13, 2017·Tropical Animal Health and Production·Tiago Pansard AlvesHenrique Mendonça Nunes Ribeiro-Filho
Dec 30, 2017·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
Nov 27, 2019·Animal : an International Journal of Animal Bioscience·S Giger-ReverdinN C Friggens
Jun 2, 2020·Journal of Dairy Science·S M Moore, T J DeVries
Aug 13, 2020·Animals : an Open Access Journal From MDPI·Himali TharanganiDengpan Bu
Aug 6, 2020·Animals : an Open Access Journal From MDPI·Lorena Carmona-FloresSerkan Ates
Jul 21, 2020·Journal of Dairy Science·A GuinguinaP Huhtanen
Apr 13, 2018·Metabolites·Tom F O'CallaghanR Paul Ross
Jul 18, 2017·Tropical Animal Health and Production·Dannylo Oliveira SousaLuis Felipe Prada Silva
Jan 7, 2021·Animals : an Open Access Journal From MDPI·Philip C GarnsworthyNeil Saunders
Feb 13, 2021·Animals : an Open Access Journal From MDPI·Anna Lavery, Conrad P Ferris
Nov 3, 2020·Journal of Dairy Science·Degong PangSophie Krizsan
Apr 4, 2021·Animals : an Open Access Journal From MDPI·Hewa Bahithige Pavithra Chathurangi AriyarathneNicolas Lopez-Villalobos
Jul 27, 2021·Animal : an International Journal of Animal Bioscience·P Guarnido-LopezG Cantalapiedra-Hijar

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