Genetic variation in milk urea nitrogen concentration of dairy cattle and its implications for reducing urinary nitrogen excretion

Animal : an International Journal of Animal Bioscience
P R BeatsonH Eding

Abstract

Nitrogen (N) leached into groundwater from urine patches of cattle grazing in situ is an environmental problem in pasture-based dairy industries. One potential mitigation is to breed cattle for lower urinary nitrogen (UN) excretion. Urinary nitrogen is difficult to measure, while milk urea nitrogen concentration (MUN) is relatively easy to measure. For animals fed diets of differing N content in confinement, MUN is moderately heritable and is positively related to UN. However, there is little information on the heritability of MUN, and its relationship with other traits such as milk yield and composition, for animals grazing fresh pasture. Milk urea nitrogen concentration data together with milk yield, fat, protein and lactose composition and somatic cell count was collected from 133 624 Holstein-Friesian (HF), Jersey (J) and HF×J (XBd) cows fed predominantly pasture over three full lactations and one part lactation. Mean MUN was 14.0; and 14.4, 13.2 and 13.9 mg/dl for HF, J and XBd cows, respectively. Estimates of heritability of MUN were 0.22 using a repeatability model that fitted year-of-lactation by month-of-lactation by cow-age with days-in-milk within month-of-lactation and cow-age, and 0.28 using a test-day model analys...Continue Reading

References

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
Aug 9, 2003·Journal of Dairy Science·G M WoodD F Kelton
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Oct 13, 2009·Trends in Cell Biology·Erik Lee Snapp
Sep 25, 2012·Journal of Dairy Science·J W SpekA Bannink

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Citations

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
Jul 27, 2021·Animal : an International Journal of Animal Bioscience·P Guarnido-LopezG Cantalapiedra-Hijar
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Cameron J MarshallPablo Gregorini

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