Potential of milk mid-infrared spectra to predict nitrogen use efficiency of individual dairy cows in early lactation

Journal of Dairy Science
C GreletF Dehareng

Abstract

Improving nitrogen use efficiency (NUE) at both the individual cow and the herd level has become a key target in dairy production systems, for both environmental and economic reasons. Cost-effective and large-scale phenotyping methods are required to improve NUE through genetic selection and by feeding and management strategies. The aim of this study was to evaluate the possibility of using mid-infrared (MIR) spectra of milk to predict individual dairy cow NUE during early lactation. Data were collected from 129 Holstein cows, from calving until 50 d in milk, in 3 research herds (Denmark, Ireland, and the UK). In 2 of the herds, diets were designed to challenge cows metabolically, whereas a diet reflecting local management practices was offered in the third herd. Nitrogen intake (kg/d) and nitrogen excreted in milk (kg/d) were calculated daily. Nitrogen use efficiency was calculated as the ratio between nitrogen in milk and nitrogen intake, and expressed as a percentage. Individual daily values for NUE ranged from 9.7 to 81.7%, with an average of 36.9% and standard deviation of 10.4%. Milk MIR spectra were recorded twice weekly and were standardized into a common format to avoid bias between apparatus or sampling periods. Regre...Continue Reading

References

Jun 14, 2000·Animal Reproduction Science·W R Butler
Feb 6, 2004·Journal of Dairy Science·J NousiainenP Huhtanen
Jul 1, 2010·Animal : an International Journal of Animal Bioscience·S CalsamigliaA M van Vuuren
Feb 16, 2015·Journal of Dairy Science·C GreletF Dehareng
Jan 19, 2016·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty
May 22, 2017·Journal of Dairy Science·M KlaffenböckJ Sölkner
Nov 7, 2019·Animal : an International Journal of Animal Bioscience·M A KroghL Foldager

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Citations

Aug 9, 2020·Methods : a Companion to Methods in Enzymology·C GreletF Dehareng
Feb 13, 2021·Animals : an Open Access Journal From MDPI·Anna Lavery, Conrad P Ferris
Mar 7, 2021·Animals : an Open Access Journal From MDPI·Lei ZhangHélène Soyeurt
Jun 3, 2021·Animals : an Open Access Journal From MDPI·Anthony Tedde On Behalf Of The GplusE Consortium

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