Predicting feed intake and feed efficiency in lactating dairy cows using digesta marker techniques

Animal : an International Journal of Animal Bioscience
A GuinguinaP Huhtanen

Abstract

Direct measurement of individual animal dry matter intake (DMI) remains a fundamental challenge to assessing dairy feed efficiency (FE). Digesta marker, is currently the most used indirect technique for estimating DMI in production animals. In this meta-analysis we evaluated the performance of marker-based estimates against direct or observed measurements and developed equations for the prediction of FE (g energy-corrected milk (ECM)/kg DMI). Data were taken from 29 change-over studies consisting of 416 cow-within period observations. Most studies used more than one digesta marker. So, for each observed measurement of DMI, faecal dry matter output (FDMO) and apparent total tract dry matter digestibility (DMD), there was one or more corresponding marker estimate. There were 924, 409 and 846 observations for estimated FDMO (eFDMO), estimated apparent total tract DMD (eDMD) and estimated DMI (eDMI), respectively. The experimental diets were based mainly on grass silage, with soya bean or rapeseed meal as protein supplements and cereal grains or by-products as energy supplements. Across all diets, average forage to concentrate ratio on a dry matter (DM) basis was 59 : 41. Variance component and repeatability estimates of observed a...Continue Reading

References

Sep 1, 1996·Journal of Dairy Science·J Fuentes-PilaJ B Holter
Mar 5, 2003·Journal of Dairy Science·N R St-Pierre
Dec 9, 2014·Animal : an International Journal of Animal Bioscience·E E Connor
Sep 29, 2015·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·T MehtiöM H Lidauer
Mar 5, 2018·Journal of Dairy Science·S AhvenjärviM Lidauer

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Citations

Jul 21, 2020·Journal of Dairy Science·A GuinguinaP Huhtanen

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