Determination of in situ ruminal degradation of phytate phosphorus from single and compound feeds in dairy cows using chemical analysis and near-infrared spectroscopy

Animal : an International Journal of Animal Bioscience
Eva HaeseMarkus Rodehutscord

Abstract

The ruminal degradation of P bound in phytate (InsP6) can vary between feeds, but data on ruminal degradation of InsP6 from different feedstuffs for cattle are rare. One objective of this study was to increase the data base on ruminal effective degradation of InsP6 (InsP6ED) and to assess if InsP6ED of compound feeds (CF) can be calculated from comprising single feeds. As a second objective, use of near-infrared spectroscopy (NIRS) to predict InsP6 concentrations was tested. Nine single feeds (maize, wheat, barley, faba beans, soybeans, soybean meal (SBM), rapeseed meal (RSM), sunflower meal (SFM), dried distillers' grains with solubles (DDGS)) and two CF (CF1/CF2), consisting of different amounts of the examined single feeds, were incubated for 2, 4, 8, 16, 24, 48 and 72 h in the rumen of three ruminally fistulated Jersey cows. Samples of CF were examined before (CF1/CF2 Mash) and after pelleting (CF1/CF2 Pellet), and InsP6ED was calculated for all feeds at two passage rates (InsP6ED5: k = 5%/h; InsP6ED8: k = 8%/h). For CF1 and CF2, InsP6ED was also calculated from values of the respective single feeds. Near-infrared spectra were recorded in duplicate and used to establish calibrations to predict InsP6 concentration. Besides a...Continue Reading

References

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Jul 26, 2019·Archives of Animal Nutrition·Goran GrubješićMarkus Rodehutscord

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Citations

Nov 3, 2021·Journal of the Science of Food and Agriculture·Eva HaeseMarkus Rodehutscord

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Methods Mentioned

BETA
PCA

Software Mentioned

SAS
SpectraStar
Ucalibrate
MATLAB
Fathom Toolbox
GraphPad Prism

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