Abstract

Estimates of milk and blood constituents by Fourier-transform mid-infrared (FTIR) analysis of milk offer a promising tool to monitor energy deficit in dairy cows. We sought to explore: 1) diurnal changes in plasma non-esterified fatty acids (NEFA) and β-hydroxybutyrate (BHB) and FTIR estimates of milk BHB and milk predicted blood NEFA (pbNEFA); 2) correlation between plasma BHB and NEFA; and 3) effect of hyperketonemia (HYK) on circadian patterns of plasma and milk metabolites.

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