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Table 4 Plasma variables of lactating cows selected for phenotypic divergence in residual feed intake (RFI)

From: Nitrogen partitioning and microbial protein synthesis in lactating dairy cows with different phenotypic residual feed intake

Itemsa Low
RFI
High
RFI
SEM P valueb
RFI Day RFI × Day
Protein metabolism
 Total protein, g/L 70.8 71.8 0.99 0.51 0.75 0.39
 Albumin (A), g/L 26.7 27.6 0.41 0.12 0.78 0.54
 Globulin (G), g/L 44.2 44.2 1.02 0.99 0.81 0.51
 A/G 0.61 0.63 0.02 0.39 0.92 0.69
 BUN, mmol/L 5.63 6.23 0.31 0.18 0.21 0.18
 Creatinine, μmol/L 74.9 72.2 2.27 0.38 0.17 0.43
Energy substrates
 Glucose, mmol/L 3.61 3.48 0.09 0.35 0.42 0.61
 NEFA, μmol/L 118 109 6.79 0.35 0.01 0.10
 Triglyceride, μmol/L 0.17 0.28 0.04 0.09 0.75 0.95
 Cholesterol, mmol/L 7.98 7.55 0.27 0.27 0.11 0.42
Liver function
 ALT, U/L 26.2 28.3 0.80 0.08 0.27 0.71
 AST, U/L 91.4 88.7 5.00 0.71 0.43 0.85
 ALP, U/L 34.6 47.0 5.14 0.11 0.13 0.26
 Total bilirubin, μmol/L 1.56 1.49 0.06 0.43 0.49 0.64
  1. aBUN blood urea nitrogen, NEFA nonesterified fatty acids, ALT alanine aminotransferase, AST aspartate aminotransferase, ALP alkaline phosphatase
  2. bP value associated with RFI, time, and the interaction of RFI and time