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Table 1 Chemical composition of the dietary ingredients offered during the residual feed intake experimental period

From: Stress and immunological response of heifers divergently ranked for residual feed intake following an adrenocorticotropic hormone challenge

  RFI experimental period
Variable Silage Concentrate
Dry matter, g/kga 315 ± 33.9 822 ± 0.7
Composition of DM, g/kg DM unless otherwise stated
 pH 3.9 ± 0.15 NDb
 In vitro DMD 693 ± 47.3 726 ± 44.0
 In vitro DOMDc 625 ± 37.1 676 ± 44.6
 OMDd 677 ± 47.5 726 ± 46.9
 Ash 75 ± 11.7 73 ± 1.6
 Crude protein 121 ± 10.3 115 ± 11.6
 NDF 532 ± 54.7 244 ± 31.4
 Starch ND 230 ± 56.3
ME, MJ/kg DMe 10.41 ± 0.45 11.56 ± 0.36
Fermentation characteristicsf, g/kg
 Lactic acid 102 ± 49.8 ND
 Acetic acid 33 ± 7.7 ND
 Propionic acid 2.9 ± 0.66 ND
 Butyric acid 4.5 ± 2.39 ND
 Ethanol 13.4 ± 2.82 ND
 Ammonia N, g/kg total N 76 ± 10.9 ND
  1. aCorrected for loss of volatiles during oven drying
  2. b ND not determined
  3. cDigestible OM in the total DM, measured in vitro
  4. dOM digestibility, measured in vitro
  5. eEstimated based on in vitro digestible OM in total DM (AFRC, 1993)
  6. fExpressed as g/kg volatile corrected DM