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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