Table 2 Ingredient and chemical composition of the total mixed rations.
Control EO SEM P
Ingredient compositiona (g/kg DM)
Alfalfa hay (low quality) 51 52
Alfalfa hay (high quality) 76 74
Wheat silage 137 137
Corn silage 65 66
Alfalfa (fresh chop) 56 54
Citrus pulp (orange) 29 31
Corn grain (steam flaked) 122 122
Rumen inert fatb 22
EO premix 0 3.5
EO placebo 3.5 0
Premixc 457 461
Chemical composition (g/kg DM except as noted)
Dry matter (g/kg) 552 542 5.8 0.24
Organic matter 910 909 1.3 0.60
Ether extract 62 62 0.8 0.86
Crude protein 163 164 1.1 0.43
AD insoluble CP (g/kg CP) 65 66 1.7 0.49
Starch 123 130 4.0 0.20
Sugars 50 47 1.9 0.28
aNDF 339 340 3.0 0.77
aNDFom 321 323 1.6 0.38
ADF 224 225 2.3 0.72
ADFom 205 206 1.9 0.75
Lignin(sa) 48 48 1.5 0.98
Net energy (lactation, MJ/kg DM)d 7.03 7.03 0.081 0.66
Calcium 8.9 9.6 0.18 0.03
Phosphorous 4.1 4.2 0.04 0.12
Potassium 15.6 15.6 0.31 0.85
Sulfur 3.4 3.5 0.07 0.16
Magnesium 3.0 3.2 0.08 0.18
Sodium 4.0 4.1 0.16 0.91
Chloride 5.3 5.3 0.26 0.94
Zinc (mg/kg DM) 96 96 3.0 0.94
Manganese (mg/kg DM) 59 60 1.6 0.71
Iron (mg/kg DM) 360 376 28.8 0.66
Copper (mg/kg DM) 21.0 20.8 1.03 0.88
Cobalt (mg/kg DM) 1.11 1.10 0.053 0.86
Selenium (mg/kg DM)