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Table 1 Nutritional and fatty acid composition (% of total fatty acids) of the diets fed to calf- and yearling-finished steers

From: Subcutaneous fatty acid composition of steers finished as weanlings or yearlings with and without growth promotants

  Calf-fed steers Yearling-fed steers
Variable Finishing diet Fall pasture Grower diet Summer pasture Finishing diet
Nutrient, % DM      
Crude protein 13.2 ± 1.09 9.40 ± 2.83 12.6 ± 1.52 13.4 ± 2.51 12.6 ± 0.49
ADF 15.2 ± 3.68 36.8 ± 4.54 35.3 ± 2.32 34.4 ± 2.71 16.7 ± 1.22
NDF 27.6 ± 4.45 55.6 ± 3.86 55.1 ± 1.81 56.7 ± 2.68 28.1 ± 1.88
Calcium 0.6 ± 0.19 0.7 ± 0.13 0.7 ± 0.07 0.8 ± 0.21 0.9 ± 0.27
Phosphorus 0.4 ± 0.09 0.3 ± 0.03 0.3 ± 0.03 0.3 ± 0.14 0.5 ± 0.06
TDN, % 75.2 ± 1.72x 57.0 ± 5.91y 59.0 ± 1.08y 60.2 ± 3.53y 74.5 ± 0.57z
ME2, MJ/kg DM 11.4 ± 0.26x 8.61 ± 0.89 y 8.91 ± 0.16y 9.1 ± 0.53y 12.6 ± 0.49z
Fatty acid, % total fatty acids     
C16:0 18.7 ± 1.40 24.0 ±1.32 22.1 ± 0.71 28.0 ± 3.82 18.8 ± 0.41
C18:0 2.15 ± 0.17 2.51 ± 0.06 2.07 ± 0.22 2.73 ± 0.56 1.75 ± 0.09
c 9-18:1 20.8 ± 1.88 9.67 ± 6.32 14.1 ± 5.37 4.67 ± 2.12 18.5 ±0.27
c 11-18:1 4.37 ± 0.61 2.23 ± 0.60 2.62 ± 0.86 1.39 ± 0.54 4.00 ± 0.26
C18:2n-6 43.3 ± 0.87 23.7 ± 8.40 28.8 ± 2.39 15.2 ± 0.21 46.5 ± 0.71
C18:3n-3 9.20 ± 0.72 30.1 ± 10.3 26.1 ± 8.09 38.7 ± 8.69 9.00 ± 0.56
Total fatty acids (mg/g DM) 2.30 ± 0.69 1.00 ± 0.69 1.25 ± 0.69 0.96 ± 0.69 2.34 ± 0.69
  1. xEquations used to calculate total digestible nutrients (TDN) and metabolizable energy (ME) for the finishing diet fed to calf-fed steers: %TDN = 82.299 - (ADF, % × 0.467); ME, MJ/kg DM = ((%TDN/100) × 4.4 × 0.82) x 4.184 MJ/Mcal); yEquations used to calculate TDN and ME for the pasture, grower’s diet and summer pasture fed to yearling steers: %TDN = 82.299 - (ADF, % × 0.467); ME, MJ/kg DM = ((%TDN/100) × 4.4 × 0.82) × 4.184 MJ/Mcal); zEquations used to calculate TDN and ME for the finishing diet fed to yearling steers: %TDN = 82.299 - (ADF, % × 0.467); ME, MJ/kg DM = ((%TDN/100) × 4.4 × 0.82) x 4.184 MJ/Mcal).