TABLE 2

Chemical composition, fermentation products, and mycotoxin concentration of purple prairie clover ensiled without or with polyethylene glycol in terminal silage and after 7 and 14 days of aerobic exposure

ItemTerminal silage (n = 5)Aerobic exposure silage (n = 4)
Day 0SEMPDay 7SEMPDay 14SEMP
ControlPPC-pControlPPC-pControlPPC-p
Chemical composition (g/kg DM)
    Dry matter (g/kg forage)305.94311.764.770.375387.51388.965.100.848376.59389.443.800.054
    Organic matter911.34910.251.400.599912.56913.640.700.383902.89901.932.940.826
    Neutral detergent fiber437.43428.2813.550.637437.11438.404.650.850527.00509.7720.080.545
    Acid detergent fiber357.21366.938.270.430369.04380.785.760.199442.74420.3313.060.292
    Acid detergent-insoluble nitrogen9.037.760.13<0.0018.856.320.12<0.00111.2610.261.360.658
    Neutral detergent-insoluble nitrogen7.458.210.440.27011.9210.300.600.09513.0613.321.060.878
    Acid detergent lignin70.5682.099.170.400103.0798.626.290.622148.78132.498.600.252
    Water-soluble carbohydrates2.400.300.12<0.0010.690.470.060.0340.510.420.090.482
    Total N28.1628.240.060.45728.6228.320.180.36327.8228.450.830.569
    Soluble N0.290.450.02<0.0010.260.450.02<0.0010.220.420.02<0.001
    Nonprotein N0.350.500.02<0.0010.240.380.01<0.0010.160.350.02<0.001
    Extractable condensed tannins27.4 ± 1.5aNDb4.0 ± 0.5aNDNDND
Fermentation products (g/kg DM)
    pH5.024.610.01<0.0014.984.660.02<0.0018.818.960.180.586
    Lactic acid40.9991.045.36<0.00127.1363.482.57<0.0011.923.140.400.161
    Total VFA15.5926.841.700.00222.3836.122.550.0091.851.600.460.730
    Acetic acid14.8225.382.680.02221.7833.932.580.0161.140.880.320.635
    Propionic acid0.170.970.06<0.0010.171.590.12<0.0010.050.100.020.184
    Butyric acid0.380.360.010.4080.330.410.050.2910.290.340.010.087
    Minor VFAc0.280.170.040.1010.120.160.010.0870.260.300.040.539
    Succinic acid5.542.600.39<0.0013.721.840.320.0061.200.660.480.453
    Lactic acid:acetic acid ratio2.493.620.180.0031.281.800.170.0671.093.600.200.001
    Ammonia N2.703.740.14<0.0012.103.260.180.0042.134.220.250.001
Mycotoxin concn (μg/kg DM)
    Deoxynivalenol108.6190.93.930.004150.2186.42.310.008474.7679.410.920.006
    Ochratoxin A12.044.05.290.00313.6739.513.340.00925.6071.641.680.003
  • a Values = mean ± standard error.

  • b ND, not detectable.

  • c Minor VFA is isobutyric acid + valeric acid + isovaleric acid + caproic acid.