Sally Flis, Ph.D. – Feed and Crop Support Specialist

Last month I summarized the results for fresh corn silage samples we had come into the forage lab in September. As difficult as it is to believe, October is over and we had another 500 fresh corn silage samples from NY and PA in the lab.

September 2015 Fresh Corn Silage Sample Results

StateDM, %CP,
% DM
ADF,
% DM
NDF,
% DM
Starch,
% DM
Starch Digestibility,
% Starch
Ash,
% DM
CSPS
NY (n=347)34.2 ± 5.97.3 ± 0.924.6 ± 3.242.8 ± 4.633.6 ± 6.164.7 ± 10.33.6 ± 0.861.3 ± 8.6
PA (n=173)33.2 ± 5.56.6 ± 1.125.3 ± 3.243.8 ± 4.733.8 ± 5.166.1 ± 7.43.4 ± 1.0-

October 2015 Fresh Corn Silage Sample Results

StateDM, %CP,
% DM
ADF,
% DM
NDF,
% DM
Starch,
% DM
Starch Digestibility,
% Starch
Ash,
% DM
NY (n=184)34.1 ± 5.47.5 ± 0.924.2 ± 3.642.6 ± 5.634.7 ± 6.159.0 ± 10.23.5 ± 0.8
PA (n=272)38.5 ± 6.56.8 ± 1.024.7 ± 3.042.9 ± 4.434.9 ± 5.365.0 ± 10.43.3 ± 1.1

Starch values are up from what we saw in September of 2014 (NY: 28.9  6.6, Starch, % DM and PA: 30.6 5.8, Starch, % DM) and very close to the 14 year average, 33.1 7.8 % DM. Neutral detergent fiber (NDF) is lower than in September of 2014 (NY: 45.4  5.3, NDF, % DM and PA: 45.0 5.0, NDF, % DM).

Samples received in October 2015 had slightly higher starch than those submitted in September, about 1.0%. Starch digestibility decreased more in samples submitted from NY versus PA in October compared to September (5.7 % vs 1.1 % decrease). Starch values are up from October of 2014 for NY samples (NY: 31.1  6.4, Starch, % DM), but the same for PA. Neutral detergent fiber (NDF) is lower than in September of 2014 for NY samples (NY: 44.9  5.2, NDF, % DM) and the same for PA: 42.0 4.2, NDF, % DM.

Results of fresh corn silage are important to planning inventory management, but taking samples as you are feeding out corn silage is important to avoid overfeeding starch, because it has been found that starch digestibility increases with ensiling time.

You can find more sample results at our Interactive Feed Library.