Evaluation Procedures

Hybrid perfomance at Branch County, MI

Hybrid perfomance at Lenawee County, MI

Hybrid perfomance at Wood County, OH

Hybrid perfomance in Zone 1 Regional Average

Seed source of hybrids


Entry Forms

2015 Ohio-Michigan Silage Test

Rich Minyo, Peter Thomison, and William Widdicombe

In 2015, we conducted a joint trial with Michigan State University (MSU) adding one Ohio silage location to Michigan's two southern (Zone 1) silage locations. The Ohio test site was located in our Northwest Region at Hoytville (Wood County) The two MSU sites are located in Branch and Lenawee counties which are on the Ohio/Michigan state line. The test results from the three locations are treated as one region. The plots were planted with 4 row air type planters and maintained by each respective state utilizing standard production practices. The center 2 rows were harvested with MSU's self propelled forage harvester. Silage tests were harvested uniformly as close to half milk line as possible. Near Infrared Reflectance (NIR) Quality Analysis was performed by MSU using their current procedures. Silage results present the percent dry matter of each hybrid plus green weight and dry weight as tons per acre. Other data presented include percent stand, the percentage of in vitro digestible dry matter, acid detergent fiber, neutral detergent fiber, crude protein and starch. Milk production in pounds per ton and pounds per acre are estimated using MILK2006. More information on procedures and additional 2015 MSU test data can be viewed on the web at http://www.css.msu.edu/varietytrials/corn/corntrials.htm.


Testing procedures (randomization, replication, planting rates, etc.) for silage evaluation are the same as those utilized for the grain trials. Plots were four rows wide, and the center two rows were harvested for yield and quality.

Silage plots were harvested with a two-row self-propelled forage harvester. Electronic scales mounted on the chopper measured plot weights. Total plot weight is used to calculate green tons per acre (GT/A). Sub samples were collected (fodder plus grain), weighed, oven dried until weight loss was zero, then weighed again to determine the percent dry matter (%DM). Dry tons per acre (DT/A) is calculated using GT/A multiplied by %DM. The samples were ground using a 1.0 mm screen before conducting quality analysis using NIR (near infrared reflectance).

Corn Silage Information 2015

SOIL TEST (pH,P,K) 6.2,109.5,107.5 7.25,135,257 5.8,114,435
PLANTING / HARVESTING DATES May 13/Sept 15 May 14/Sept 14 May 8/Sept 8
STAND 100% / AVERAGE 35,244 / 34,922 35,244 / 34,962 34,452 / 31,834
FERTILIZER (N,P,K) 200-9-3 154-9-3 +MANURE 205-24-0

Silage Analysis

All silage tables provide silage quality data as determined by NIR analysis on freshly dried samples. Data is provided for individual locations and also averaged over multiple locations. Near infrared spectral analysis involves irradiating the ground sample with light in the near infrared spectrum (1,100 to 2,500 nm). The illuminated sample absorbs light proportional to specific chemical and physical properties. The reflected energy is measured and was correlated statistically with the 2015 near infrared spectroscopy (NIRS) equation established for forage quality levels. Results of the six quality traits analyzed are presented in the quality tables. The six quality traits are:

  • IVD= (in vitro) digestible dry matter. IVD is a measure of forage digestibility. Higher IVD is desirable.
  • ADF=acid detergent fiber. Acid detergent fiber represents the less digestible portion of the corn forage, containing cellulose, lignin and heat damaged protein. ADF is closely related to the digestibility of forages. Lower ADF implies the forage is more digestible. More mature plant material will contain higher ADF concentrations. A low concentration of ADF is desirable.
  • NDF=neutral detergent fiber. This is a measure of the fiber content of the corn forage. It is less digestible than non-fiber constituents of the forage. Forages with high NDF levels have lower energy. NDF is also a measure of potential forage intake. High NDF levels decrease the potential forage intake. Low NDF content is desirable.
  • NDFD=neutral detergent fiber digestibility. The portion of neutral detergent fiber digested by animals at a specified level of feed intake. High NDFD is desirable.
  • CP=crude protein. Forages are generally supplemented with high protein concentrates such as soybean meal to increase the protein content of ruminant diets. Corn hybrids with high protein levels require less supplementation and therefore result in lower feed costs. High protein content is desirable.
  • STRCH=starch. Starch from the grain, along with the digestible component of the fiber, accounts for the majority of the energy in corn silage.

Silage quality traits are reported on a dry matter basis (100 percent DM). Quality traits in these tables are intended for use in hybrid selection only. Analysis for the balancing of feed rations should be analyzed from hybrids grown on each individual farm.


An updated calculation using the MILK2006 equation (UW-Madison Dairy Science Department) was used to estimates MK/T (milk per ton) and MK/A (milk per acre). MILK2006 estimates the dry matter intake using the NDF and CWD (cell wall digestibility) parameters of the sample. The updated equation utilizes CP, fat, and sugar as well as the organic acid fractions along with their total-tract digestibility coefficients to estimate energy. Whole plant dry matter was calculated to 34% for all hybrids and digestibility coefficients used for the fat and sugars as well as the organic acid fractions were held constant. MILK2006 also assumes the weight of the cow is 1,350 lbs. and that it consumes a 30 percent NDF diet. Using National Research Council (NRC, 2001) energy requirements, the estimated intake of energy from corn silage is converted to milk per ton. Milk per acre is then calculated using the estimated values for milk per ton and dry matter yield per acre. For more information on the utility of MILK2006 please see: http://www.uwex.edu/ces/crops/uwforage/dec_soft.htm