Corn silages were selected from samples analyzed in the Virginia Tech Forage Testing Laboratory. A sample selection scheme employing observation of silage quality indicators (color, mold, aroma, fermentation type) was utilized to obtain a sample set encompassing a wide range in deterioration. In vitro digestible organic matter (IVDOM) was the criteria used to estimate feeding value. The full data set contained 142 corn silages which averaged 59.8 ± 6.6% and ranged from 38.5 to 74.7% IVDOM. Simple and multiple regression of IVDOM on chemical constituents were performed for the full data set and within fermentation groups. Coefficients of determination (R² ) revealed that acid detergent fiber (ADF) and dry matter (DM) explained the largest proportion of variation in IVDOM. The simple regression on the full data set resulted in R² of .352 and .208 with standard errors of the prediction S<sub>y.x</sub> of 5.29 and 5.86 for ADF and DM, respectively. Multiple regression analyses resulted in minor improvements in S<sub>y.x</sub>. These data suggest the inclusion of other variables besides ADF and DM in the prediction equation is unwarranted.
Corn silage IVDOM was predicted employing Near-infrared reflectance techniques. A calibration resulted in R² of .77, S<sub>y.x</sub> of 5.38. The calibration equation was tested for the prediction of IVDOM for an additional 90 corn silages. The regression of NIR predicted IVDOM resulted in an R² of .37 and S<sub>y.x</sub> of 4.04. The prediction of corn silage IVDOM by NIR or ADF were similar. / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/80227 |
| Date | January 1982 |
| Creators | Moe, Aaron J. |
| Contributors | Dairy Science |
| Publisher | Virginia Polytechnic Institute and State University |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | en_US |
| Detected Language | English |
| Type | Thesis, Text |
| Format | vii, 91, [2] leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 8634422 |
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