Assays for deterioration and estimates of feeding value of corn silage
| Autor: | Moe, Aaron J. |
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| Rok vydání: | 1982 |
| Předmět: | |
| Druh dokumentu: | Diplomová práce |
| Popis: | 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 Sy.x of 5.29 and 5.86 for ADF and DM, respectively. Multiple regression analyses resulted in minor improvements in Sy.x. 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, Sy.x 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 Sy.x of 4.04. The prediction of corn silage IVDOM by NIR or ADF were similar. Master of Science |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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