| Autor: |
Gray, Alan M., Hill, Morris |
| Zdroj: |
Journal of Natural Resources & Life Sciences Education; September 1994, Vol. 23 Issue: 2 p109-112, 4p |
| Abstrakt: |
Relative feed value (RFV) is an increasingly important marketing tool for alfalfa (Medicago salivaL.) hay in some areas of the Great Plains and the Rocky Mountains. Persistent reports of consistently different RFV results from two commercial labs prompted a case study on 10 harvest lots of alfalfa hay. Within each harvest lot, 20 core samples were aggregated, mixed, and then subsampled with a riffle splitter. Subsamples from each harvest lot were randomly assigned to different analytical procedures in each lab. The study found that: (i) significant differences can occur in forage analysis results of a harvest lot of hay when conducted by wet chemistry (WC) procedures in two different labs, (ii) near infrared reflectance spectroscopy (NIRS) procedures in two different labs may yield significantly different results, (iii) WC and NIRS results within the same lab can be significantly different, and (iv) these differences could be economically important due to the increasing use of relative feed value in the marketing of alfalfa hay. |
| Databáze: |
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