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Prediction of Leaf Fraction, Neutral Detergent Fiber, and Intake of Ground Forage Samples by Airflow Segregation 1
Author(s) -
Rao Kanneganti V.,
Van Soest P. J.,
Fick G. W.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700030038x
Subject(s) - airflow , forage , neutral detergent fiber , dry matter , biology , fraction (chemistry) , agronomy , zoology , temperate climate , botany , chemistry , chromatography , physics , thermodynamics
Research on forage nutritional quality is facilitated by procedures that are fast and simple and that require only small samples. This is especially true for dry matter intake, which can now be accurately evaluated only by feeding trials. In order to evaluate airflow segregation as a method of forage analysis, oven dried forage samples, ground to pass a 2‐mm screen, were separated into coarse and fine portions using several airflow speeds in a seed cleaner. An airflow speed setting of 7 units gave the cleanest separation of leaf from stem material, but contamination of the coarse portion with leaf fragments and of the fine portion with stem fragments could be easily seen at 4✕ magnification. However, for alfalfa ( Medicago sativa L.), actual leaflet fraction of the original herbage regressed on coarse portion of the separated material gave the equation Y = 1.669 – 2.665. X , n = 25,r 2 = 0.99, and a root error mean square of 0.024. Neutral detergent fiber (NDF) and intake of alfalfa herbage were highly correlated to the coarse portion (r = 0.85 and ‐0.87, respectively), but this was not true when other forage species were considered. Airflow separation can be calibrated to predict leaf and NDF fractions of pure alfalfa samples, but a universal relationship was not found across a range of temperate forages.