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This article in CS

  1. Vol. 9 No. 5, p. 634-637
     
    Received: Mar 14, 1969
    Published: Sept, 1969


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doi:10.2135/cropsci1969.0011183X000900050038x

Variations in Nutritive Value Among Species of the Medicago Genus as Measured by Laboratory Techniques1

  1. D. W. Allinson,
  2. F. C. Elliott and
  3. M. B. Tesar2

Abstract

Abstract

Individual alfalfa clones derived from populations of Medicago sativa L., M. falcata L., M. glutinosa M. B., and M. coerulea Less. were analyzed for nutritive value by using (a) in vitro fermentation techniques and (b) fiber analyses.

Considerable variation in estimated nutritive value occurred both within and between populations. The range of values of percent dry matter disappearance (DMD), using a 6-hr in vitro fermentation technique, within populations was from 45.0 to 27.1% (M. sativa, ‘DuPuits’) to 33.3 to 27.7% (M. glutinosa). The corresponding range between populatiou means was 35.4 (M. sativa, ‘DuPuits’) to 26.3% (M. falcata, ‘Wisconsin 460’). Clones of high estimated uutritive value were characterized by being relatively low in fibrous or cell wall constituents. Similarly, the production of acetic, propionic, and butyric acids was consistently greater in fermentations when clones of l~igh estimated nutritive value were used as substrates compared to clones of low estimated nutritive value.

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