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Crop Science Abstract -

In Vivo and In Vitro Relationships in Evaluating Digestibility of Selected Smooth Bromegrass Synthetics1


This article in CS

  1. Vol. 13 No. 5, p. 575-576
    Received: Apr 9, 1973

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  1. L. D. Kamstra,
  2. J. G. Ross and
  3. D. C. Ronning2



Reliable laboratory tests to indicate forage quality have a tremendous potential as tools for screening material in a breeding program. Within a 6-clone diallel cross of smooth bromegrass (Bromus inermis Leyss.) those progenies showing highest and lowest in vitro digestibility were identified and then produced as 2-clone synthetics and tested in a large scale experiment. The synthetics were more digestible in vivo and in vitro than the cultivar ‘Sac,‘ but no digestibility differences occurred between synthetics. Although the expected difference between the synthetics was not found, the high correlation between the in vivo and in vitro techniques indicates that the in vitro method may be used as a selection tool in breeding. The reason for the lack of correspondence between spaced plant and field results is being investigated.

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