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

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.

Key Words: Dry matter intake • Daily gain • Nutritive value intake • Bromus inermis Leyss

² Professor of Animal Science, Professor of Plant Science, and Assistant in Animal Science, South Dakota State University, Brookings 57006.

Received for publication April 9, 1973.