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Published in Crop Sci 20:695-699 (1980)
© 1980 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Planting Pattern on Estimated Digestibility of Smooth Bromegrass1

P. O. Ugherughe, P. N. Drolsom and J. R. Davis2

Digestibility estimates of most forage grasses in the early stages of breeding programs are based upon samples obtained from spaced plants in nurseries rather than from solid stands as grown on farms. The purpose of this research was to examine the relationship between digestibility estimates of spaced plants and solid stands of smooth bromegrass (Bromus inermis Leyss.).

Whole plants and plant parts of 30 smooth bromegrass genotypes were evaluated for digestibility for 2 years. The acid-pepsin and the modified two-stage in vitro digestion techniques were used with three sampling dates each year.

In both years, genotypes differed significantly in stem, leaf, and panicle acid-pepsin dry matter disappearance (APDMD) at each harvest under the two planting patterns, except for the first harvest of solid stands in the 2nd year. No differences were found among genotypes for whole plant APDMD under solid stands for each of the three harvests in 1978. Spaced plant harvests differed significantly in APDMD in the 2 years while there were no significant differences in APDMD among harvests of solid stands in 1978. Among the plant parts at the first harvest, the APDMD of leaves and stems correlated best with whole plant APDMD, with leaves the highest.

Key Words: Bromus inermis Leyss. • Spaced plants • In vitro dry matter disappearance (IVDMD) • Acidpepsin dry matter disappearance (APDMD) • Forage quality

1 Contribution of the Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706. Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin, Madison, and by USDA-SEA Hatch 1794. Part of a dissertation submitted by the senior author in partial fulfillment of the Ph.D. Degree.

2 Former graduate assistant (now Dep. of Crop Science, Univ. of Maiduguri, Maiduguri, Nigeria), professor, and specialist, Dep. of Agronomy.

Received for publication March 13, 1980.




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Copyright © 1980 by the Crop Science Society of America.