Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:556-559 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Breeding for Improved Dry Matter Digestibility in Smooth Bromegrass (Bromus inermis Leyss.)1

D. A. Sleper, P. N. Drolsom and N. A. Jorgensen2

A diallel cross involving six smooth bromegrass (Bromis inermis Leyss.) clones was used to gain information on the inheritance of digestibility as measured by the acidpepsin dry matter disappearance (APDMD) technique. APDMD was evaluated on the whole forage at two harvest dates in 1971 and 1972. Plant fractions (blades, sheaths, and stems) were also evaluated for APDMD in 1972 on diallel progenies, excluding reciprocals. Progenies differed significantly for the whole forage APDMD at first and second harvest and for the APDMD of the blades. No significant differences were found for APDMD of the sheaths and stems. General combining ability was significant for APDMD of the whole forage at both harvest dates and for APDMD of the blades. Maternal effects were significant for the whole forage APDMD at the second harvest. Progenies x year interactions were not significant for the whole forage APDMD. Heritability and gain from selection values indicated that improvement of whole forage and blade APDMD is possible through breeding.

Key Words: Diallel cross • General combining ability • Specific combining ability • Heritability • Gain from selection • Acid-pepsin dry matter disappearance

1 Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, Wis. 53706. Part of a dissertation submitted by the senior author in partial fulfillment of requirements for the Ph.D, degree.

2 Former Research Assistant (now Assistant Professor of Agronomy, IFAS, University of Florida, Gainesville, Fla. 32601), Professor of Agronomy, and Associate Professor of Dairy Science.

Received for publication March 22, 1973.




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Copyright © 1973 by the Crop Science Society of America.