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Genetic Variability in Forage Yield, Crude Protein Percentage, and Palatability in Reed Canarygrass, Phalaris arundinacea L.¹

Twenty clonal lines of reed canarygrass, Phalaris arundinacea L., and their topcross progenies were evaluated under two clipping management systems designed primarily to compare forage harvested in the fall after two-month and three-month regrowth periods. Objectives were to investigate the genetic variability in forage yield, crude protein percentage, and palatability to rabbits and sheep.

The differences among the clonal and progeny lines in forage yield and crude protein percentage were similar under the two management systems; however, the entry x year and entry x cutting interactions generally were statistically significant. Broad-sense heritabilities (mean basis) ranged from .77 to .88 for forage yield and from .44 to .70 for percentage crude protein. Narrow-sense heritabilities ranged from .33 to .44 for forage yield and from .19 to .41 for crude protein. The additive genetic variance (2CovPC) constituted from 40 to 59% of the total genetic variance.

Significant differences among clones and among topcross progenies in palatability of dried fall-cut forage were obtained in most cafeteria trials. When differences among the lines were significant, the parent-progeny correlations and the correlations between rabbit and sheep trials were usually significant.

Key Words: heritability • additive genetic variance • genetic advance • topcross progenies

² Formerly Research Associate (now Assistant Professor, Department of Agronomy, University of Missouri, Columbia, Mo. 65201), Associate Professor, and Professor of Agronomy, Iowa State University, Ames, Iowa 50010.

Received for publication November 30, 1967.

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