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Published online 1 February 1957
Published in Agron J 49:59-62 (1957)
© 1957 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Heritability In Standard Units1

K. J. Frey and T. Horner2

Synopsis: A comparison was made between heritability percentages calculated by two regression methods, the conventional, and the standard unit or correlation. Their comparative reliability was determined by comparing predicted and actual gains in hypothetical selection experiments for date of heading in oat crosses. In an F3-F4, selection experiment, the mean actual and predicted gain in days was 2.8 and 1.5 respectively when conventional heritabilities were used. With the standard unit method, the predicted and actual gains were both 0.9 standard deviation units. In an F2-F4 comparison, both methods showed satisfactory agreement between actual and predicted gains.

1 Joint contribution from the Agronomy Department and Statistical Laboratory, Iowa State College. Journal Paper No. J-2846 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 1176. In cooperation with the Field Crops Research Branch, ARS., U.S.D.A.

2 Professor of Farm Crops and Assistant Professor of Statistics, respectively.

Received for publication November 23, 1955.


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Copyright © 1957 by the American Society of Agronomy.