HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Van Vleck, L. D. Articles by Mirande, S. L. Search for Related Content PubMed Articles by Van Vleck, L. D. Articles by Mirande, S. L.

Heritability Estimates of Milk Production from Daughter on Dam Regression by Year and Management Level

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

Heritability estimated by year of freshening for first-lactation milk records of artificially sired Holstein cows in the northeastern United States from daughter on dam regression averaged about .34 on the linear scale and .31 on the logarithmic scale. Little change could be detected from 1965 to 1982. Number of daughter-dam pairs was 197,338. Heritability estimates on the .5 and .4 power scales always were bounded by estimates on the linear and log scales. Heritability estimates were smallest in low management levels. Residual standard deviations for measurements to the .4 power were similar for all levels of management for a particular year, although a tendency was for the residual standard deviation to be larger in the low management level and smaller in the high management level.

¹ Facultad de Ciencias Veterinarias, Buenos Aires, Argentina.