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 Henderson, C. R. Search for Related Content PubMed Articles by Van Vleck, L. D. Articles by Henderson, C. R.

Estimation of Missing Monthly Test-Day Records

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Three methods, within herd regression, regression ignoring herd effects, and a ratio factor method, of estimating a missing monthly test-day record from preceding or succeeding known test-day records are compared. The intra-herd regression method is considered to be better than regression ignoring herd effects or the ratio factor method. The regression procedure ignoring herd effects, however, is generally less than 10% less efficient than the intra-herd method and is recommended for use, since population averages are easier to obtain and to use than are the herd averages required for the intra-herd method. Factors are presented for estimating a missing monthly test-day record by the three methods when (1) the preceding monthly record is known, (2) the succeeding monthly record is known, and (3) both preceding and succeeding records are known.