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 Allaire, F. R. Articles by Secrist, N. L. Search for Related Content PubMed Articles by Allaire, F. R. Articles by Secrist, N. L.

Estimation of Frequency for Recessive Genes Based on Known Ancestral Genotypes¹

The Department of Dairy Science, The Ohio State Universityand The Ohio Agricultural Research and Development Center, Columbus, OH 43210

ABSTRACT

Methods for estimating gene frequencies with known genotypes of "original parents" are presented. The "original parent" concept defines an independent set of ancestors from which all genes in an animal would have originated. A minimum estimate further was adjusted with an expected gene frequency among unknown ancestral genotypes. Expected gene frequencies depend on a probability some ancestral carriers are unknown and undetected. Example results are presented for recessive genes effecting abnormal phenotypes, Rectal-Vaginal Constriction and Limber Leg in the Jersey breed. Monitoring the occurrence of undesirable phenotypes caused by a recessive gene can facilitate development of breeding policies useful to breed improvement. Continuous and reliable reporting of abnormal progeny from identified parents is essential.

¹ Approved as Journal Article No. 4-81, The Ohio Agricultural Research and Development Center, Wooster.