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 Collins, W. E. Articles by Casida, L. E. Search for Related Content PubMed Articles by Collins, W. E. Articles by Casida, L. E.

Variation in Conception Rates of Guernsey Cattle¹

Division of Genetics and Department of Dairy Science, University of Wisconsin, Dairy Cattle Research Branch, USDA, Madison

ABSTRACT

Data from 42 Guernesy herds served by one A.I. stud, and 37 Guernsey herds served by another were analyzed to determine heritability of conception rate. The data included records of 2,470 daughters of bulls in these studs, and breedings occurred during the period of 1950 to 1959. Heritability estimates from intrasire correlations of paternal half-sib groups were 0.08 and 0.02 based on an average of from one to four records per daughter, while those based on heifer records only were 0.06 and zero, respectively. Regression of daughters on dams yielded heritability estimates of 0.03 and 0.10 for the two studs.

¹ Paper from the Division of Genetics No. 875 and the Department of Dairy Science, published with the approval of the Agricultural Experiment Station. This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Cattle Research Branch, USDA. It was supported in part by the Branch and in part by a grant from the Wisconsin-Minnesota Cooperative Bull Studs.

² Agent of the Dairy Cattle Research Branch, USDA.