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 Christian, R. E. Articles by Casida, L. E. Search for Related Content PubMed Articles by Christian, R. E. Articles by Casida, L. E.

The Response of Low-Fertility Cows to Insemination with Semen from Bulls of another Breed^{1, 2, 3,}

Department of Genetics, University of Wisconsin, Madison, and the Bureau of Dairy Industry, U.S.D.A.⁵

ABSTRACT

This study included 66 cows each of which had been bred four or more times previously without apparent conception. There was a distinct breed difference in conception rates; 35 per cent of the Holsteins and 8 per cent of the Guernseys had normal embryos.

There is no evidence from this study that inseminating with semen from bulls of another breed is beneficial in increasing conception rate in repeat-breeder cows. The unweighted percentage of cows with normal embryos was 28 in the control cows and 16 in the cross-mated cows.

¹ Paper no. 459 from the Department of Genetics, University of Wisconsin.

² This work was supported in part by grants from Badger Breeders Coop., Shawano, Wis.; Tri-State Breeders Coop., Westby, Wis.; Land O'Lakes Creameries, Herd Improvement Division, Minneapolis, Minn.

³ The authors are indebted to the following for aid in locating experimental animals for this study: Badger Breeders Coop., Shawano, Wis.; Tri-State Breeders Coop., Westby, Wis.; Dane County Coop., D.H.I.A., Madison, Wis.; Bock County Breeders Coop., Janesville, Wis.; Land O'Lakes Creameries, Herd Improvement Division, Minneapolis, Minn.

⁴ Agent of the Bureau of Dairy Industry, U.S.D.A.

⁵ This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Bureau of Dairy Industry, U.S.D.A. The funds contributed by the Bureau of Dairy Industry came as an allotment from the Research and Marketing Act.