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 Foote, R. H. Articles by Dunn, H. O. Search for Related Content PubMed Articles by Foote, R. H. Articles by Dunn, H. O.

Fertility of Bull Semen Stored Up to Four Days at 5° C. In 20% Egg Yolk Extenders

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

H. O. Dunn

New York Artificial Breeders' Cooperative, Inc., Ithaca, New York

ABSTRACT

Three fertility trials comparing experimental extenders CUE and CU-16 with a standard 50% egg yolk-citrate-sulfanilamide control were conducted in 1957 and 1958. Semen was extended to ten million motile spermatozoa per milliliter of extender in all trials. The first trial included four bulls, and the semen was used for insemination primarily one and two days after collection. A second field trial was designed to use semen extended with CUE and CU-16 more extensively three to four days after collection, and a third field trial, conducted on a larger scale, was designed to obtain results with all three extenders over a four-day storage period. The combined number of first services and weighted mean percentages of 60- to 90-day nonreturns for all three trials was 6,069 and 73.4 for the control 2.9 CSAY, 6,280 and 76.6 for the CUE, and 6,145 and 76.0 for the CU-16. The adoption of CUE for routine use by the local artificial breeding cooperative resulted in an immediate and consistent increase of about two percentage units, bringing the 60- to 90-day nonreturn rate to an average of 74.9% for nearly 300,000 first inseminations.

¹ Present address: Department of Dairy Science, Washington State University, Pullman.