JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 42 No. 3 543-544
© 1959 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Perkins, J. R.
Right arrow Articles by Seath, D. M.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Perkins, J. R.
Right arrow Articles by Seath, D. M.

Observations on the Estrous Cycles of Repeat-Breeding Dairy Heifers1

J. R. Perkins, Durward Olds and D. M. Seath

Animal Industry Group, Kentucky Agricultural Experiment Station, Lexington

ABSTRACT

The average duration of heat for 97 estrous periods of 17 repeat-breeding heifers was 19 ± 4 hr. Ovulation occurred 12 ± 3 hr. after the end of heat. Failure in ovulation occurred in 18% of the estrous cycles. The repeatability for duration of heat was about 16%, but the repeatability for time of ovulation was almost zero. There was no significant correlation between duration of heat and time of ovulation.

FOOTNOTES

1 The investigation reported in this paper is in connection with a project of the Kentucky Agricultural Experiment Station and is published by permission of the director.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1959 by the American Dairy Science Association ®.