J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

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 Similar articles in PubMed
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 Werth, L. A.
Right arrow Articles by Kinder, J. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Werth, L. A.
Right arrow Articles by Kinder, J. E.

Journal of Animal Science, Vol 74, Issue 3 593-596, Copyright © 1996 by American Society of Animal Science

JOURNAL ARTICLE

Calving intervals in beef cows at 2, 3, and 4 years of age when breeding is not restricted after calving

L. A. Werth, S. M. Azzam and J. E. Kinder
Department of Animal Science, University of Nebraska, Lincoln 68583-0908, USA.

The objective of this study was to evaluate calving intervals and repeatability of calving intervals of young beef cows when breeding seasons were initiated immediately after calving. Average calving date at 2, 3, and 4 yr of age was recorded, and duration of calving interval between the first and second and second and third parities was compared in 178 crossbred beef cows calving between 1981 and 1988. Cows were placed in paddocks with intact bulls immediately after calving so they had the opportunity to conceive at the estrus associated with the initial estrous cycles after calving. Average Gregorian date of calving for cows was progressively earlier with older age (March 9, March 5, and February 14 at 2, 3, and 4) yr of age, respectively). Repeatability of calving intervals within individual cows was also evaluated. There was an interaction between year and parity on calving interval between 2 and 3 (P < .001) and 3 and 4 (P < .004) yr of age. Repeatability of calving interval was low and negative during 5 of the 6 yr. In young beef cows, year and parity interact to influence calving interval, and this average interval is less than 365 d when initiation of the breeding season is not restricted after calving.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1996 by the American Society of Animal Science.