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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by MacNeil, M. D.
Right arrow Articles by Newman, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by MacNeil, M. D.
Right arrow Articles by Newman, S.

Journal of Animal Science, Vol 72, Issue 12 3073-3079, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Genetic analysis of calving date in Miles City Line 1 Hereford cattle

M. D. MacNeil and S. Newman
Fort Keogh Livestock and Range Research Laboratory, USDA, Miles City, MT 59301.

A model for genetic analysis of calving date was proposed and variance components, genetic trends, and fixed effects for calving date were estimated in the Miles City Line 1 Hereford cattle population. There were 951 pedigree records that predated 1935, when data collection began, and 4,692 subsequent recorded calving dates through 1989. The statistical model included fixed linear continuous effects for inbreeding of calf and inbreeding of dam, discrete fixed effects for year, sex of calf, and age and previous parity of dam, and random sources of variation for individual (calf) and maternal additive genetic effects, and environmental effects of dams, mating groups, and residuals. All effects were estimated simultaneously by derivative-free procedures for REML. Male calves were born 1.58 +/- .40 d later than female calves. Cows failing to wean a calf in the previous year calved 2.81 +/- .81 d earlier than cows that had weaned a calf. Other fixed effects were small. Variance components (d2) were 23.0 for individual additive genetic effects, 5.8 for maternal additive genetic effects, 9.2 for maternal permanent environmental effects, 11.8 for contemporary group effects, and 161.3 for residual effects. Environmental trend was +.17 d/yr and individual additive genetic trend was -.07 d/yr. No maternal additive genetic trend was detected. These results do not encourage the use of calving day as a selection criterion for improving fertility of beef cattle.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
D. H. Crews Jr.
Age of dam and sex of calf adjustments and genetic parameters for gestation length in Charolais cattle
J Anim Sci, January 1, 2006; 84(1): 25 - 31.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
M. E. Z. Mercadante, I. U. Packer, A. G. Razook, J. N. S. G. Cyrillo, and L. A. Figueiredo
Direct and correlated responses to selection for yearling weight onreproductive performance of Nelore cows
J Anim Sci, February 1, 2003; 81(2): 376 - 384.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1994 by the American Society of Animal Science.