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 Pariacote, F.
Right arrow Articles by MacNeil, M. D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Pariacote, F.
Right arrow Articles by MacNeil, M. D.

Journal of Animal Science, Vol 76, Issue 5 1303-1310, Copyright © 1998 by American Society of Animal Science

JOURNAL ARTICLE

Effects of inbreeding and heterozygosity on preweaning traits in a closed population of Herefords under selection

F. Pariacote, L. D. Van Vleck and M. D. MacNeil
UNEFM, Departamento de Produccion Animal, Coro, Venezuela.

Records of five inbred lines at the Livestock and Range Research Laboratory were used to evaluate effects of inbreeding and heterozygosity on preweaning traits. Members of each line were descendants of a single founder Hereford bull. A total of 8,065 records of birth weight and 7,380 records of preweaning daily gain and weaning weight were analyzed by derivative-free REML using a model that included fixed effects of sex, combination of year and month of birth and parity of dam, with covariates for direct and maternal genetic fractions of inheritance from the genetic groups, inbreeding, and heterozygosity fractions. Heterozygosity fractions were computed for crosses between lines. The random model effects were direct and maternal genetic and uncorrelated maternal permanent environmental and temporary environmental. Direct inbreeding and heterozygosity fractions averaged .098 and .343, and maternal inbreeding and heterozygosity fractions averaged .075 and .294. Regression coefficients of traits on direct and maternal inbreeding fractions were -5.8 +/- 1.1 and -4.7 +/- 1.3 for birth weight, -.189 +/- .031 and -.252 +/- .039 for preweaning daily gain, and -44.5 +/- 6.6 and -56.1 +/- 8.4 kg for weaning weight. Estimates for direct heritability, maternal heritability, and direct-maternal genetic correlations were .37, .12, and -.01 for birth weight; .16, .25, and -.27 for daily gain; and .17, .26, and -.21 for weaning weight. Results suggest that heterosis represents recovery of accumulated inbreeding depression. Results also indicate that selection can overcome inbreeding depression and antagonism exists between direct and maternal genetic effects for preweaning traits.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
M. D. MacNeil
Invited Review: Research contributions from seventy-five years of breeding Line 1 Hereford cattle at Miles City, Montana
J Anim Sci, August 1, 2009; 87(8): 2489 - 2501.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
J. Casellas, J. Piedrafita, G. Caja, and L. Varona
Analysis of founder-specific inbreeding depression on birth weight in Ripollesa lambs
J Anim Sci, January 1, 2009; 87(1): 72 - 79.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
S. Mc Parland, J. F. Kearney, D. E. MacHugh, and D. P. Berry
Inbreeding effects on postweaning production traits, conformation, and calving performance in Irish beef cattle
J Anim Sci, December 1, 2008; 86(12): 3338 - 3347.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1998 by the American Society of Animal Science.