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 Ferraz, J. B.
Right arrow Articles by Johnson, R. K.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Ferraz, J. B.
Right arrow Articles by Johnson, R. K.

Journal of Animal Science, Vol 71, Issue 4 850-858, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Animal model estimation of genetic parameters and response to selection for litter size and weight, growth, and backfat in closed seedstock populations of large white and Landrace swine

J. B. Ferraz and R. K. Johnson
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.

Records from 2,495 litters and 14,605 Landrace and Large White pigs from two farms, but established from the same base population and run as replicated selection lines, were analyzed. Selection within herd was on estimated breeding values weighted by economic values. Animal models and REML procedures were used to estimate genetic, phenotypic, and environmental parameters for the number of pigs born alive (NBA), litter weight at 21 d (LW), average daily gain form approximately 30 to 104 kg (ADG), and backfat thickness adjusted to 104 kg (BF). Random animal genetic effects (o), permanent (NBA and LW) or litter (ADG and BF) environmental effects, maternal genetic effects (m), and the covariance between o and m were sequentially added to the model. Estimates of total heritability calculated from all data (ht2 = sigma o2 + 1/2 sigma m2 + 3/2 sigma om) ranged from .01 to .14 for NBA, from .18 to .22 for LW, from .23 to .34 for ADG, and from .40 to .50 for BF. Maternal genetic variance was from 2.4 to 3.8% of phenotypic variance in NBA, from 1.2 to 3.6% in LW, from .5 to 1.5% in ADG, and from 1.9 to 3.4% in BF. The correlation between o and m was -.07 for NBA, -.25 for LW, -.34 for ADG, and -.26 for BF. Permanent environmental effects explained from 16 to 17% of total phenotypic variation for NBA and from 1.6 to 5.3% for LW. Approximately 7% of the variation in ADG and 5% in BF was due to litter environmental effects.(ABSTRACT TRUNCATED AT 250 WORDS)


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
Z. B. Johnson and R. A. Nugent III
Heritability of body length and measures of body density and their relationship to backfat thickness and loin muscle area in swine
J Anim Sci, August 1, 2003; 81(8): 1943 - 1949.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
J. W. Holl and O. W. Robison
Results from nine generations of selection for increased litter size in swine
J Anim Sci, March 1, 2003; 81(3): 624 - 629.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
P. Chen, T. J. Baas, J. W. Mabry, K. J. Koehler, and J. C. M. Dekkers
Genetic parameters and trends for litter traits in U.S. Yorkshire, Duroc, Hampshire, and Landrace pigs
J Anim Sci, January 1, 2003; 81(1): 46 - 53.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
P. Chen, T. J. Baas, J. W. Mabry, J. C. M. Dekkers, and K. J. Koehler
Genetic parameters and trends for lean growth rate and its components in U.S. Yorkshire, Duroc, Hampshire, and Landrace pigs
J Anim Sci, August 1, 2002; 80(8): 2062 - 2070.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1993 by the American Society of Animal Science.