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 Lamberson, W. R.
Right arrow Articles by Long, T. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Lamberson, W. R.
Right arrow Articles by Long, T. E.

Journal of Animal Science, Vol 69, Issue 8 3129-3143, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Direct responses to selection for increased litter size, decreased age at puberty, or random selection following selection for ovulation rate in swine

W. R. Lamberson, R. K. Johnson, D. R. Zimmerman and T. E. Long
University of Nebraska, Lincoln 68583-0908.

Nine generations of selection for high ovulation rate were followed by two generations of random selection and then eight generations of selection for increased litter size at birth, decreased age at puberty, or continued random selection in the high ovulation rate line. A control line was maintained with random selection. Line means were regressed on generation number and on cumulative selection differentials to estimate responses to selection and realized heritabilities. Genetic parameters also were estimated by mixed-model procedures, and genetic trends were estimated with an animal model. Response to selection for ovulation rate was about 3.7 eggs. Response in litter size to selection for ovulation rate was .089 +/- .058 pigs per generation. Average differences between the high ovulation rate and control lines over generations 10 to 20 were 2.86 corpora lutea and .74 pigs (P less than .05). The regression estimate of total response to selection for litter size was 1.06 pigs per litter (P less than .01), and the realized heritability was .15 +/- .05. When the animal model was used, the estimate of response was .48 pigs per litter. Total response in litter size to selection for ovulation rate and then litter size was estimated to be 1.8 and 1.4 pigs by the two methods. Total response to selection for decreased age at puberty was estimated to be -15.7 d (P less than .01) when data were analyzed by regression (realized heritability of .25 +/- .05) and -17.1 d using the animal model. No changes in litter size occurred in the line selected for decreased age at puberty. Analyses by regression methods and mixed-model procedures gave similar estimates of responses and very similar estimates of heritabilities.


This article has been cited by other articles:


Home page
 J ANIM SCIHome page
A. Rosendo, T. Druet, J. Gogue, L. Canario, and J. P. Bidanel
Correlated responses for litter traits to six generations of selection for ovulation rate or prenatal survival in French Large White pigs
J Anim Sci, July 1, 2007; 85(7): 1615 - 1624.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
N. Imboonta, L. Rydhmer, and S. Tumwasorn
Genetic parameters for reproduction and production traits of Landrace sows in Thailand
J Anim Sci, January 1, 2007; 85(1): 53 - 59.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
H. Mesa, T. J. Safranski, K. M. Cammack, R. L. Weaber, and W. R. Lamberson
Genetic and phenotypic relationships of farrowing and weaning survival to birth and placental weights in pigs
J Anim Sci, January 1, 2006; 84(1): 32 - 40.
[Abstract] [Full Text] [PDF]

Home page
 GeneticsHome page
A. R. Caetano, R. K. Johnson, J. J. Ford, and D. Pomp
Microarray Profiling for Differential Gene Expression in Ovaries and Ovarian Follicles of Pigs Selected for Increased Ovulation Rate
Genetics, November 1, 2004; 168(3): 1529 - 1537.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
D. B. Petry and R. K. Johnson
Responses to 19 generations of litter size selection in the Nebraska Index line. I. Reproductive responses estimated in pure line and crossbred litters
J Anim Sci, April 1, 2004; 82(4): 1000 - 1006.
[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
H. Mesa, T. J. Safranski, R. K. Johnson, and W. R. Lamberson
Correlated response in placental efficiency in swine selected for an index of components of litter size
J Anim Sci, January 1, 2003; 81(1): 74 - 79.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
J. L. Noguera, L. Varona, D. Babot, and J. Estany
Multivariate analysis of litter size for multiple parities with production traits in pigs: II. Response to selection for litter size and correlated response to production traits
J Anim Sci, October 1, 2002; 80(10): 2548 - 2555.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1991 by the American Society of Animal Science.