Degree Type

Thesis

Date of Award

2007

Degree Name

Master of Science

Department

Animal Science

First Advisor

Tom Baas

Abstract

Data from 5 generations of a selection project for increased intramuscular fat (IMF) in the longissimus dorsi in purebred Durocs were used to determine the correlated response in litter traits to selection for intramuscular fat and to estimate genetic parameters for litter traits and predicted intramuscular fat. The correlated response in litter traits showed that selection of pigs only for IMF would result in a decrease in the maternal performance of females, along with reduced production performance of their progeny. Significant differences were found between lines for litter birth weight (LBW) and average piglet birth weight (ABW), with dams in the control line (CL) farrowing litters and piglets that were heavier at birth. Differences between the CL and SL were not significant for remaining litter traits. Moderate heritability estimates were found for TNB, NBA, LBW, NW, and LWW. Predicted intramuscular fat showed a high heritability (0.85).

DOI

https://doi.org/10.31274/rtd-180813-16240

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Ashley Lynn Bushman

Language

en

Proquest ID

AAI1447473

OCLC Number

213494953

ISBN

9780549333647

File Format

application/pdf

File Size

103 pages

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