Evaluation of responses to selection and association among specific traits in three populations of swine Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gm80hz547

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  • Oregon State University swine herd records of 456 litters farrowed between 1962-73 in three populations were analyzed on a generation basis to compare changes in performance of a Composite population to parental Berkshire and Yorkshire breeds. Analysis was performed in six discrete and overlapping generations on backfat thickness, loin eye area and litter size (number born alive and dead); litter size was the primary trait of emphasis in the selection scheme. Phenotypic correlations adjusted for different environmental effects were estimated along with heritability for the traits considered. Phenotypic correlation between backfat thickness and loin eye area was moderate and showed a negative trend in both parental and Composite populations. Correlations between litter size and loin eye area or backfat thickness were not consistent; litter size had, where significant, a moderate negative association with loin eye area. The phenotypic correlation between litter size and backfat thickness was non-significant. The increased number of pigs born to Composite dams over parental Yorkshire and Berkshire dams, was significant only in earlier generations. The differences among the breeds for backfat thickness and loin eye area in the generations were small and mostly non-significant. Heritability estimates for each of the three traits in each of the three populations were within the usual values found in other studies and they indicate positive response in relation to selection differentials. Among other possible explanations for similarity of responses within each of the three populations is the long history of coadapted direction of selection in the populations used.
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