Correlated responses in reproductive and carcass traits to selection for 200-day weight in Duroc swine
Article Abstract:
Results of a study indicated that selection of single trait, for 200-day weight Duroc pigs results in animals that grow more rapidly. However, single-trait selection did not produce any long-term effect on reproductive traits. Several reproductive factors and carcass characteristics of Duroc pigs, selected for increased 200-day weight, were assessed. Reproductive characteristics included litter sizes born and surviving and weight of the off-springs. Carcass traits, such as average backfat thickness, carcass length and color and marbling evident in the longissimus muscle, were also assessed.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Correlated responses in reproductive and carcass traits to selection for 70-day weight in Landrace swine
Article Abstract:
Landrace pigs were farrowed, weaned then slaughtered after 70 days to obtain carcass characteristics, litter weight and size traits. Total weighted cumulative selection differentials (WCSD) after trait selection in the postweaning period was 30.2 kilograms with a significant realized heritability of 0.13 plus or minus 0.06. There was no muscle increase but there was improvement in lean tissue growth and carcass color. Thus, a single-trait selection for 70 day weight in pigs can be done and would produce larger 21 day litter sizes.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effect of culling on selection response using phenotypic selection or best linear unbiased prediction of breeding values in small, closed herds of swine
Article Abstract:
The effectiveness of culling based on estimated breeding value and best linear unbiased prediction (BLUP) of breeding values against phenotypic selection in small herds of swine was determined by computer simulation. Ten years of selection using 7,200 separate herds was covered. The use of BLUP and culling on estimated breeding values when a superior replacement was available were more effective than individual phenotypic selection. However, increased inbreeding should be anticipated and corrective measures undertaken.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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