A study was conducted to evaluate response to selection for intramuscular fat (IMF) in Duroc swine using real-time ultrasound. Within each of four generations, breeding values were estimated for predicted and carcass IMF by fitting a two-trait animal model, and selection was based on EBV for carcass IMF. After four generations of selection for IMF, the average EBV for select line pigs is 1.03% greater than for control line pigs. Selection for IMF has, however, resulted in slightly more backfat and less loin muscle area, and yielded no significant response in growth. A correlated response in terms of less desirable objective measures of color was found after four generations of selection; however, no other objective meat quality differences were found between the select and control lines. No correlated responses in any measures of eating quality were detected after four generations of selection for IMF.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.14, 2006
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