Correlated responses in chemical body composition, daily fat and protein deposition, protein 
conversion ratio from a line of Landrace pigs selected for daily gain, backfat thickness and eye muscle 
area were studied in 139 male pigs and correlations between these traits were estimated . Daily gain, daily 
feed intake and daily protein deposition increased by 21.82g/day, 0.05kg/day and 2.4g/day, respectively, 
per generation. Backfat thickness decreased by -0.04cm per generation. But total feed intake, the 
conversion ratio of feed and protein, chemical body fat and protein percentage didn't change. Daily 
protein deposition was highly correlated with daily gain and feed conversion ratio. On the other hand, 
protein conversion ratio was highly correlated with feed conversion ratio, total feed intake and backfat 
thickness.To improve not only daily protein depositon but also protein conversion ratio, daily gain, 
backfat thickness and feed conversion (or total feed intake) should be considered as selection traits.

K. Suzuki, S. Nishida, S. Ujiie

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 79–82, 1994
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