SUMMARY Direct response on restricted feeding and correlated response on full feeding to selection in performance and meat production traits of boars were compared and genetic and phenotypic parameters and genotype by feeding interaction were estimated for Landrace pigs Index selection for daily gain, backfet thickness and eye muscle area were conducted for boars on restricted and gilts on full feeding for six generation Data consisted of records from 291 candidate boars and 141 full sib boars Traits recorded in the performance test were age at end of the test (90AGE), average daily gain(DG), feed intake(FI), daily feed inlake(FID), feed conversion ratio (FCR), backfat thickness (BF) and eye muscle areafEM). The correlated responses in FID and DG on full feeding were greater than the direct response in these on restricted ff**ting phe estimates of heritability for performance traits (DG, FI, FID and FCR) were higher on full feeding than on restricted feeding The phenotypic and genetic correlations between DG and BF were positive on full feeding (0.213, 0.192), but almost null on restricted feeding (0.085,0.037). The phenotypic and genetic correlations between DG and FCR, DG and FI were larger on restricted feeding than on full feeding On the contrary, those between DG and FID were larger on full feeding than on restricted feeding. Genetic correlation between the feeding regimes for 90AGE (0.771) and FI (0.772) were both near 0.8 and that for DG was slightly lower (0.650) but it was almost null for FID (0.101). These results indicate that a selection system that boars were tested on a restricted feeding and gilts were tested on a full feeding might be effective in improving performance traits of pigs.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 679–682, 1998
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