Testing was performed on the effect of a final body weight in performance test on the thickness of the sidefat, backfat thickness and depth of musculuslongissimusdorsi (MLD) of Swedish Landrace boars. The study included 228 boars. Features included in the study were: fat thickness (S1), fat thickness (S2) and the depth of the of musculuslongissimusdorsi (MLD). Backfat thickness was 13,66mm, thickness of sidefat 13,2mm and average depth of MLD is 62,6mm. There was a statistically significant

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... ct on final body weight on investigated traits. There was also a significant correlation between the final body weight in the performance test on backfat thickness 0.35 (P <0.05); the thickness of the sidefat 00.25 (P <0.05) and the depth of the MLD 0.19 (P <0.05). In order to obtain a clearer picture of the impact of the final mass in the performance test, groups were formed: I (over 109kg); II (103-109kg); III (97 to 102.9 kg) and IV (less than 96.9 kg). First group established the maximum thickness of the backfat (15,95mm), a sidefat (14,92mm) and the depth of MLD was (68,57mm), while in group IV had minimum thickness of backfat (11,81mm), the thickness of the sidefat (11,14mm) and the depth of MLD (56,14mm). The difference in the average values of the examined traits between different weight groups was statistically significant (P <0.05). The results clearly show that the increase of the mass in performance test in Landrace boars, have positive corelation with the thickness of back and sidefat, with a small increase in the depth of MLD. These results clearly show that the increase of the final mass changes the meat-fat ratio in favor of fat, which affect the final assessment on breeding values of boars. Also, the results indicate that boars with a higher final weight at the end of the test, have lower values breeding values.