Interrelationships between Backfat Thickness and Dissectable Carcass Lean and Fat in Indigenous Nigerian Pigs

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Backfat thickness measurements taken at four points -lst rib. 10th rib. last rib and last lumbar were obtained for 120 indigenous 'Nigerian (40 female. 40 castrated male and 40 intact male) pigs aged between 168 and 672 days and .weighing between 24.2 and 78.2 kg live weight. Ratios of backfat measurement taken at 672 days relative to 168 days indicated that growth in backfat was completed earlier at the lst rib than at the other points. Allometric coefficients (b) and coefficient of determination (R2) obtained by relating average backfat thickness to live weight were:l.OI4 and 0.9502; 0.628 and 0.8141; 1.047 and 0.8748 respectively in the female. castrated male and intact male pigs relatively. Total dissectible carcass lean and fat weights in the female and castrated male pigs relatively were best predicted by t ,e 10th rib backfat measurements as follows: Ie n (b = 0.713, R2 = 0.8845 and b = 0.688, R =0.8791), fat (b = 1.307, R2 =0.9512 and b =0.869, R2 =0.700). Backfat measurement at the last rib best predicted dissectible lean weight (b = 1.045, R2 =0.8983) and fat (b = 1.619, R2 =0.9813) in the castrated male pigs. . Relationships between intramuscular fat weight of three selected muscles and backfat thickness were highly positively linear (R2 = 0.9016 -0.9853) while average allometric growth coefficients b were 1.631, 1.566 and 1.401 for Mn bicepsjemoris, longissimus dorsi and triceps brachii respectively.
East African Agricultural And Forestry Journal, 60 (No. 1 & 2), p. 51-58