Selection of Pannon White rabbits based on computerised tomography.

This presentation reviews the selection procedure performed in the last years. From the population (n=12871) with 42.1 g/day average body weight gain between 5 and 10 weeks of age, the rabbits with higher daily weight gain (females: 45.0 g/day /n=1748/, males: 47.6 g/day /n=1179/) were chosen, thereafter CT (computerised tomography) scanning was performed at 10.5 weeks of age. Based on the scans located between the 2nd and 3rd, as well as between the 4th and 5th lumbar vertebrae, the cross-sectional area of the m. Longissimus dorsi was measured and the average of the two values was calculated (L value). A linear regression equation between the body weight and L-value was developed, and rabbits with the highest values above the regression line were selected. The L value of the selected animals exceeded the population average by 1 and 1.8 cm in female and male rabbits, respectively. Evaluated with REML the heritability (h2) and common litter effect (c2) of L-value were 0.41 (0.03) and 0.12 (0.01) respectively. Applying BLUP genetic merit of L-value showed an increasing trend for the whole investigation period.