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Pietruszka A., A. Sosnowska: Effect of RYR1T Gene Polymorphism on the Initial Growth and Fattening and Slaughter Values of Polish Synthetic Line 990 Pigs Reared in Standardized Litters. Acta Vet. Brno 2008, 77: 217-224. The aim of this study was to determine the effect of the ryanodine receptor gene - RYR1 T rd (63BW) and 180 th (180BW) days of life. During evaluation, the live average daily gain (LADG) from birth to day 180 of life and the average daily gain (ADG) from day 63 to day 180 of life were determined. The percentage meat content (PMC), backfat thickness (BFT) and loin eye thickness (LET) was determined using PIGLOG 105 ultrasound apparatus. Two alleles of the RYR1 gene (RYR1C, RYR1T) and three genotypes (C/C, C/T and T/T) were identified. The 21BW and 28BW of the T/T genotype were significantly lower than that of the C/C and C/T. The highest PMC was characteristic of the T/T genotype, whereas the lowest one of the C/C genotype (p ≤ 0.05). The T/T genotype had a higher LET than the C/C genotype (p ≤ 0.05). No significant differences with respect to LADG, ADG and BFT between RYR1 genotypes were found. It can be stated that early identification of homozygous animals with respect to the RYR1 T gene may allow the prediction of the body weight of animals in the initial period of their rearing. RYR1 genotype, body weight, meatiness, gilts, barrows As generally known, piglets that are heavier on the day of birth are also stronger and grow better when compared to lighter piglets from the same litter. Heavier piglets distinguish themselves by a higher survival rate than lighter piglets (Hermesch et al. 2001). Furthermore, heavier piglets are characterised by a higher growth rate than lighter ones (Roehe 1999). The tendency to keeping a higher growth rate is also maintained after piglets have been weaned from a sow. The body weight of piglets on

acta veterinaria brno

Effect of RYR1T Gene Polymorphism on the Initial Growth and Fattening and Slaughter Values of Polish Synthetic Line 990 Pigs Reared in Standardized Litters