RELATIONS BETWEEN THE MUSCLE-FAT-GROWTH A ND 17-BETA-ESTRADIOL-PROGESTERONE-CONCENTRATION OVULATION POTENCY AND REPRODUCTION PERFORMANCE INGILTS

At 95 mature female pigs with different muscle-fat-relation (LSQ) the 17 beta-estradiol and progesterone were analyzed by radioimmunoassay ( RIA) in follicular fluid, m. glutaeus medius and backfat. Samples were taken after slaughtering. The ovaries and follicles were inspected. I n second part of research in 136 gilts the correlation between the mus cle fat-relation and reproductive performance were analyzed. Gilts wit h some more fat in their body have higher concentrations of 17 beta-es tradiol in follicular fluid and in fat. Especially in prooestrous/oest rus a positive correlation is found between muscle-fat-relation and ho rmone concentration. A correlation not exist between body fat and prog esterone concentrations in muscle and follicular fluid. Gilts with som e more backfat show a higher ovarian activity with more follicles. The limit for muscle-fat relation amount to 0.26. Gilts with some higher muscle-fat-relation have a better reproduction performance than gilts with a small fat portion in their body.