RELATIONS BETWEEN THE MUSCLE-GROWTH AND F AT-GROWTH AND THE CONCENTRATION OF 17-BETA-ESTRADIOL AND PROGESTERONE IN FOLLICULAR-FLUID, MUSCLEAND FAT IN FEMALE PIGS

In an experiment with 95 mature female pigs the concentrations of 17-b eta-estradiol and progesterone were analysed in follicular fluid, musc le and fat dependent on the backfat-thickness and the muscle-fat relat ionship. After slaughtering samples of follicular fluid, Musculus glut aeus medius and backfat were taken and analysed by radioimmunoassay (R IA). Female pigs with more fat in her body have a higher concentration of 17-beta-estradiol in follicular fluid and in fat. Especially in pr ooestrous/oestrous a positive correlation is found between the backfat -thickness or muscle-fat relationship and the concentration of 17-beta -estradiol in follicular fluid. The progesterone concentrations in bac kfat and in musculus glutaeus medius are not dependent on the body com position. Female pigs with more fat have an increasing progesterone co ncentration in follicular fluid during prooestrous/oestrous.