HISTOMETRIC INVESTIGATION OF THE BREAST M USCLE OF LAYING AND MEAT GENOTYPE IN THE COURSE OF GAINING WEIGHT

The histometric structure of the M. pectoralis spf. was investigated o f male meat and lying genotyp chicken in the course of growth io 17.th week. With the employment oi the automatic picture analysis system CB A 8000 it was feseable to measure quickly and objectively the cross-se ctional area (mu m(2)), the circumference (mu m), the circle-diameter (mu m) and the shapefactor of the muscle fibres. With help of the shap efactor, the mean cross-sectional area (mu m(2)) and their standard de viation giant fibres-parameter could be constructed which made possibl e an objective detection of the giant Fibres. The meat-genotyps were a bsolutely superior to the laying genotyps in all classic histometric p arameters. The cross-sectional area of the meat-genotyp was 354 mu m(2 ) greater than the laying genotyp and the percentage content of the gi ant fibres is within the meat genotyp greater than in laying genotyp. Based on the extrem different body weight evolution of the two genotyp s the giant fibres could be interpreted as an indicator of a disarrang ed metabolism of the sceletal muscle.