V. TeuŞan

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RESEARCH ON THE THICKNESS AND PROFILE OF SUPERFICIAL PECTORAL MUSCLE MYOCYTES OF MEAT TYPE HYBRID COBB-500 SLAUGHTERED AT DIFFERENT AGES

V. Teuşan, Anca Prelipcean (Teuşan), A.A. Prelipcean

Abstract
From 30 chickens belonging to the avian hybrid COBB-500 slaughtered at the age of 35, 42 and 49 days, histological samples were collected from superficial pectoral muscle. Chickens body weight at slaughter was 1406 - 1614 grams, at 35 days was of 2168 to 2296 grams at 42 days and from 2350 to 2378 grams at 49 days. The histological samples collected were processed by paraffin technique stalk, finally resulting in 50 slides that were then studied with a binocular microscope photon MC3 type. We measured the microscopic field using a micrometer device, to determine the large and small diameters of about 500 muscle fibers. Average diameter, the index profile and index format for these muscle cells were determined by calculation. We obtained the following results: at the age of 35 days, the average diameter of the muscle fibers was 28.253 ± 0.59 µ, for males and 24.525 ± 0.53 µ for females. At the age of 42 days the muscle fibers had an average diameter of 34.745 µ, for males and one of 29.335 ± 0.55 µ for females. At the age of 49 days, the average diameter of myocytes in the studied muscle was 37.138 ± 0.74 µ, for males and 32.73 ± 0.75 µ, for females. The appearance of muscle fibers was cylindroids index profile with close values for the two sexes and for age categories (1.296/1 - 1.495/1) (69.77 - 79.72 %). The differences between males and females at all the ages of slaughter, for the average diameter are statistically significant.

Key words: myocytes, profile, superficial pectoral, avian