Micromorphological features of the superficial pectoral muscle of Cobb-500 broiler chickens with different feeding diets

On the basis of complex morphological studies, a comparative characterization of light-optical, ultrastructural and morphometric parameters of superficial pectoral muscle in 35-day-old broiler chickens of meat cross Cobb-500 kept on different diets: basic and with the addition of feed additives (prebiotic, probiotic, sorbent) of domestic production is presented. It is shown that depending on the features of feeding ration in the superficial pectoral muscle varies the degree of development of muscle fibers and connective tissue component of the muscle, as well as the density of myofibrils packing and the development of mitochondrial network. Representatives of the cross Cobb-500 in the groups “Control”, “Prebiotic” and “Probiotic” have similar morphological and morphometric parameters of the superficial pectoral muscle. All three groups are characterized by dense packing of muscle fibers of the first order, which is associated with a small thickness of the endomysium. At the same time, the perimysium is well developed, which determines a rather loose arrangement of the second-order bundles. In the “Prebiotic” and “Probiotic” groups, compared to the control samples, the representation of large-diameter muscle fibers increased, which may indicate the synchronization of growth of different muscle fibers against the background of application of appropriate feed additives. In the “Sorbent” group, a pronounced decrease in the density of muscle fibers and their bundles in the muscle structure with a significant representation of connective tissue and a low content of white adipose tissue was determined. In this group, the signs that may indicate a delayed realization of growth processes in the muscle were revealed. The obtained data are expedient to be taken into account when formulating diets in industrial poultry farming. They can also be used as morphological criteria in assessing the quality of poultry meat during commodity and veterinarysanitary examination.

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