МОРФОЛОГИЯ МЫШЕЧНОЙ ТКАНИ ЦЫПЛЯТ-БРОЙЛЕРОВ ПРИ ЗАМЕНЕ В КОРМЕ АНТИБИОТИКОВ НА БИОЛОГИЧЕСКИ АКТИВНУЮ ДОБАВКУ

Abstract

This paper discusses the outcomes of the production experiment carried out on one of the poultry farms in the Sverdlovsk Region and at the departments of the Ural State Agricultural University. The experiment was carried out on cross Ross-308 broiler chickens in the number of 80 female and 80 male chickens with an average live weight of 43 g. During the research, the chickens were housed in different cages; the experiment continued throughout the entire rearing period - 38 days. The control group formed of comparable chickens was fed with the basic diet used on the farm with the nutritional value required for this cross, and during rearing, from the 1st to 10th day, the Albac feed antibiotic (500 g per t) was administered; it was substituted with Fortrazin (600 g t) from the 11th to 30th day. From the first day of rearing to the end of fattening, the trial group received the basic diet but the antibiotic was substituted with an alternative safe growth promoter SafMannan in the amount of 0.5 kg per t of compound feed. Comparative zootechnical indices of the control and trial groups showed that the introduction of the SafMannan supplement into the compound feed did not affect the chicken survival rates, and had a promoting effect on the growth and development of broilers accompanied by live weight gains. Histological examination of the breast and thigh muscle groups of the control and trial chickens did not reveal any pathological processes neither with the addition of feed antibiotics or with the introduction of the biologically active supplement SafMannan; the muscle mass increased due to young un-differentiated muscle fibers that were in the process matu-ration, but the final differentiation of the entire muscle mass by the end of the technological cycle did not occur.