МЯСНАЯ ПРОДУКТИВНОСТЬ ЦЫПЛЯТ-БРОЙЛЕРОВ ПРИ ВКЛЮЧЕНИИ В ИХ РАЦИОН ПРОБИОТИКА СУБ-ПРО

Abstract

The possibility of including SUB-PRO probiotic instead of Maxus G feed antibiotic in the diet of broiler chickens of Ross 308 cross was studied to obtain products free of drugs for antimicrobial resistance usage. The dynamics of live weight and carcass weight of cockerels at 1-, 21-, 28-, 34-, 38- and 42-days old was determined. The males of the control group (group 1) reached live weight of 2619 ± 44.9, experimental - 2739 ± 46.2 or more by 4.38%, at P≤0.05 by 42 days of age, and those which received feed antibiotic ( group 3) - 2677 ± 45.1 (further, meat productivity of the latter was not studied, since they are not of practical importance). The mass of carcasses of the experimental group was equal to 1704 ± 23.1 g, which is 4.60% more than the control, at P≤0.05; the relative mass of muscle tissue increased with age by 10.78% in the experimental group in comparison with the 1-day -olds, in the control group - by 10.0%, whereas the mass of bones decreased by 16.75 and 16.59%, respectively (by the difference); the diameter of muscle fibers of superficial pectoral muscle of 42-day-old broilers of the experimental group increased with age by 6.94 times and amounted to 57.9 μm; in terms of microbiological parameters, carcass meat meets the requirements of the interstate standard GOST 31468—2012. At the age of 42 days, cockerels of the control group showed dystrophic changes in the superficial pectoral muscle in the form of an expansion of the endomysium diameter, with the accumulation of interfiber fluid (albuminous degeneration), while some cockerels of the experimental group have fibers with vacuoles and infiltration by immunocompetent cells (leukocytes, phagocytes). Adding SUB-PRO probiotic in the broilers’ diet instead of the feed antibiotic does not reduce productivity, but excludes the negative consequences of feed antibiotics.