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As a result of the conducted comparative studies, it was found that in the process of fattening, the broiler chickens of the Cobb-500 and Ross-308 crosses met the standards of meat productivity grown in the conditions of feedlots on the territory of the Voronezh region. The results of fattening showed that Cobb-500 and Ross-308 cross broiler chickens had different indicators of live weight and, accordingly, the mass and yield of carcasses after primary processing as a result of slaughter. The live weight index of broiler chickens of the Ross-308 cross was 154.5 grams lower than that of the Cobb-500 cross, respectively, the mass of the unemboweled carcass after transportation by 208.5 grams, the mass of the gutted carcass by 178.7 grams. The slaughter yield of the unemboweled carcass was also 0.5% lower, and the gutted one by 1%. Individual anatomical parts of the carcasses of broiler chickens of the Cobb-500 cross exceeded the mass of individual anatomical parts obtained after cutting the Ross-308 cross. It was determined that broiler chickens of the Cobb-500 cross as a result of a more intensive increase in muscle mass under equal conditions compared with the Ross-308 cross with intensive metabolic processes in the body had lower safety indicators for the herd. It is determined that the Cobb-500 cross is more susceptible to the stressful effects of technological factors, for example, due to the increased temperature and humidity conditions of the room, noise, etc. Based on this, the bird at the final stage of fattening has more contact with the aggressive environment of the bedding material, i.e. spends more time sitting as a result of a heavy load of body weight on the joints of the legs. As a result, the case increases, the weight gain on the herd decreases, and the number of pathological processes of paws increases and, accordingly, their culling. As a result, it can be noted that broiler chickens of the Ross-308 cross are less susceptible to stressful production factors, and also have higher rates of preservation and slaughter yield of bird paws as a by-product, based on the fact that the number of defective products decreases
As a result of the conducted comparative studies, it was found that in the process of fattening, the broiler chickens of the Cobb-500 and Ross-308 crosses met the standards of meat productivity grown in the conditions of feedlots on the territory of the Voronezh region. The results of fattening showed that Cobb-500 and Ross-308 cross broiler chickens had different indicators of live weight and, accordingly, the mass and yield of carcasses after primary processing as a result of slaughter. The live weight index of broiler chickens of the Ross-308 cross was 154.5 grams lower than that of the Cobb-500 cross, respectively, the mass of the unemboweled carcass after transportation by 208.5 grams, the mass of the gutted carcass by 178.7 grams. The slaughter yield of the unemboweled carcass was also 0.5% lower, and the gutted one by 1%. Individual anatomical parts of the carcasses of broiler chickens of the Cobb-500 cross exceeded the mass of individual anatomical parts obtained after cutting the Ross-308 cross. It was determined that broiler chickens of the Cobb-500 cross as a result of a more intensive increase in muscle mass under equal conditions compared with the Ross-308 cross with intensive metabolic processes in the body had lower safety indicators for the herd. It is determined that the Cobb-500 cross is more susceptible to the stressful effects of technological factors, for example, due to the increased temperature and humidity conditions of the room, noise, etc. Based on this, the bird at the final stage of fattening has more contact with the aggressive environment of the bedding material, i.e. spends more time sitting as a result of a heavy load of body weight on the joints of the legs. As a result, the case increases, the weight gain on the herd decreases, and the number of pathological processes of paws increases and, accordingly, their culling. As a result, it can be noted that broiler chickens of the Ross-308 cross are less susceptible to stressful production factors, and also have higher rates of preservation and slaughter yield of bird paws as a by-product, based on the fact that the number of defective products decreases
Relevance. Studying the bacterial diversity of the intestine under the influence of various factors makes it possible to study changes in the qualitative and quantitative composition under the influence of various factors.Methods. In our work, we studied the bacterial profile of samples of the contents of the cecum of broiler chickens. To assess the effect of ultrafine particles of Cu and Fe on the metabolism in the body of animals fed a semi-synthetic diet, 120 heads of one-week-old broiler chickens were selected, which were divided into 4 groups (n = 30) using the analog pair method. During the experiment, all birds were under the same housing and feeding conditions. The duration of the experiment was 28 days. To solve the problems, broiler chickens were used, which were supplemented with ultrafine Cu and Fe particles in their diet in order to study their effect on the microbiocenosis of the poultry digestive system. Using the analogue pair method, four groups of 30 broiler chickens each at the age of 7 days were formed. During the study, housing and feeding conditions were identical for all groups. The study was conducted over 4 weeks. For feeding, we prepared a semi-synthetic diet (K1) and a semi-synthetic diet, deficient in microelements, modified by us (K2).Results. The use of ultrafine copper and iron particles has been shown to alter the intestinal bacterial community of broiler chickens. Thus, based on the data, we can conclude that obligate bacteria in the cecum of birds can modulate the level of accumulation of chemical elements in the bird’s body when various substances are introduced. According to the data obtained, ultrafine iron particles made it possible to maintain the normal diversity of the digestive microbiota of poultry, which was expressed, among other things, in a decrease in the number of representatives of the Enterobacteriaceae family, which includes representatives of pathogenic and opportunistic taxa, while the introduction of ultrafine copper particles contributed to an increase in the number of representatives of this family.
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