The effectiveness of the complex use of pharmacological agents to preserve the bioresource potential of broiler chickens in conditions of overcompacted planting aggravated by high ambient temperature

Abstract

The aim of the work was to study the effectiveness of the use of pharmacological agents to preserve the bioresource potential of broiler chickens in conditions of overcrowded planting and high ambient temperature. The experimental bird of the Ross 308 cross was divided into 2 groups. The stocking density averaged 48.1 ± 1.8 kg/m2, the temperature in poultry houses was 27.1 ± 2.3 °C. Growing and fattening of poultry was carried out for 40 days. In the control group, broilers were not treated with pharmacological agents; in the experimental group, 6 days before slaughter, the method of pharmacological stress correction was used, which consisted of 3 successive stages: 1 preparatory stage - enrichment of the poultry diet with methionine by 10% compared to its initial content; potassium chloride at a dose of 0.3% and betaine at a dose of 10% of the total feed; stage 2 (increasing thermal stability) - 2 hours before the maximum recorded temperatures in the house with drinking water, broilers were given acetylsalicylic acid at a dose of 50-60 mg/kg of body weight; Stage 3 - compensatory, the implementation of which began in the evening, at the time of the temperature drop in the poultry house to the optimum, and consisting in drinking a water-soluble complex, at the rate of 195 mg per 1 kg of body weight. When applying this scheme, a decrease in the mortality of poultry during transportation by 31.5%, an increase in safety to 94.4%, and an increase in the proportion of carcasses of the 1st grade by 7.6% were noted. In the blood serum of broiler chickens of the experimental group, there was a significant increase in total protein by 17.1%, cholesterol by 13.8%, beta-lipoproteins by 23.8% and calcium by 12.3%. The meat of broiler chickens of the experimental group exceeded the control in protein content by 1.08%, tyrosine by 6.9%, threonine by 9.5, phenylalanine by 15.0, leucine and isoleucine by 13.7 and histidine by 34.5%.