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The article deals with the influence of Farmazin® and Tilocyclinvet® on the microbiological, chemical and microscopic characteristics of slaughtering products of broiler chickens. We have been studied the histological changes in the internal organs of broiler chickens under the influence of antibacterial drugs usage. Use of Farmazin and Tilocyclinvet as the antibacterial drugs for broiler chickens did not affect the microflora in the studied samples of poultry meat. We also investigated the microbiological parameters such as mesophilic aerobic and facultative anaerobic microorganisms, Escherichia coli bacteria, Proteus, Salmonella, Listeria monocytogenes, and Staphylococcus aureus bacteria and proved that Farmazin is mostly accumulated in «white» muscle, while Tilocyclinvet – in “red” ones. Results of the chemical analysis shown that the pH of meat in the bird groups that were fed on Farmazin (experimental I), Tilocyclinvet (experimental II) and control groups ranged from 5.64 ± 0.04 to 6.30 ± 0.03. We performed some tests concerning fresh meat and copper sulfate, peroxidase, ammonia and ammonium salts and suggested that meat of broiler chickens from the experimental and control groups con be preserved when refrigerated for three days and it is considered to be fresh. However, on the day 4 of storage pH value of chicken meat in the experimental group increases in the alkaline side; the results of reaction with copper sulfate, ammonium salts, ammonia, and ammonium salts testified the questionable freshness of meat from the experimental group at the end of the withdrawal period. We founded that pH value of broiler chicken meat from experimental group after withdrawal period shifts into the alkaline side comparing to the beginning of withdrawal period. We also registered that pH value of broiler chicken meat from experimental groups shifts into the alkaline side compared to control. Based on histological studies we can say that pathological changes registered in the internal organs of broiler chickens when using Farmazin and Tilocyclinvet were similar to each other and indicated some specific processes. We founded granular and fatty degeneration of hepatocytes, interstitial lymphocytic hepatitis, and fibrosis in the liver of broiler chickens; granular dystrophy of epithelial tubules, diffuse interstitial lymphocytic nephritis, and fibrosis – in kidneys; we also discovered swelling of intramuscular connective tissue and myocardial sclerosis in myocardium. The most obvious pathological changes were observed in broiler chickens, who were fed with Farmazin, somewhat less – in chickens who had got Tilocyclinvet at the beginning of the withdrawal period.

Вплив фармазину і тилоциклінвету на мікробіологічні, хімічні та мікроскопічні показники продуктів забою курчат-бройлерів