Effect of a multi-enzyme complex on morphometric and chemical parameters of carcasses of Ross 308 cross chickens

The dynamics of live weight growth, morphometric indices of carcasses, and chemical composition of muscles were studied on Ross 308 cross chickens up to 42 days of age raised on diets with increased fi content and inclusion of multi-enzyme complex of protease and xylanase. Experimental studies were carried out in the feeding department of FSC ARRTPI, and vivarium of GSC “Zagorskoe EBFˮ, and morphometric and chemical parameters were determined at the Department of Veterinary Medicine of the Peoples’ Friendship University of Russia. When broilers reached the age of 28, 35, and 42 days, 3 chickens from each age group were slaughtered. Day-old chicks served as starting material. At the end of the growing period, the live weight of birds was determined, slaughtered, and morphometric indices of carcasses were studied; superficial pectoral muscles were subjected to histological studies, and shin muscles were subjected to chemical studies. Live weight of chickens from the control group reached 2432 ± 38.3 g by 42 days of age, experimental chickens - 2556 ± 28.5 g, at p ≤ 0.05 with a difference of 124 g, or more by 4.85%, carcass weight - 1778 and 1870 g respectively, with a difference of 4.20% ( p ≤ 0.05). On the 42nd day, the thoracic part of the carcass is 35.19…36.39%, increasing with age - by 1.20%, and the relative mass of the femoral part decreased by 0.68%, the tibia - by 0.72%. Pectoral muscles increased in: protein content - by 22.10%, fat - by 1.89%, and moisture - by 6.15%. The experimental group of chickens showed an increase in the diameter of muscle fi of superfi pectoral muscles by 42 days in 6.8 times. The structure of the muscle tissue of the superfi pectoral muscles was found to be disturbed at various stages.