Abstract
Changes in live weight, morphology of carcasses, their morphometric parameters, chemical composition of muscles during cage rising (group 1) and ground-grazing raising (group 2) were studied in hens (Smena 9 cross) at the age of 1, 35, 42, 49 and 56 days. Generally accepted research methods were used. The hens were raised under the same conditions. The experiments revealed that chickens had a high growth rate at an early age. At 56-day age, live weight of hen from group 1 was 3438 g, which was 2.69 % less than in group 2, and carcass weight was 2.89 % less (P 0.05). In carcasses of broilers from group 2, weight of muscle tissue was 3.14 % more (P 0.05), however, fat and bones were less by 0.22 and 0.09 %, respectively. Compared to 1-day-old chickens, 56-day-old broilers had increased relative weight: muscle tissue in group 1 and group 2 - by 13.04 and 13.27 %, respectively; fat - by 4.02 and 3.80 %, respectively; while relative bone weight decreased by 16.25 and 16.34 % in group 1 and group 2, respectively. Ground-grazing raising of chickens is not inferior in meat productivity to cage rising. At the same time, veterinary and sanitary indicators differ in the quality of meat.
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