The purpose of the research was to study the growth and development of the
replacement young chickens of the parent herd of meat production and compare the
effectiveness of the use of two complex feed additives Sorbitox and Probitox.
When rearing the replacement young chickens of the cross Ross-308, the use of
feed additive Sorbitox at a dose of 0,50 kg/t of feed made it possible to obtain
in comparison with the control group the livability of livestock higher by 1,5
abs.%, with a similar dosage of Probitox additive by 2,1 abs.%. Analysis of the
causes of culling of the replacement young chickens showed that the use of
Sorbitox and Probitox additives reduced culling after two weeks of age, while in
the control group it was observed throughout the entire rearing period. The
average live weight of poultry of the control and experimental groups at 18
weeks of age had no significant differences, but at the same time the uniformity
of the group with Probitox additive exceeded the control by 8,7 abs.%, with
Sorbitox by 5,3 abs.%. Analysis of the development of the main organs and
departments of the gastrointestinal tract showed that the studied feed additives
stimulated the development of the liver, heart, muscular stomach, intestines.
The weight of the ovary and the length of the oviducts in the group of chickens
receiving Sorbitox exceeded the control group by 20,3 and 9,7 %, with Probitox
the difference was 27,8 and 11,4 %. Feed additives of sorption and probiotic
action in the body of poultry stimulated metabolism of an anabolic nature. In
the blood of the chickens receiving Sorbitox, the total protein was by 4,5 %
higher than the control group, with Probitox by 5,6 %. At the same time, the
level of urea decreased by 26,0 and 33,1 %. The highest glucose content was in
the blood of poultry receiving Probitox additive (12,5 mmol/l), which exceeded
the control group by 20,7 %, in the group with Sorbitox the difference was 7,3
%. The tested feed additives contributed to a greater retention of calcium in
the poultry body, and also reduced expenditures of feed for rearing replacement
young chickens. The use of Sorbitox additive reduced expenditures of feed by 6,9
%, and Probitox by 12,8 %.
