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Abstract.
In the period of 2009-2014, LLC "Rudnichnoe" and LLC "Lipetsktptitsa" poultry farms had the studies conducted to consider the effect of various dosages of the "Cercas" silica-containing drug on the intensity of growth, the slaughter qualities of broiler chickens, the egg production of laying hens and the biophysical properties of eggs. It was found that this drug, when introduced into the diet, increased its usefulness and the digestibility of the main nutrients, resulting in the acceleration of live weight gain, improvement of the slaughter qualities of chickens, increase in the egg production and liveability of adult hens as well as in improvement of the biophysical properties of eggs.
The chickens of the experimental groups grew faster in comparison with the chickens of the control group: young chickens of the 1st test group - by 3.9%, of the 2nd test group - by 8.5% and of the 3rd test group - by 7.8%. With a slaughter yield of 72.6-72.9%, the yield of breast and thigh was higher by a reliable value in chickens of the 2nd and the 3rd test groups.
In laying hens that received a diet with silica-containing drug additives, in comparison with the hens of the control group, hen-housed and hen-day egg production was 1.6-4.6 and 1.6-3.9% higher, respectively. In the 3rd test group, in adult chickens that received the Cercas drug in addition to the main diet at a dose of 130 mg/kg of feed, the highest liveability (95.18%), hen-housed and hen-day egg production (312.17 and 327.98 eggs respectively), the average weight (65.71g) and the number of eggs of the highest and top categories (33.7%) were indicated. Feeding the "Cercas" drug contributed to an increase in the shell weight and density of eggs. In the 3rd test group, this figure was 1.089 g/cubic centimeter and was more than in the hens of the control group by 0.011 g/cubic centimeter (P≥0.999). The height of the egg white in the laying hens of the 2nd and the 3rd test groups was correspondingly higher than in the control group hens: in the 2nd test group it was 0.16 (P≥0.95), in the 3rd group - 0.37 mm (P≥0.999). The Haugh value in the 2nd and the 3rd test groups associated with the egg white...