Feed phyto-additive from Leucea safflower (Rhaponticum carthamoides) and its use in young laying hens

The aim of the research was to study the content of 20-hydroxyecdysone in phyto-additive from Leucea safflower and its effect on metabolic processes in young laying hens of the Lohmann Brown Light cross. The concentration of 20-hydroxyecdysone in phyto-supplement under study was 0.40±0.05 % on absolutely dry matter. Phyto-additive from the green mass of Leucea safflower was included into the compound feed from the 2nd to the 23rd week of growing young laying hens: at a rate of 3,0 % in the first experimental group and 6,0 % in the second group, based on the dry matter content of the feed. The duration of feeding was 154 days. As a result of the experiment, it was revealed that the young laying hens of the first and second experimental groups had higher digestibility coefficients compared to the analogues of the control group: of dry matter by 3.20 and 7.21 % (p<0.01), of organic matter by 2.90 % (p><0.05) and 5.70 % (p><0.01), of crude protein – by 5.68 and 7.47 % (p><0.05), of crude fat – by 4.60 and 6.07 % (p><0.05), of crude fiber – by 4.94 and 8.14 % (p><0.05), and of nitrogen-free extractive substances – by 1.36 and 2.31 %, respectively. The coefficients of nitrogen assimilation in poultry of the experimental groups were higher by 1.89 р. р. (p><0.01) and 4.58 р. р. (p><0.001), respectively. In the young laying hens of the first and second experimental groups, the coefficients of calcium and phosphorus utilization were higher, compared with the poultry of the control group, by 1.42 р. р. (p><0.05) and by 3.57 р. р., 1.44 р. р. and 3.50 р. р., respectively. The level of total protein in the blood of young laying hens of the first and second experimental groups was at the upper limit of normal and was higher by 9.13 % (p><0.05) and 12.22 % (p><0.01), respectively, compared with the control. The live weight of young chickens in the first and second experimental groups at the end of the experiment, was 101.02 % and 105.52 %, respectively, relative to the control. In order to improve the metabolic processes in the body of the poultry, it is more appropriate to include a feed phyto-additive from Leucea safflower in the amount of 6.0 % (in% to the weight of the dry matter of the feed) in the structure of compound feeds for young laying hens. Keywords: compound feed, digestibility, phytoecdysteroids, balance of nitrogen, calcium, phosphorus, carotene, 20-hydroxyecdysone> < 0.01), of organic matter by 2.90 % (p < 0.05) and 5.70 % (p < 0.01), of crude protein – by 5.68 and 7.47 % (p < 0.05), of crude fat – by 4.60 and 6.07 % (p < 0.05), of crude fiber – by 4.94 and 8.14 % (p < 0.05), and of nitrogen-free extractive substances – by 1.36 and 2.31 %, respectively. The coefficients of nitrogen assimilation in poultry of the experimental groups were higher by 1.89 р. р. (p < 0.01) and 4.58 р. р. (p < 0.001), respectively. In the young laying hens of the first and second experimental groups, the coefficients of calcium and phosphorus utilization were higher, compared with the poultry of the control group, by 1.42 р. р. (p < 0.05) and by 3.57 р. р., 1.44 р. р. and 3.50 р. р., respectively. The level of total protein in the blood of young laying hens of the first and second experimental groups was at the upper limit of normal and was higher by 9.13 % (p < 0.05) and 12.22 % (p < 0.01), respectively, compared with the control. The live weight of young chickens in the first and second experimental groups at the end of the experiment, was 101.02 % and 105.52 %, respectively, relative to the control. In order to improve the metabolic processes in the body of the poultry, it is more appropriate to include a feed phyto-additive from Leucea safflower in the amount of 6.0 % (in% to the weight of the dry matter of the feed) in the structure of compound feeds for young laying hens.

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