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In recent years, many countries worldwide have been revising the existing standards for introducing trace elements in mixed feed for high-performance crosses and poultry breeds, taking into account new scientific data. This also applies to Selenium, which is recognized as an indispensable biotic ultramicroelement according to the modern classification. The norms for introducing selenium into mixed feed for broiler chickens have specific differences and range from 0.1 to 0.5 mg/kg of feed, which are recommended in different countries and at other times. The reason for the disagreement is probably that the experiments were conducted under different conditions, against the background of different diets, on different poultry crosses, and using other selenium-containing compounds. In addition, the norms of selenium additives recommended by foreign and domestic scientists in mixed feed for broiler chickens are not always supported by mathematical calculations, and, in our opinion, they should be evaluated as indicative, requiring further justification and clarification depending on the regional characteristics of poultry feeding. Two scientific and economic experiments were conducted to determine the optimal rate of introducing selenium into mixed feed for broiler chickens, which lasted 42 days each. The study was conducted on broiler chickens of the Coob 500 cross. Selenium was additionally introduced into mixed feeds for broiler chickens of the experimental groups in doses of 0.2, 0.3, 0.4, and 0.5 mg/kg. Poultry in the control group did not receive Selenium supplementation. Statistical processing of experimental data obtained in two scientific and economic experiments, using graphical, variance, and regression analysis methods, allows us to conclude that the optimal dose of Selenium administration in mixed feed for broiler chickens should be considered 0.3 mg/kg. Feeding broiler chickens during the growing period of mixed feed enriched with Selenium in this amount contributed to a likely increase in their live weight in the first experiment by 7.8 % (Р < 0.001), in the second by 5.1 % (Р < 0.01), compared to the control group. Higher doses of Selenium (0.4 and 0.5 mg/kg) in mixed feed, as well as a lower dose (0.2 mg/kg), caused less intensive growth and lower live weight of broiler chickens of other experimental groups, compared to young animals fed mixed feed with the addition of selenium 0.3 mg/kg. [ABSTRACT FROM AUTHOR]

We studied the possibility of fortification of goslings' products with lithium and peculiarities of its depositing in the organs and tissues of goslings concerning lithium level in the mixed feed. Experimental studies have been conducted on goose breed Legart. A total of 320 one-day-old goslings were divided on the principle of analogues into four groups and 80 heads each. The goslings of the first control group did not receive the lithium supplement with the feed mix. Experimental groups were fed with the feed mixed that additionally was supplemented with different doses of lithium by the scheme of the experiment. After 70 days of rearing, three birds were randomly selected from each group and their control slaughter. The lithium content in the representative samples of muscle tissue and organs of goslings was determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). It was established that feeding the growing goslings with mixed feed containing lithium supplements in doses of 0.05, 0.1 and 0.15 mg/kg, contributed to the increase (P < 0.001) of the concentration of this trace element in the muscles of the thigh and drumstick accordingly 789.5, 1589.5 and at 3447.4 %, in the muscles of the breast 1096.8, 2080.6 and at 3948.4 %, liver are 455.4, 824.6 and at 1440.8 % are compared to goslings that did not receive lithium supplements. Significantly high values of lithium accumulation factors in organs and tissues of gosling (3.21-14.44) indicated that this element has a substantial accumulating capacity. The meat of goslings enriched with lithium can be considered as a natural product with bio-corrective action that can be used in human nutrition. These meat products can be particularly useful for people that are living in regions with a low environmental level of lithium. [ABSTRACT FROM AUTHOR]

The results of the production approval fully confirmed the high efficiency of introducing the feed additive "Butaselmevit-plus" into the compound feed for piglets. It was established that at the end of the piglet rearing period (at the age of 75 days), the average weight of one head in the experimental group was 32.6 kg, which is 1.1 kilograms or 3.5% higher (P < 0.05). Then their peers from the control group. During the period of rearing, the absolute increase in body weight in young animals of the experimental group was higher by 1.2 kg, or by 4.7 %, and the average daily weight gain by 21.8 g, or by 4.7 %, compared to similar indicators in piglets of the control group, and were 26.5 kg and 481.8 g, respectively. Among the numerous indicators determining the economic efficiency of production, the cost per unit of production is considered the most important. One of the reserves for reducing the cost of pig production is increasing young animals' productivity and preservation. The above results of the production inspection convincingly prove that using the feed additive "Butaselmevit-plus" in compound feed for piglets at the rate of 100 mg/kg of body weight increases their product qualities and, as a result, improves economic indicators. In the experimental group, the cost of 1 kg of live weight of piglets during rearing decreased by UAH 0.57, or 3.0 %, compared to the young of the control group and amounted to UAH 18.25. The cost of 1 kg of live weight gain in control and experimental groups was slightly higher (23.44 and 22.46 UAH, respectively), and the difference in favor of the latter was 4.2 %. The decrease in the unit cost of production in the experimental group was due to the increase in body weight and the survival of young pigs during the rearing period. The economic effect of using the feed additive "Butaselmevit-plus" as part of compound feed, calculated per 1 head of young pigs, was UAH 25.97 at the prices set for feed and feed additive in 2019. To increase the adaptability of piglets at an early age when weaning from the sow and to prevent the development of oxidative stress, for further maintenance during the period of rearing and fattening, it is recommended to use the feed additive "Butaselmevit-plus" in the amount of 100 mg/kg of body weight per day together with concentrates diet in the period from 21 to 40 days of age. [ABSTRACT FROM AUTHOR]