The search for elements of technologies and preparations of natural origin that improve the functioning of the gastrointestinal tract of animals is relevant given that intensive growing technologies involve the use of a significant amount of various kinds of antibiotics that reduce immunity and negatively affect the quality of meat products. Preparations developed on the basis of biologically active substances from essential oils of medicinal and spicy-aromatic plants are promising in this area. The studies used the dietary supplement Activo, recommended for feeding poultry and pigs, created on the basis of essential oils of rosemary, oregano, and thyme. That is why the purpose of the study was to find out the effectiveness and safety of using dietary supplements as an element of intensive rabbit meat production. Research methods – zootechnical, laboratory, statistical. For intensive fattening of young rabbits of the newly created chinchilla type, a mixed feed recipe based on local feed ingredients was developed. It was established that with the addition of Activo to the diet of fattening young rabbits in the amount of 100, 150, and 200 g/t, their productivity at 90 days of age increased, in particular, live weight – by 2.4-5.3%, average daily growth – by 3.5-6.4%, lifetime loin width (meatiness index) by 2.0-2.4%, feed conversion improved by 4.1-5.6%. It is shown that the use of dietary supplements in the amount of 150-200 g/t of mixed feed in the diets of young rabbits with intensive production of rabbit meat reduces direct costs for the production of 1 tonne of rabbit meat by UAH 2,200 and increases the profitability of production by 5%. Thus, the use of a biological additive as an element of intensive fattening of young rabbits helps to improve the lifetime meat content and slaughter yield of young rabbits while reducing the cost of finished feed and increasing its conversion, which leads to a decrease in direct production costs
Analysis of the effectiveness of evaluating inline and inter-line variants of combinations by type and finding their best variants in practical selective breeding is a relevant task that allows obtaining offspring of the desired quality. The purpose of this study is to figure out the specific features of the body structure of the firstborn cows of the Ukrainian blackspotted dairy breed of the western inbred type, depending on their origin, as well as to establish the type of inheritance of these indicators in line crosses based on the results of the evaluation by type. The study found the types of selection through genealogical analysis of pedigrees, linear evaluation of cows by type according to two evaluation systems – linear description of individual articles of the exterior on a 9-point scale and evaluation of complexes of exterior features of the animal type on a 100-point scale, obtained results were evaluated according to Student’s t-test. Using the scheme, it was found that the firstborn cows obtained as a result of the inline selection are characterized by optimal scores by type. However, animals from the Valianta 1650414 line received the highest ratings for linear traits of height at the withers, width of chest and rear, body depth. The study analysed the evaluation of firstborn cows by type, obtained in the interline selection, and it was found that the indicators of linear evaluation by type of cross lines correspond to and prevail over the average values for the breed. Cross cows ♂Valianta 1650414 x ♀Eleveishna 1491007 received the highest score for milk type on a 100-point scale. It was proved that most of the evaluated traits in line crosses were inherited according to the intermediate type. However, in the cross ♂Chifa 1427381 x ♀Eleveishna 1491007, the evaluation of individual traits (height, chest width, angle of withers, rear attachment, and depth of udder) statistically probably exceeded the values of the corresponding evaluations of the firstborns of the paternal and maternal lines, and the dominance of the maternal line was observed in the cross-breed cows ♂Chifa 1427381 x ♀Valianta 1650414 according to the value of the assessment of individual udder traits. The obtained results will allow performing optimal selection of parent pairs from animals evaluated by type for selection and breeding work with cattle herds to consolidate them by type
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