This chapter reviews the main themes and issues in modelling the processes involved in feed intake in ruminants. It also discusses the application of mathematical modelling (digesta kinetics and metabolic models) for the accurate prediction of feed intake and digestion for specific feed combinations and animal characteristics; and testing of hypotheses and treatments in an experimental programme to generate new data.
The studies revealed the regularities of obtaining bioactivated sea buckthorn seeds using plasma-chemically activated aqueous solutions during germination. Sea buckthorn seeds were chosen as the research object. Plasma-chemically activated aqueous solutions were used to activate the germination process. This made it possible to solve the problem of processing waste from the production of sea buckthorn oil, and also contributed to obtaining a high-quality component of food products. Experimental studies have proven the effectiveness of using plasma-chemically activated aqueous solutions as effective intensifiers and disinfectants for the process of bioactivation of sea buckthorn seeds. It is shown that their use intensifies the germination of sea buckthorn seeds, contributes to a more active accumulation of biologically valuable components in the seeds. Plasma-chemically activated aqueous solutions with a peroxide concentration of 300–700 mg/l were used. An increase in the geometric parameters of seeds, namely length by 8.5–14.9 % and width by 3.7–14.8 %, was recorded. The germination energy increased by 5–13 % and germination capacity by 5–14 %. The composition of sea buckthorn seeds, both derived raw material and bioactivated, was investigated. Studies have shown that bioactivated seeds contain an increased amount of highly valuable substances. The protein content increased by 4 % compared to sea buckthorn seeds and by 1.7 % compared to the control. The lipid content increased by 2 and 1.1 %. An increase in the content of vitamins was noted: B1, B2, C, A, E, R. The amount of amino acids increased by 9–13 % compared to the control, and compared to the original raw material – by 1.5–3.5 times. In addition, plasma-chemically activated aqueous solutions effectively disinfected the raw material. The presented technology can be used in the food processing industry
The influence of the housing system on sperm productivity and reproductive capacity of rabbits was studied. Indicators like ejaculate volume, sperm density, activity, and concentration, as well as the percentage of fertility were measured for silver breed rabbits of three coloured lines housed in aggregates “Rabbitax-8” and in a modular rabbit house developed by Mykolayiv National Agrarian University. The highest male sperm productivity and reproductive capacity were found for rabbits housed in aggregates “Rabbitax-8”.
The purpose of this study was to obtain information on the genotyping of cows of Ukrainian dairy breeds for the presented loci capa-casein gene (CSN3), thyroglobulin (TG-5) gene, leptin (LEP), pituitary-specific transcription factor (Pit-1), and beta-lactoglobulin (BLG) by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and to test their association with milk production. The influence of the genotype on milk yield, fat and protein content in the milk of cows of Ukrainian selection has been established. The highest levels of milk productivity traits were expected from animals with the CT genotype for the LEP gene, AA for the CSN3 gene, CC for the TG5 gene, and AA and BB for the Pit-1 gene. But at the same time, milk obtained from cows with CSN3 BB genotype were characterized by the best cheese suitability. The effect of the homo- or heterozygous state of BLG on the signs of milk production was less noticeable, and the homozygous TT genotype for the TG5 gene was not found in any of the studied breeds. The results obtained can be used in the practical work of breeding farms along with traditional methods of selection, control and preservation of the genetic diversity of specific herds at an optimal level.
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