Magistro darbas parengtas Lietuvos sveikatos mokslų universitete, Veterinarijos akademijos, gyvūnų mitybos katedroje. Darbą sudaro šios dalys: turinys, įvadas, santrauka, literatūros apžvalga, tyrimo metodai, rezultatai ir jų aptarimas, išvados, rekomendacijos. Tyrimo uždaviniai buvo išanalizuoti melžiamų karvių racionus, atlikti pieno ir biocheminius kraujo tyrimus. Nustatyti mitybos įtaką melžiamų karvių sveikatingumui, ir pieno kokybei. Tyrimui buvo pasirinkti du ūkiai. Kiekviename ūkyje atrinkta po trisdešimt melžiamų karvių. Iš karvių paimtas kraujas ir atlikti biocheminiai kraujo tyrimai, nustatytos kraujo fermentų TP, GLU, AST, ALP, CREA, ALB ir mineralinių medžiagų Ca ir PHOS kiekiai. Atlikus pieno tyrimus buvo nustatyti pieno riebalų, baltymų, urėjos ir laktozės kiekiai tiriamajame piene. Analizuojant karvių racionus, įvertinta pašarinių žaliavų mitybinė ir energetinė vertė. Vertinant ūkių pašarines žaliavas akivaizdžiai matėsi, kad karvės šeriamos aukštos energetinės vertės baltymingais, pašarais. / This master work was prepared in Lithuanian University of health Science, of Veterinary Academy Department of Animal Nutrition. The master work consists of a content, introduction, summary, review of literature, research methods, results and itʹs consideration, conclusion, recomendations. The objectives of this study was to analize dairy cows rations, to perfom milk and blood biochemical tests. Results of the research to relate with cows feeding and to ascertain the impact of nutrition for dairy cows health and quality of the milk. Were selected two farms for the research. In each farm selected for thirty dairy cows. Were conducted biochemical studies of blood enzyme TP, GLU, AST, ALP, CREA, ALB and minerals concentrations of Ca and PHOS. After the milk testing was to determine milk fat, protein, lactose and urea levels in the investigated milk. After analysis of cow rations, was appreciated of feed materials and energy value. In assessment of farm feed material was seen obviously that cows fed high protein, high-energy food. In one of the investigated farms observed shortage of roughage.

Fasioloides magna is a trematode parasitizing in the liver parenchyma of ruminants. Its life cycle is associated with the humid environment and includes intermediate freshwater snail hosts from family Lymnaeidae. According to the ability of host to form a certain type of a pseudocyst during fascioloidosis, they can be,divided in three groups, specific definitive hosts (red deers, fallow deers, roe deers), nonspecific definitive hosts (cattle, wild boars and elks) and atypical hosts (sheeps and goats). Beside the natural infections also the experimental infections of other potential host species has been realized (chamois, llama and bighorn sheep and traditional laboratory animals such as mice, guinea pigs, rats and rabbits). In the context of different diseases, many changes in infected organism can occur. These can be qualitatively and quantitatively evaluated. Similarly, during fascioloidosis the changes associated with the presence of the parasite in the host's body is possible to monitor, e.g. antibody production, increase in the number of eosinophils, release of eggs in faeces, internal bleeding, or the level liver damage. The liver damage is corresponding primarily to biochemical parameters of blood, not only the liver enzymes, but also other blood components, like blood proteins, lipids,...