Phenotypic and genotypic resistance to antibiotics in strains isolated from cattle milk in Northern Kazakhstan.

Background And Aim: is the most frequent and ubiquitous cause of mastitis in cows. In recent decades, antibiotic resistance has rapidly spread among infectious disease pathogens in Kazakhstan and globally. This study examined the phenotypic and genotypic resistance of .

Genetic polymorphism of prolactin and nitric oxide synthase in Holstein cattle.

Background And Aim: Bacterial and viral infections affect the welfare of animals and lead to large economic losses in dairy cattle breeding due to decreased productive indicators and increased culling rates. In modern dairy farming, farmers are looking for effective solutions to prevent and minimize infectious disease risks. To this end, the most relevant study field is the search for gene sites that impact production and health.

Preferred and undesirable genotypes of and genes for the milk yield and quality of black-and-white breed.

Background And Aim: The market demand for the quality of milk and dairy products, in particular in terms of such indicators as fat content, the amount and composition of milk protein, etc., is growing. Thus, the need for the selection of dairy herds using genetic markers associated with qualitative traits of milk productivity is becoming urgent.