Abstract
It has been established the close relationship between gene polymorphism of lactoferrin (LTF) with an incidence of mastitis and somatic cell counts in milk of mammals. Lactoferrin gene products are associated with resistance to several diseases, and particularly for mastitis. Lactoferrin (LTF) is a multifunctional small glycoprotein of milk. Its main function is to protect the breast. It is considered that genetic variants of DNA lactoferrin could be used as a marker for the prediction of somatic cells in milk and mastitis incidence. Allele A of LTF gene is associated with the incidence of mastitis in mammals such as cows. It has also been established that the polymorphism of BMP15 and GDF9 genes of sheep influence the number and rate of ovulation. Thus the alleles of Bone morpho-genetic protein (BMR15) gene influence the process of folliculogenesis in sheep. Sheep heterozygous on this locus ovulate two or three oocytes. The authors of this study recommend the use of polymorphism BMP15 gene as DNA markers to increase fertility in sheep. It is well known that products of GDF9 gene control the process of growth and development of follicles in cows. Polymorphisms of the gene is well studied in medicine. Women who have a mutation in the coding region of the gene GDF9 found signs of premature ovarian failure. The study of lactoferrin gene polymorphism has theoretical and practical importance since there is a positive correlation between the content in milk of somatic cells and genetic variants of lactoferrin. Thus, the authors suggest the use of GDF9 gene polymorphism in cows as a DNA marker for the prediction of reproductive function in mammals. The aim: to study DNA polymorphism of genes LTF, GDF9 and identified animals (Bos Taurus L) with the desired genotype for the studied loci to build model for searching new pharmacological agents.