TY JOUR TI POLYMORPHISM OF PARAOXONASE-1 GENE (PON1) AND ITS ASSOCIATION WITH ECONOMIC TRAITS OF HOLSTEIN CATTLE KW gene; genotype; paraoxonase-1; PON1; polymorphism; heifers; cattle; growth; reproductive ability; milk yield; fat; protein. JO Vestnik of Kazan State Agrarian University AU Safina, N.Y. AU Shakirov, S.K. AU Gaynutdinova, E.R. AU Fattahova, Z.F. PY 2020 IS 15 PB Kazan state agrarian University