Results of applying gonadorelin Fertagyl on the progesterone concentrations in the blood serum and cow conception

Considering there are different and inconsistent results of the wider use of gonadotropin-releasing hormone or its analogs in cattle breeding and due to scarce research studies in the field of individual breeding, we decided to explore the influence of gonadorelin Fertagyl on the results of the blood serum progesterone levels and conception of cows in veterinary field practice. Examination of the progesterone levels involved 14 (fourteen) cows treated with gonadorelin (GnRH), Fertagyl, manufactured by Intervet, according to the manufacturer’s instructions dose of 2,5ml (250 micrograms), within five minutes after insemination. There are individual differences in progesteron concentrations according to days of sampling in treated cows, respectively individuality is manifested in all cows between days of blood sampling, except for period of luteolysis (18th day) in non-gravid cows. Our research results indicate that there is a tendency for progesterone concentration to increase in gravid cows treated with Fertagyl at the time of insemination. Progesteron concentrations in blood serum in gravid cows were higher for 0.21 ng/ml in first three days after insemination and at 6th day those concentrations were higher for 0.40 ng/ml compared to non-gravid cows.