The Influence of Milk Production on Reproductive Indices in Cows Inseminated with HeiferPlus Semen

Abstract

More and more dairy cows with high milk producing are experiencing infertility problems caused by both negative postpartum energy balance and the inhibitory action of the hormone prolactin on the hormones GN-RH and FSH. The present paper analyses the relationships between milk production and reproductive indicators in a population of dairy cows that were artificially inseminated with HeiferPlus semen. This semen, according to those who sell it, increases the percentage of fecundity by 5-15% and the sex ratio is 65-85% in favour of the calf with the predetermined desired sex. The work was carried out at the Balotesti Bovine Development Research Institute, on a herd of 50 heads, Romanian Black Spotted cows, owned by the institute. The analysed data capture the farm's activity between years 2020 -2021. Milk production was monitored by the specialists who carry out the Official Control of Milk Production and the reproduction data were taken from the TAURINE.EXE farm program. The reproductive indicators monitored were: conception rate, services per conception, non-return rate, service period interval and sex ratio. The statistical processing of the data was carried out using the Microsoft Excel program.