The aim of (his study was to reveal the occunence of nitric oxide (NO) concentration changes after synchronisation. cycle stages in cows. For this. the following were carried out respectively: Fourty Holstein cows were used to study and estrous cycles were synchronisated by using single doze PGF2a in norma) ovarial structure animals. https://fitnessgravesyardes.shop/product-category/flywheel-w-bracket-bearing/