EN
The experiment was carried aut on 110 diary cows of red and white breed, raised on a breeding farm of Jeleniów /near Kudowa/ in the years 1983-1985. The cows were grazed on a pasture-fertilized with P₂O₅, K₂O and N; the dosage applied was: 70, 80 and 150 kg/ha, respectively. The grassland was rich in white clover /30-40%/. The mainstay in the cow's diet during winter time was hay and silage produced from grasses. The following mineral feed and salts were fed to the cows ad libitum: Microfos, MM-B, halite, salt manufactured by a co-operative in Koło, salt from Wieliczka supplemented with microelements, called Wisol-BM. The results obtained in this experiment concur with our earlier observations, proving that bulk feed in 10 times lower in sodium than it is required in the cow's diet. A daily requirement for salt was found to be the dosage of 60 g. Type of salt did not have a crucial effect on the productivity of supplemented cow's.