EFFECTS OF SUPERFLUOUS MAGNESIUM DOSES AND FAT AND OIL ADDITIONS TO FEED RATIONS ON PHYSIOLOGICAL-PARAMETERS IN THE BLOOD AND RUMEN FLUID OF CATTLE

Effects of magnesite emissions on physiological parameters in the bloo d and rumen fluid of young bulls were studied in physiological trials on young bulls of Black-Pied breed, live weight of 400 kg, which were applied rumen cannulas. Four model feed rations, control and three exp erimental ones, were tested: magnesite emissions (U), magnesite emissi ons + waste fat (T) and magnesite emissions + rapeseed oil (O) at a do se of 5% of feed dry matter. A daily dose of magnesite emissions (201 g) was calculated from immission deposition per 1 m(2) of land area. F ollowing addition of magnesite emissions, concentrations of soluble Mg in rumen fluid significantly increased (P < 0.05) within three hours from feeding, in comparison with control feed ration. Plasma magnesium showed the same tendency (P < 0.05). Additions of rapeseed oil and wa ste fat significantly increased plasma P concentration (P < 0.001) whi le Ca concentration decreased insignificantly. The additions of emissi ons did not have any depressive effects on total counts of infusorians . Their counts increased from 1.55 to 2.32 x 10(7)/g of rumen contents dry matter as a result of emission feeding. The addition of waste fat and rapeseed oil increased their counts to the level of control feed ration.