Feed Additives with the Inclusion of Co and Mn Change Their Bioavailability and Digestibility of Substances in Bull Calves

Abstract

Abstract In accordance with the scheme of the experiment animals in the control group received the basic diet (BD), Experimental Group I–BD + feed additive, replacing 30% of the concentrated part of the ration with the inclusion of salts of sulfates of cobalt and manganese, Group II – BD + feed additive, replacing 30% of the concentrated part of the ration with the inclusion of nano - and microparticles of cobalt and manganese. In situ studies found that the dry matter digestibility of feed additives containing chemically pure metal particles of cobalt and manganese and inactivated feed yeast was 15.4-20.0% (P<0.05) lower than in additives with wheat bran. However, when simulating rennet digestion (in vitro), it was found that the dry matter digestibility of feed additives containing chemically pure metal particles of cobalt and manganese and inactivated feed yeast increased by 1.5-2.2% in relation to additives containing wheat bran. Comparing the availability of pure manganese, we note that in the mixture with feed yeast, it was higher than with bran by more than 2.6 times. Similar values were observed for its inorganic form.