Abstract
A mineral feed additive in the composition of selenium and cobalt aspartate nanoparticles (OMEC-Co) was tested and an assessment was made of the growth rate and feed costs for calves of the dairy period of growing. As a result of the research, it was found out that calves from the control group grew by 631 g daily. This figure in the calves of the experimental groups was 12 and 18 g more. The difference ensured higher gross growth. Due to this, the calves of the experimental groups used energy and nutrients better and spent 0.06 and 0.09 EFU less compared to their peers from the control group.
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