Organic biological feedstuff additive containing nano-selenium, zinc oxide, preparation and use method thereof

The invention relates to organic biological feed additives containing nano selenium and zinc oxide, a preparation method and a use method. The product of the organic biological feed additives is russety dry powder with a granularity between 80 and 140 nanometers, and can form suspension with water; the selenium content is between 0.00 and 36.00 percent and the zinc content is between 0.00 and 45.00 percent; the selenium content and the zinc content can not be 0 simultaneously; the organic biological feed additives are prepared by nano selenium organic biological intermediates and nano zinc oxide organic biological intermediates which are respectively prepared by fermentation of selenium dioxide and nano zinc oxide through microorganisms in the presence of various nutrient components; and 2.3 to 11.5 mass times of water is uniformly mixed with the organic biological feed additives containing the nano selenium and the zinc oxide and then sprinkled in feed which is then used for feeding laying hens, milk cows or nanny goats for 5 to 10 days. Compared with contrast feed, the selenium content and the zinc content of produced eggs are respectively 2 to 5 times and 2 to 2.5 times; the selenium content and the zinc content of produced milk are respectively 3 to 6 times and 2 to 4 times; and the selenium content and the zinc content of produced goat milk are respectively 3 to 7 times and 3 to 6.5 times.