The invention discloses a
disease-preventing pig feed containing supramolecular bamboo leaf and rhizoma polygonati extracts and a preparation method thereof.The preparation method comprises the following steps that
carnitine and
citric acid are used for preparing a natural
deep eutectic solvent (NaDES), and the
carnitine and the
citric acid are mixed according to the
molar ratio of 1: (0.2-4) and heated and stirred for 3-12 hours at the temperature of 40-80 DEG C to prepare the NaDES
solvent; the preparation method comprises the following steps: crushing bamboo leaves and rhizoma polygonati, mixing according to a
mass ratio of 1: (0.1-5), adding into a 0.1-0.5 g / mL NaDES
solvent, extracting at 50-80 DEG C for 1-4 hours, and concentrating and
drying to obtain a supramolecular extract; 0.1%-1% of the extract is added into a corn-
soybean meal type basal feed. According to the method disclosed by the invention,
plant cell walls are efficiently destroyed by utilizing the NaDES
solvent, so that the extraction yield of polysaccharides in the bamboo leaves and the rhizoma polygonati reaches 50.16%-52.73%, and the extraction yield of
flavones reaches 43.87%-52.73%. Feeding experiments show that the feed can significantly improve the daily average
weight gain (0.59-0.69 kg) of live pigs, reduce
blood cholesterol (2.2-2.4 mmol / L), improve the
feed conversion ratio (2.54-2.72) and reduce the incidence of diseases. The process is green and efficient, and is suitable for large-scale production.