Houttuynia cordata, as a natural product, has the characteristics of safety, nutrition, and low toxic and side effects, and has begun to be used as a new additive in feed.
1. Antibacterial effect and bacteriostatic test showed that Houttuynia cordata extract has a wide range of antibacterial effect, and has obvious inhibitory effect on Catacoccus, Staphylococcus aureus, Influenza bacillus pneumococcus; It has an obvious inhibitory effect on Escherichia coli Proteus, Shigella, Mycobacterium, diphtheria bacillus, penicillium Aspergillus niger and yeast have a certain inhibitory effect; it also has a strong inhibitory effect on typhoid bacillus and Leptospira.
Studies have proved that Houttuynia cordata extract has strong antibacterial effect on E. coli and Salmonella, and the minimum inhibitory concentration is 0.65.1.45g/L respectively.
The effects of different kinds of volatile oil in Houttuynia cordata against Staphylococcus aureus and Sarcina luteus, the results show that all the volatile oils have a good inhibitory effect on the tested bacteria.
2. Antioxidant effect Houttuynia cordata has scavenging effect on DPPH. free radical activity, .OH free radical and superoxide 02. free radical. It is a good natural antioxidant. Cai Wenguo et al. (2013) found that the antioxidant effect of Houttuynia cordata is directly related to its total phenols and flavonoids. The content of total phenols and flavonoids is high, and the antioxidant capacity in vitro is strong.
Toda (2005) believes that the processing of Houttuynia cordata into natural antioxidants has great development and utilization value.
3. Enhance the immune function of the body Houttuynia cordata can enhance the phagocytic ability of white blood cells and increase the serum properdin level to enhance the body's non-specific immunity.
4. Other functions Houttuynia cordata also has anti-allergic, anti-inflammatory, diuretic and other functions.
Houttuynia cordata contains a variety of nutrients and physiologically active ingredients. Adding to feed has the advantages of high nutritional value, good medicinal efficacy and good palatability. In addition, it can also be used as an ideal substitute for antibiotics in feed.
Adding a certain proportion of Houttuynia cordata to the diet can increase the daily gain, feed intake and feed digestibility of livestock and poultry, reduce the feed-to-meat ratio, and reduce the rate of diarrhea at the same time.
After experimentation, adding a proper amount of Houttuynia cordata extract to the diet of 35-day-old weaned piglets can promote the growth of piglets, increase daily weight gain, increase feed intake, reduce feed-to-meat ratio and diarrhea rate of piglets.
The daily gain of fattening pigs is increased by 5.4%-10%, the feed-to-meat ratio is reduced by 3%-13%, and the 0.2% dosage is the best.
A large number of studies have shown that adding a certain amount of Houttuynia cordata extract to the diet can effectively enhance the immunity of livestock and poultry, reduce the incidence of disease and increase the survival rate. The diarrhea rate is reduced by 60%-70%, and the survival rate is increased by 7%-10%. The effect is even more obvious than that of antibiotics. The addition of Houttuynia cordata extract in the diet of chickens is 0.3%-0.5%. The growth and metabolism of broilers have no negative effects, and they can improve lipid metabolism and improve their immunity.
