What is the application effect of brewing yeast in aquatic feed?

      Saccharomyces cerevisiae is widely used in aquatic feed, and its effects are mainly reflected in improving the growth performance of aquatic animals, regulating intestinal health, enhancing immunity, and improving feed utilization efficiency. It is particularly suitable for various aquaculture species such as fish, shrimp, crabs, shellfish, etc. The following is a detailed analysis of its specific application effects:

1、 Promote growth and improve breeding efficiency

Improve weight gain rate and survival rate

      Brewing yeast contains abundant protein (40% -50%), amino acids (such as lysine, methionine), B vitamins (B1, B2, niacin, etc.), and minerals (phosphorus, potassium, magnesium, etc.), which can provide high-quality nutrition for aquatic animals. At the same time, the digestive enzymes produced by yeast (amylase, protease, lipase, etc.) can help break down carbohydrates, proteins, and fats in feed, improving nutrient absorption efficiency.

      Case: Adding 2% -3% brewing yeast to grass carp feed can increase their weight gain rate by 15% -20% and survival rate by 8% -10%; Adding 1% -2% yeast can significantly increase the body length growth rate and weight growth rate of South American white shrimp.

Improve Feed Conversion Rate (FCR)

      Yeast enhances the intestinal absorption capacity of nutrients and reduces feed waste. Research has shown that adding brewing yeast to tilapia feed can reduce feed conversion rate by 10% -15% and correspondingly lower breeding costs.

2、 Regulating intestinal microbiota and reducing intestinal diseases

Maintain the balance of gut microbiota

      Brewing yeast can competitively inhibit the colonization of harmful bacteria such as Vibrio and Escherichia coli in the intestine, while promoting the proliferation of beneficial bacteria such as lactic acid bacteria and bifidobacteria, forming a stable intestinal microbiota barrier.

      Shrimp, crab and other crustaceans have short intestines and are easily affected by the environment. Adding yeast can reduce diseases caused by imbalanced gut microbiota, such as "jejunal empty stomach" and "stealing disease".

Protect intestinal mucosa and enhance digestive function

      The mannan oligosaccharides (MOS) in yeast cell walls can promote the proliferation of intestinal mucosal cells, repair damaged mucosa, and increase intestinal absorption area. In addition, the organic acids (such as lactic acid) produced by yeast metabolism can lower the pH value of the intestine, further inhibit harmful bacteria, and activate digestive enzyme activity.

      For example, adding yeast to sea bass feed can increase the length of intestinal villi by 20% -30% and significantly improve digestion and absorption efficiency.

3、 Enhance immunity and improve stress resistance

Activate immune response

      β - glucan and mannan in the cell wall of brewing yeast are important immune enhancers:

      β - glucan: can stimulate the activity of immune cells such as macrophages and neutrophils in aquatic animals, enhance non-specific immunity, and improve resistance to viruses and bacteria (such as Pseudomonas aeruginosa).

      Mannan: It can adsorb pathogenic bacteria (such as Vibrio) in the intestine, prevent them from adhering to intestinal cells, and reduce the risk of infection.

Improve stress resistance ability

      Aquatic animals often face stress such as water temperature fluctuations, water quality deterioration, and high-density farming in aquaculture. Adding brewing yeast can regulate the body's metabolism (such as increasing liver glycogen reserves) and reduce the impact of stress response on growth and health. For example, in the cultivation of Penaeus vannamei, yeast can increase its survival rate during salt mutations.

4、 Absorb toxins and improve the breeding environment

Degradation of harmful substances in water bodies and feed

      The cell wall of brewing yeast has a strong adsorption capacity for mycotoxins such as aflatoxin and vomitoxin in feed, which can reduce the damage of toxins to the liver and intestines of aquatic animals. At the same time, yeast can decompose organic matter in residual feed and feces in water bodies, reduce ammonia nitrogen and nitrite content, and indirectly improve aquaculture water quality.

Reduce the use of antibiotics

      Due to the ability of yeast to enhance the immunity and disease resistance of aquatic animals, it can reduce the occurrence of bacterial diseases, thereby reducing the frequency of antibiotic use, which is in line with the trend of green aquaculture.

5、 Applicable varieties and differences in effectiveness

There are slight differences in the demand and response of brewing yeast among different aquatic animals, as shown below:

6、 Precautions

      The amount of addition should be reasonable: excessive addition may increase the burden of intestinal digestion (such as bloating in fish), and should be adjusted according to the variety and growth stage.

      Synergistic use with other additives: can be combined with probiotics (such as lactic acid bacteria) and enzyme preparations to enhance the effect, but should avoid using high concentrations of antibiotics at the same time (antibiotics can inhibit yeast activity).

      Storage conditions: Keep dry and cool to prevent yeast inactivation and affect efficacy.

summarize

      As a green and efficient feed additive, brewing yeast can significantly improve animal growth performance, health status, and breeding efficiency in aquaculture, especially suitable for the current demand of "reducing resistance, improving quality, and environmental protection" in aquaculture. Its application effect has been extensively studied and verified in practice, and it is a highly valuable functional raw material for promotion in aquatic feed.