How to make pigs grow meat, how to improve their survival rate and prevent them

      The application effect of beer yeast in pig farming is significant, and its core mechanism is to improve the health and production performance of pig herds through multidimensional measures such as nutritional supplementation, intestinal microbiota regulation, and immune enhancement. The following analysis will be conducted from the perspective of key applications:

1、 Nutritional enhancement and growth performance improvement

      Beer yeast is rich in protein (about 50% in dry matter), essential amino acids (especially lysine, which is lacking in cereal feed), and B vitamins. It can be used as a high-quality protein source to replace some fish meal or plasma protein powder. Research has shown that adding 0.5% -5% beer yeast to piglet feed can increase the daily weight gain of weaned piglets by 11.98% -18% and reduce the feed to meat ratio by 5.4% -12.89%. This effect is also significant during the lactation period of sows, as yeast protein can promote mammary gland development, increase milk production, and indirectly improve piglet weaning weight and survival rate.

      In terms of energy metabolism, the organic chromium element in beer yeast can regulate carbohydrate metabolism and reduce energy loss. For example, active brewing yeast can increase the metabolic efficiency of fattening pigs by 3% -5% by increasing the content of rectal acetic acid bacteria and reducing the number of methane bacteria.

2、 Intestinal health maintenance and disease prevention and control

（1） Microbial balance regulation

      The mannooligosaccharides (MOS) in the cell wall of beer yeast can selectively adsorb surface lectins of pathogenic bacteria such as Escherichia coli and Salmonella, preventing their colonization in the intestine. Meanwhile, MOS acts as a prebiotic to promote the proliferation of beneficial bacteria such as lactobacilli and bifidobacteria, reducing intestinal pH by 0.3-0.5 units and inhibiting the growth of harmful bacteria. For example, adding 0.3% MOS to the diet of weaned piglets can reduce the number of Escherichia coli in the cecum by 40% and increase the number of lactobacilli by 30%.

（2） Improvement of intestinal morphology

      Yeast culture or active dry yeast can promote intestinal villus growth and increase the ratio of villus height to crypt depth. Hu Youjun et al. found that weaned piglets supplemented with heat-resistant active yeast had a 12% -15% increase in duodenal villus height and a 8% -10% decrease in crypt depth compared to the control group, significantly improving nutrient absorption area. This structural optimization is particularly important during the weaning stage of high incidence of diarrhea, which can reduce the diarrhea rate by 30% -60%.

（3） Stress resistance and mucosal protection

      β - glucan in beer yeast can enhance the intestinal mucosal barrier function and alleviate intestinal damage caused by stress such as weaning and transportation. Research has shown that when β - glucan is used in combination with vitamin C, the average daily weight gain of weaned piglets increases by 8% -10% compared to the group treated with vitamin C alone, and the incidence of diarrhea decreases by more than 50%.

3、 Immune enhancement and improvement of stress resistance ability

（1） Non-specific immune activation

      β - glucan activates immune cells such as macrophages and neutrophils, increasing serum IgG levels by 15% -20% and enhancing phagocytic ability against viruses and bacteria. For example, adding yeast cell wall extract to the diet of weaned piglets can increase serum IgG levels by 25% and enhance vaccine immune response by 30%.

（2） Anti stress and antioxidant

      Organic trace elements such as yeast selenium can enhance the body's antioxidant capacity and reduce the level of stress hormone cortisol. Under high temperature conditions, the addition of yeast culture reduced the serum malondialdehyde (MDA) content in fattening pigs by 18%, and increased the activity of antioxidant enzymes (SOD, GSH Px) by 12% -15%, significantly alleviating the inhibition of heat stress on growth performance.

4、 Optimization of Economic Benefits and Sustainable Development

（1） Reduced feed costs

      Beer yeast can replace 30% -50% of soybean meal or fish meal, and at current soybean meal prices, it can save costs of 200-300 yuan per ton of feed. For example, after using yeast feed in a pig farm in Hebei, the drug cost per pig was saved by 0.35 yuan, and the elimination rate decreased by 23%.

（2） Meat quality improvement

      The functional components in beer yeast can increase intramuscular fat content by 1.2% -2.8%, improve meat color and water retention. Research by Hu Xinxu et al. shows that adding 20% non fermented feed (including beer yeast) to pork reduces drip loss by 36.2%, shear force by 29.4%, and increases purchase price by 0.5-1 yuan per kilogram.

（3） Environmental benefits

      Yeast culture can reduce ammonia concentration in pig pens by 20% -30% and nitrogen and phosphorus excretion by 15% -20%, which meets the requirements of green farming. For example, the combination of fermented beer lees and whole price feed can reduce nitrogen excretion in fattening pigs by 18% and the number of Escherichia coli in feces by 60%.

5、 Key points of application technology

（1） Precise dose control

piglet
      Adding 0.5% -2% before and after weaning can significantly improve survival rate and growth rate.

growing and fattening pigs
      Add 0.3% -1%, focusing on improving feed conversion rate and meat quality.

Mother pig
      Adding 1% -3% during late pregnancy to lactation can reduce constipation and reproductive disorders.

（2） Collaborative efficiency strategy
      The combination with traditional Chinese herbs such as Astragalus membranaceus and Atractylodes macrocephala or probiotics such as lactic acid bacteria and Bacillus subtilis yields better results. For example, the combination of yeast culture and 0.1% vitamin C can increase the daily weight gain of weaned piglets by an additional 5% -8%.

（3） Quality control
      Choose beer yeast powder with a dryness of ≤ 8% and a bacterial count of<10 ⁴ cells/g, and store it away from light and moisture to avoid loss of active ingredients.

6、 Precautions

Avoid excessive addition
      Adding more than 5% during the piglet stage may lead to a decrease in palatability, while long-term use of more than 2% in fattening pigs may affect fat metabolism.

Synergistic effect with antibiotics
      The combination of yeast products with low-dose antibiotics (such as streptomycin) can enhance the effect, but there may be antagonistic effects with high-dose antibiotics (>100ppm).

Variety differences
      Local pig breeds may be more sensitive to beer yeast than foreign breeds, and the optimal addition amount needs to be determined through small-scale experiments.

7、 Typical application scenarios

Prevention and control of diarrhea in weaned piglets
      Adding 1% beer yeast and 0.3% MOS to the teaching trough material can reduce the diarrhea rate from 25% to below 8%.

Improvement of sow reproductive performance
      Adding 2% beer yeast and 0.1% yeast selenium during late pregnancy can increase the average number of live piglets per litter by 0.5-1 and increase the birth weight of piglets by 8% -12%.

Stress resistance during high temperature season
      Adding 1.5% beer yeast and 0.2% vitamin E to the diet of fattening pigs can increase daily weight gain by 10% -15% and reduce feed to gain ratio by 4% -6% in summer

      In summary, beer yeast, as a natural and multifunctional feed additive, has significant advantages in improving pig production performance, improving intestinal health, enhancing immunity, and reducing breeding costs. It is an important choice for achieving antibiotic reduction and substitution, and developing green breeding.