Difference between animal feed and human active dry yeast

      The active dry yeast used in animal feed and the active dry yeast consumed by humans have similarities in core components (yeast), but there are significant differences between the two in terms of strain selection, production process, functional use, and safety standards. Here are the specific differences:

1. Differences in bacterial strains and functions

Animal feed yeast

      Strain characteristics: It is possible to select strains that are resistant to high temperatures, stomach acid, or have specific metabolic abilities (such as yeast that promotes rumen fermentation in ruminants).

      Functional objectives: Focus on improving animal intestinal health, enhancing immunity, and increasing feed conversion rate (such as decomposing cellulose or reducing ammonia emissions).

Human yeast

      Strain characteristics: Priority should be given to strains with strong fermentation performance (such as making bread and beer) or clear probiotic functions (such as Brandy yeast CNCM I-1079).

      Functional objective: Used for food fermentation (such as baking, brewing) or as a probiotic supplement to regulate gut microbiota.

2. Production process and carrier

feed yeast

      Processing technology: lower cost fermentation substrates (such as agricultural by-products) and drying processes may be used, with lower purity requirements.

      Carrier: commonly used cheap carriers such as bran and corn flour to ensure uniform distribution in feed mixing.

Human yeast

      Processing technology: It should meet the food level health standards, and fine processes such as spray drying may be used to reduce impurities.

      Carrier: Using food grade raw materials (such as skim milk), without any adverse flavors or allergens.

3. Activity and stability requirements

feed yeast

      High temperature granulation (60-90 ℃) and long-term storage (possible exposure to humid environments) during feed processing need to be tolerated.

      The number of live bacteria is usually 10 ⁹ -10 ¹⁰ CFU/g, but some products may allow for lower activity.

Human yeast

      Emphasis is placed on rapid activation under specific conditions (such as starting at 37 ℃ during baking), with higher requirements for storage stability (such as light avoidance and moisture-proof packaging).

      The number of live bacteria is usually higher (probiotics can reach 10 ¹⁰− 10 ¹¹ 10CFU/g).

4. Safety and regulatory standards

feed yeast

      Following the "Catalogue of Feed Additives" and the standards of the Ministry of Agriculture (such as NY/T 1969), trace impurities (such as heavy metal lead ≤ 10mg/kg) are allowed.

      No human safety testing is required, but the safety of animals needs to be verified.

Human yeast

      Compliant with national food safety standards (such as GB 4789.15-2016), with stricter limits for heavy metals (lead ≤ 0.5mg/kg).

      Toxicological evaluation and human clinical trials (such as as as probiotics) are required.

5. Cost and Market Positioning

      Feed yeast: Low price (about 10-50 yuan/kg), mainly purchased in bulk, emphasizing cost-effectiveness.

      Human yeast: The price is relatively high (such as probiotic preparations reaching hundreds of yuan/kg), and the packaging and brand premium are significant.

keynote

      Not replaceable: Feed yeast may contain non food grade carriers or strains, posing safety risks for human use; On the contrary, the cost of using yeast for humans is too high and may not be suitable for the digestive characteristics of animals.

      Regulatory risk: If feed yeast is used for food processing, it may violate the Food Safety Law, and vice versa.

      It is recommended to choose compliant products based on specific needs and consult industry experts or refer to relevant standards (such as the yeast standard for feed GB/T 36861-2018).