(i) Viable yeast, classified as live Probiotic, « Direct-Fed Microbial » or ‘DFM’
- High value ingredient
- Evaluated through controlled field trials
- Accompanied by claims relating to the targeted animal species.
- Handling depends on thermostability of particular strain.
Examples of claims:
- Improving gut ecology
- Improving feed conversion
- Better rumen function in the dairy cow and cattle.
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| (ii) Inactive yeast
- Often considered as by-product from other processes. Represents an excellent source of protein – between 40 to 50 % on a dry basis.
- Collected and dried with thermal energy.
- Generally low cost. Can be pelletized and extruded.
- Drying conditions, may negatively affect bioavailability of certain nutrients.
- Inactive yeast biomass can be used directly in feed manufacturing , or used for further secondary processing (see next)
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(iii) Specialty products and derivatives , at times termed ‘Prebiotics’
- Applications which exploit the bioactive properties of specific yeast fractions
- Unique functions are promoted for components such as :
• Cell wall poly- and oligo-saccharides,
• Cytoplasmic nucleotides,
• Selenized proteins or chelated trace minerals, obtained by propagation of yeast cells on culture medium containing inorganic elements. |
