Composition is not nutrition
Two ingredients with the same proximate analysis can perform very differently. Processing intensity, anti-nutritional factors, fibre matrix and particle size all move digestibility while leaving the proximate profile unchanged.
Practical proxies for buyers
Full digestibility trials are impractical per shipment. Buyers use proxies: protein dispersibility index and urease for soy products, pepsin digestibility for animal proteins, reactive lysine for heat-processed proteins, and starch gelatinisation for extruded materials.
O que verificar
- —Which species and life stage the digestibility coefficient refers to
- —The proxy test result relevant to the process route
- —Whether the value is measured, predicted or copied from a published table
Riscos típicos
- —Overestimated nutrient supply in the formulation matrix
- —Batch-to-batch variability that averages out on paper but not in the barn
Erros comuns
- —Transferring poultry coefficients to aqua or swine diets
- —Assuming digestibility is stable across origins and seasons
Perguntas frequentes
Can digestibility be written into a purchase contract?
Directly, rarely. In practice buyers contract the measurable proxies — urease activity, KOH solubility, pepsin digestibility, reactive lysine — which correlate with digestibility and can be verified on a sample.
Temas relacionados
The amino-acid profile — and above all digestible lysine, methionine, threonine and tryptophan — is what protein ingredients are actually bought for in modern formulation.
Particle size distribution governs mixing homogeneity, pellet quality, digestive efficiency and segregation risk, and is specified as a geometric mean diameter with a distribution, not a single sieve figure.
Crude protein is nitrogen content multiplied by a conversion factor (usually 6.25); it estimates total protein but says nothing about amino-acid quality or digestibility.
Monte uma RFQ estruturada com parâmetros, tolerâncias e etapas de verificação incluídos — gratuito para compradores.
Iniciar sua RFQNomes de parâmetros técnicos e métodos analíticos permanecem em inglês porque são citados literalmente em contratos, certificados e normas internacionais.
Referência educativa. A FeedMatch Group não classifica, recomenda nem endossa fabricantes.
← Todos os temas