Extrusion

Extrusion is the dominant kibble manufacturing process, using high heat and pressure followed by forcing the mix through a die to shape the pellets, which then expand and dry. It ensures preservation and good starch digestibility, since cooking gelatinises the starch and makes it absorbable, and the brief high temperature sharply reduces microbial load (manufacturing technology). Extrusion is the benchmark against which alternative methods such as [baked](/glossary/baked), [cold-pressed](/glossary/cold-pressed) and [air-dried](/glossary/air-dried) recipes are compared, and despite a frequent assumption that high heat must be harmful, well-controlled extrusion produces complete, balanced foods when formulation and supplementation are correct. Because the process is intense, heat-sensitive nutrients such as certain vitamins and omega-3 oils are often added afterwards via [coating](/glossary/coating). One nuance worth noting: extrusion does not fully destroy heat-stable contaminants such as [aflatoxins](/glossary/aflatoxins) and other [mycotoxins](/glossary/mycotoxins), so raw-material control upstream remains essential. The marker: extrusion is a reliable, widely used technology whose reputation for being aggressive is largely a marketing contrast point, and a kibble's worth depends on its recipe far more than on the fact that it was extruded. It is central to understanding how most dry pet foods are made, a foundation for many entries in the [Petipedia glossary](/glossary).

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