Barley Grain

Malting and feed barley are the same commodity sorted by outcome. Maltsters buy on a narrow specification because malting is a controlled germination: the grain is steeped, allowed to sprout, and then kiln-dried at the moment enzyme development is right. Grain that will not germinate evenly cannot be malted, and grain whose protein is too high yields less extract and can cause haze in the finished drink. Feed buyers, by contrast, want bulk energy and are largely indifferent to whether the embryo is alive.

Germination capacity

The proportion of kernels able to germinate. Central to malting value and destroyed by heat, mechanical damage, or prolonged poor storage.

Skinning

Loss of the adhering hull from the kernel, usually caused by threshing or handling. Skinned kernels malt unevenly and are a graded defect in malting barley.

Screenings

Small and thin kernels separated over a screen. Malting contracts specify kernel size uniformity because size drives even steeping.

The dominant food-chain pathway for barley is malting: malted barley is the primary product, made by germinating and kilning selected barley, and it supplies brewing, distilling, and a range of malt-based foods. A quite separate mechanical route removes the hull and abrades the outer layers to produce pearl barley, a food grain sold for direct cooking. Most barley by volume, however, never enters either route — it is fed to livestock, whole or processed, with ruminant rations the largest outlet.

• Beverage — malted and used in brewing and distilling
• Feed — the largest outlet by volume, particularly for ruminant livestock
• Food — pearl barley, barley flakes, and malt-based food ingredients
• Seed — retained or certified for the next crop

Barley grades against the usual physical measures — moisture, test weight, foreign material, damaged and broken kernels — but malting acceptance is decided by a contract specification layered on top of the grade, and it is stricter. Protein is measured and bracketed rather than maximised; kernel size distribution is measured over slotted screens; germination is tested directly; and skinned or split kernels, pre-germination in the field, and any heat damage are all counted against the lot.

Two-row and six-row barleys are traded as distinct types with different processing behaviour, and maltsters commonly buy named varieties from approved lists rather than accepting any barley that meets the numbers. That is a real difference from most cereal trade: variety identity, normally a crop-level concept, becomes part of the commodity specification.

Storage practice for malting barley is set by a constraint no other cereal imposes: the drying air must stay cool enough to leave the embryo viable, so malting lots are dried more gently and more slowly than feed grain of the same moisture. After drying, the grain needs a dormancy-breaking period before it will germinate evenly, which means freshly harvested barley is not immediately maltable even when it meets every number.

Beyond that, barley stores much like other cereals: dry, cool, aerated, monitored for insects and heating, and segregated by type and intended market. Because the hull protects the kernel, skinning during augering and free fall is a handling-induced defect worth engineering out of a malting chain.