Author: fast-admin

Sampling is often treated as a formality before a purchase decision that has already been made. Used properly, it is the cheapest way to avoid a contract that does not fit your process.

Decide what the sample must prove

Before ordering anything, write down the question. Usual candidates:

• does the material meet our specification on the parameters we formulate on?
• does it flow and mix on our line at the planned inclusion rate?
• do the animals accept the finished feed?
• is the documentation sufficient for our quality system?

Each question implies a different sample size and a different test. A laboratory check needs a few hundred grams; a mixer trial needs kilograms.

Order the form you will actually buy

The most common wasted sample is the right material in the wrong form. If you intend to buy pellets, do not evaluate flakes. If you intend to specify a granulation, ask for that granulation, even when it is described as available by agreement.

Ask for the paperwork at the same time

Request the product specification and a certificate of analysis for the sampled batch together with the material. This lets your quality team review the documentation while the technical trial runs, instead of discovering a gap after a positive result.

Test more than one supplier in parallel

Sequential trials drift: different weeks, different operators, different ambient conditions. Running two or three candidates in the same period on the same line is the only way to compare them fairly.

Keep a retained sample

Store part of every approved sample, labelled with the batch number and date. When a delivery six months later looks different, the retained sample turns an argument into a comparison.

Be explicit about larger volumes

Standard sample sizes exist because free material is a real cost to the supplier. If you need more than the standard format, say what for: a pilot run on a defined batch size is a reason any producer understands, and stating it up front is faster than negotiating afterwards.

A sample programme run this way takes a few weeks and removes most of the risk from a first contract.

Intake is the first condition for any nutritional plan to work. A recipe that meets every target and is eaten reluctantly performs worse than a simpler one the animal finishes.

Why fruit-derived materials help

Dried fruit pomace carries the aroma and taste of the source fruit into a compound feed. Apple pomace is the most widely used, but strawberry, raspberry, blackcurrant, aronia, elderberry and cranberry pomace all contribute a recognisable natural profile alongside their fibre fraction.

The mechanism is straightforward: a more attractive smell and taste increase acceptance, particularly in feeds whose other components are neutral or bitter.

The second effect, in horses

Increased acceptance means more chewing, and chewing produces saliva. Saliva buffers gastric acid and helps protect the stomach lining from irritation. In equine feeds a palatable fibre carrier therefore does nutritional and physiological work at the same time.

Colour is part of the product

Dried carrot granules and berry pomace also affect appearance. In consumer-facing products, visible natural components support the positioning of the feed, which is why the physical form matters: flakes are seen, ground material is not.

What to test before deciding

Palatability cannot be read from a specification. A short comparative trial answers it:

• test the candidate materials at the inclusion rate you actually plan to use
• keep everything else in the recipe constant
• measure refusals, not only consumption, and give the animals enough days to pass the novelty effect
• repeat with a second batch to separate the ingredient from one good lot

Ordering for a trial

Standard samples of 0,5 kg are enough for laboratory work and a first sensory check. For a feeding trial, ask for a larger format and say why: a supplier can usually accommodate 1 to 2 kg per product when the purpose is clear, and a pilot run on a real batch is worth more than any number of comparisons on paper.

Most complaints about dried plant ingredients are storage problems, not production problems. The material left the plant within specification and picked up moisture somewhere between the truck and the mixer.

Moisture is the parameter that moves

Dried fruit and vegetable materials are hygroscopic. Apple pomace leaves production at roughly 10 % moisture and will climb toward equilibrium with the surrounding air if given the chance. Every point gained shortens shelf life and raises microbiological risk.

The usual storage condition for this class of material is cool and dry: below about 25 °C and a maximum of 70 % relative humidity. Under those conditions, 24 months from production is a realistic shelf life for a correctly dried product.

Where moisture actually gets in

• bags opened and left unsealed between production runs
• big bags stored directly on a concrete floor, which transmits both cold and damp
• outdoor or unheated storage where night cooling causes condensation inside the packaging
• pallets stacked against external walls

None of these are exotic failures. They are the normal state of a busy warehouse unless someone has decided otherwise.

Shelf life is a condition, not a date

A 24-month figure assumes the stated conditions. Treat the date as valid only while those conditions hold, and check material that has been stored through a humid summer before using it in a sensitive recipe.

Oils and full-fat materials are a separate case

Ground full-fat seed and cold-pressed oils oxidise rather than absorb. For these, light and oxygen matter more than humidity, storage times are shorter, and stock rotation needs to be enforced rather than assumed.

Practical checks on receipt

Record the batch number, confirm the packaging is intact, and compare the delivered material with the certificate for that lot. If you sampled the product before contracting, keep the retained sample: comparing a delivery against the material you originally approved settles most discussions quickly.

Linseed reaches the feed industry in at least five distinct forms, and they are not variations of one ingredient. Each carries a different fat, protein and fibre balance, and each behaves differently in storage.

Whole seed

Cleaned whole flaxseed retains its full oil and fibre fractions and is the most stable form on the shelf, because the oil stays inside an intact seed coat. The same intact coat limits digestibility if the seed is fed without processing, which is why whole seed is often bought as a raw material for further milling or pressing rather than as a finished ingredient.

Ground seed, golden or brown

Full-fat milled flaxseed gives homogeneous dosing and makes the oil accessible. The cost is stability: once the seed coat is broken, the polyunsaturated oil is exposed. Plan shorter storage, and agree granulation with the supplier, since customer-specific milling is normally available.

Press cake

After mechanical oil extraction, linseed press cake provides plant protein, fibre and residual oil in a dry, flaky structure. It is supplied as natural flakes or broken cake and is the workhorse of the group for compound feed.

Meal and finely ground cake

Coarse linseed meal is free-flowing and mixes predictably. Finely ground press cake concentrates the same fractions for low inclusion rates and homogeneous blending, with particle size set by agreement.

Oil

Cold-pressed, filtered linseed oil is a liquid raw material with the characteristic fatty acid profile of flax. It needs different handling entirely: dosing equipment, protection from light and oxygen, and shorter storage than any solid form.

Choosing between them

Three questions settle most cases. What fat level does the recipe tolerate? How long will the material sit in your silo before use? Does the ingredient need to be invisible in the finished product, or recognisable?

When comparing forms, request samples of the two or three candidates side by side. Standard samples are small, and a parallel trial answers questions about flow and stability that no comparison of specifications can settle.

A press cake is what remains after mechanical oil extraction. Unlike solvent extraction, pressing leaves part of the oil in the material, and that residual fraction is the reason press cakes behave the way they do in a formulation.

Residual oil is energy and a stability question at once

The remaining oil contributes energy density, but it also carries the fatty acid profile of the seed into your recipe. Materials rich in polyunsaturated fatty acids, linseed being the obvious example, are more prone to oxidation than a defatted meal. That affects shelf life, storage conditions and sometimes the order of addition in your process.

Ask for the residual fat range rather than assuming it. Pressing conditions differ between plants and between seasons.

Protein, fibre and oil arrive together

Press cakes are rarely single-purpose ingredients. A seed press cake typically brings plant protein, a substantial fibre fraction and residual oil in one material. That is an advantage when it matches your target, and a constraint when it does not, because you cannot adjust one fraction without moving the others.

Physical form follows the seed

Structure differs by raw material and by intended use:

• brittle cakes such as grape seed arrive as pieces or broken cake and are usually milled further
• softer materials are pelletised for handling and dosing
• speciality cakes are supplied finely ground where inclusion rates are low and homogeneity is critical

Particle size is typically adjustable by agreement. Specify it rather than accepting the default.

Speciality cakes need a defined inclusion rate

Materials such as black cumin, borage, evening primrose, milk thistle or parsley seed cake are used at low inclusion for specific purposes. They are not volume fibre carriers, and their cost per tonne reflects that. For this group, agree the inclusion rate, the target species and the intended claim with your nutritionist before ordering a contract volume.

Practical trial advice

Order a sample in the exact form you intend to use, and run it through your mixer at the planned inclusion rate. Residual oil influences flow, bridging in hoppers and the tendency to coat other components, and none of that is visible on a specification sheet.

Traceability is often reduced to a number printed on a bag. For a feed manufacturer it is something more practical: the ability to answer, within hours, which raw material went into which finished lot, and where that lot went.

What a lot number should connect

A meaningful batch identity links four stages:

1. Raw material – supplier, origin, intake documentation and the checks performed on receipt.
2. Production – process records for the run: drying parameters, size reduction, pelletising.
3. Finished lot – the analyses performed and the release decision taken against the agreed specification.
4. Dispatch – packing, labelling and the delivery the goods left on.

If any link is missing, a recall becomes a guess about quantities rather than a targeted action.

The test is a question, not a document

When qualifying a supplier, pick a lot number from a delivery you already received and ask what raw material it came from and on what date it was released. The speed and precision of the answer tells you whether the records are a working system or a folder assembled for audits.

Why it matters commercially

Traceability shortens the width of a problem. If a parameter drifts outside specification, a supplier with defined lots can tell you exactly which deliveries are affected. Without that, the safe assumption is that everything received in the period is suspect, and the cost of caution lands on your production plan.

What to agree before the first delivery

• which documents accompany each batch as standard, and which are available on request
• how long production and analytical records are retained
• the contact route for a quality question, and the expected response time
• how a change of raw material origin is communicated

None of this requires a certification logo to be useful. It requires a supplier who can describe their own process without hesitation, and who applies the same batch identity to a 25 kg sample bag as to a bulk delivery.

A certificate of analysis is not a quality guarantee. It is a record of what was measured on one defined batch, using stated methods. Reading it properly means knowing what it does not say.

Check the identity first

Before any figure, confirm three things: the batch or lot number, the production date, and that the product name on the certificate matches the material you ordered, including its form. A certificate for ground material does not describe the pelletised version of the same product.

Match parameters to your risk, not to the longest list

A long analytical list is not evidence of better quality. The relevant scope depends on the ingredient, the legal framework and your own risk assessment. For a dried fruit material used in animal nutrition, a proportionate set usually covers:

• moisture, which drives storage stability
• crude protein, fibre, fat and ash, which feed your formulation model
• microbiology, as a safety parameter
• contaminants selected on a risk basis, for example patulin for apple-derived products

Ranges beat single figures

Natural raw materials vary by crop, origin and batch. A specification that states a single number for crude fibre is either rounding heavily or describing one lot. Ask for the range your supplier commits to, and treat the certificate as confirmation that a given batch sits inside it.

Methods make values comparable

Two laboratories can return different crude fibre results on the same material using different procedures. If you compare offers from several suppliers, compare methods as well as numbers, otherwise you are ranking laboratories rather than ingredients.

Ask what happens when a batch fails

The most informative question is not on the certificate at all: what is the release decision process, and who signs it? A supplier who can describe how a non-conforming lot is blocked, and how the batch identity follows the goods to your gate, is telling you more about quality than any single analytical value.

Request the specification and a recent certificate of analysis together with your product sample. Evaluating the material and the documentation at the same time saves a round of correspondence later.

The same raw material can be delivered as flakes, meal or pellets. The choice is usually treated as a packaging detail, but it changes handling, mixing accuracy and how the ingredient behaves in the animal.

Flakes

Flakes retain the natural structure of the dried material. They are visible in the finished product, which matters in mueslis and premium consumer feeds where recognisability is part of the value. In the animal, a coarser structure means longer chewing and a slower passage rate.

The trade-off is bulk density. Flakes take more volume per tonne, which affects storage and freight cost per unit of nutrient delivered.

Meals and ground material

Milling to a defined particle size buys homogeneity. If an ingredient is added at a low inclusion rate, particle size determines whether every kilogram of finished feed actually contains its share. A material ground to 3 mm mixes predictably; the same material as flakes may segregate during transport.

Specify the granulation, not just the word ground. Suppliers can usually adjust particle size by agreement, and it is cheaper to fix this at the mill than in your mixer.

Pellets

Pelletising compacts the material into a free-flowing form, typically 6 to 12 mm depending on the product. Three consequences follow:

• Bulk density rises, so transport and storage cost per tonne falls. Hay cobs, for example, reach around 600 kg per cubic metre.
• The thermal step during pelletising reduces microbial load and opens the fibre structure.
• Dust is reduced, which improves working conditions and stall climate for bedding products.

Pellets can also be crumbled after granulation where a softer structure is wanted, for instance in small-animal bedding.

How to decide

Work backwards from the constraint that binds hardest. If it is mixing accuracy at low inclusion, specify a meal with a granulation range. If it is freight over long distances, pellets usually win. If the ingredient must be seen by the end customer, flakes earn their bulk.

Order a sample in each candidate form and run it through your own line before committing to a contract volume. Behaviour in a mixer is difficult to predict from a specification sheet.

Dried apple pomace has been a fixture in equine feed for decades, and for reasons that go beyond taste. It delivers fibre at a very low protein and starch contribution, which is exactly the combination many horse recipes need.

Fibre without starch

Apple pomace is what remains after juice pressing: skin, pulp and seed fractions. The sugars largely leave with the juice, and the dried material contains essentially no starch. For horses prone to metabolic problems, that matters more than any single nutrient value, because starch reaching the hindgut undigested is the mechanism behind several common disorders.

Typical dried apple pomace sits near 28 % crude fibre and roughly 10 % moisture, with a low crude protein contribution.

Palatability is a functional property

The characteristic fruit aroma increases acceptance, and acceptance is not a marketing argument in equine nutrition: it drives chewing, and chewing drives saliva. Saliva buffers gastric acid, which protects the stomach lining. A palatable fibre carrier therefore contributes indirectly to gastric health, not only to intake figures.

Choosing the form

• Flakes keep the visible plant structure. Useful in mueslis and wherever the horse owner should recognise the ingredient.
• Pellets, 6 or 8 mm suit industrial handling, blending and transport.
• Ground to 3 mm works where the material must disappear homogeneously into a compound feed.

Regulatory position

Dried apple pomace is a single feed material, botanically Malus spp., listed in the catalogue of feed materials under no. 5.4.1 and in the GMP+ database as a dried fruit and vegetable product, 13.040. Product supplied for animal nutrition must comply with Directive 2002/32/EC on undesirable substances in its current version.

For apple-derived materials, patulin is the contaminant worth a specific question to your supplier, since it originates from mould on the fruit before processing.

Storage

Correctly dried pomace keeps for around 24 months from production when stored cool and dry, below 25 °C and at a maximum of 70 % relative humidity. Moisture pick-up is the main risk in practice, not time on the shelf.

Crude fibre is the parameter buyers quote most often and specify least precisely. In a compound feed recipe it does three separate jobs, and only one of them is nutritional.

Fibre is structure before it is nutrition

In ruminants and horses, the fibre fraction determines chewing time, saliva production and the rate at which material leaves the stomach. A recipe can meet its energy and protein targets perfectly and still fail in practice if the fibre carrier is too finely ground to do this mechanical work.

This is why two materials with the same declared crude fibre value are not interchangeable. Dried apple pomace at around 28 % crude fibre behaves differently as flakes than it does milled to 3 mm, even when the laboratory result is identical.

Crude fibre, NDF and ADF describe different things

Crude fibre is a historical method that underestimates the total cell-wall fraction. NDF captures cellulose, hemicellulose and lignin; ADF captures cellulose and lignin. For apple pomace, typical values are roughly 28 % crude fibre, 44 % NDF and 34 % ADF.

The gap between those numbers is the hemicellulose fraction, and it matters for fermentation in the hindgut. If your formulation model works on NDF, asking a supplier only for crude fibre leaves you guessing.

What to specify when you order

A useful fibre specification names four things:

• the analytical parameter you actually formulate on, not just crude fibre
• the physical form: flakes, meal with a defined particle size, or pellets
• the acceptable range, not a single figure, because natural raw materials vary by crop and origin
• the method, since results are not comparable across different laboratory procedures

Variation is normal, undocumented variation is not

Fruit and vegetable by-products vary with harvest, variety and processing at the juice plant. That variation is inherent to natural raw materials. What a professional buyer should expect is not the absence of variation but its documentation: a specification with ranges, a certificate of analysis per batch, and a supplier able to explain which direction a given crop year moved.

If you are comparing fibre carriers for a new recipe, request a sample of each in the exact form you intend to use, and ask for the batch documentation alongside it.