Dairy and dairy processing

The most expensive mistake in a dairy happens at the reception bay. A tanker held at the bay is one load; a tanker pumped into a silo puts its problems into everything the silo feeds. Antibiotic residue from a single treated animal can kill starter cultures across a full day of fermented production — GSO 2481 sets the veterinary drug MRLs that apply to milk. Added water shows in freezing-point depression before it shows anywhere else.

Composition — fat, protein, solids-not-fat — settles what you pay the supplier and how you standardise the batch. Reception screening is fast by design; confirmatory work on a failed screen goes to the laboratory, and the acceptance decision waits for it.

Antibiotic residues

Screened at reception against GSO 2481 veterinary drug MRLs

Added water

Freezing-point depression

Composition

Fat, protein, solids-not-fat — payment and standardisation

A rejected tanker costs one load. An accepted one costs the silo — and everything downstream of it.

Pasteurisation is the one control the whole chilled chain leans on, and a chart recorder only proves the plate pack saw the right temperature — not that the product left clean. The verification is microbiological: indicator counts on product after the pasteuriser, run against the criteria in GSO 1016:2015. Indicators recover where pathogens are rare, so they show a marginal process or post-process contamination — a leaking plate, a dirty filler — while the counts are still small enough to act on. Pathogen testing sits alongside, not instead.

Aflatoxin M1 is the dairy-specific contaminant risk. It starts as aflatoxin B1 in contaminated feed, is metabolised by the animal and carried into the milk — and it survives pasteurisation, so no step in your process removes it. The only management is feed control upstream and surveillance testing on the milk itself.

SFDA.FD CAC 193 is the regulatory anchor for contaminants and toxins in food in Saudi Arabia. Where a specific limit applies to your product and market, the laboratory confirms the applicable limit in writing before testing, so the result lands next to the number that decides it.

A chilled dairy site is cold, wet and rich in nutrients — exactly the environment Listeria monocytogenes prefers. Drains, filler surrounds, chiller condensate and wet floors are where it establishes, and a finished-product test will not find it there: it describes the batch it came from, nothing more. An environmental programme samples the building on a zoned plan — highest scrutiny closest to exposed product — and trends each point over time, so a harbourage near a filler is found weeks before it reaches a pack. Whether a given determination falls inside the laboratory’s SAAC-accredited scope is confirmed in writing at quotation, and the report states it against each result.

A chilled shelf life is a claim you have to be able to defend on the day someone challenges it. SFDA.FD 150-1 and SFDA.FD/GSO 150-2 govern expiry dating; the defence is a shelf-life study — product held at its intended storage temperature and tested at intervals until the data, not habit, sets the date.

The same discipline applies to the front and back of pack. GSO 9:2022 governs general labelling and GSO 2750:2024 governs the nutritional declaration; compositional analysis of the product as sold is what ties the printed numbers to reality. This is not legal advice — it is where testing sits inside the rules.

Expiry dating

SFDA.FD 150-1 and SFDA.FD/GSO 150-2

General labelling

GSO 9:2022

Nutritional declaration

GSO 2750:2024