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University of Zagreb
Faculty of Agriculture
Department of Dairy Science
The Reference laboratory
for milk and dairy products

Svetošimunska 25
10000 Zagreb, HR

T. +385 (0)1 239 3942
F. +385 (0)1 239 3988
E. rlm@agr.hr

www.agr.hr
Proficiency testing (PT)

The aim of Proficiency testing is accuracy checking of measurement results of milk, cheese, yogurt and cream analysis. We can deliver PT samples of cow (row, pasteurised and sterilised) milk, goat and sheep milk for the parameters: milk fat, protein, lactose, dry matter (basic chemical properties), urea, freezing point and somatic cell count. One PT set contains 7 samples (for milk fat, protein, lactose, dry matter, urea and freezing point), 5 samples for somatic cell count (cow milk) and 2 samples for cheese (milk fat, protein, dry matter, pH, NaCl), yogurt (milk fat, protein, dry matter, pH, lactic acid), cream (milk fat, protein, dry matter). Statistical analysis of the results is performed according to instructions given in EN ISO/IEC 17043.

You can order the PT samples by sending the Order on rlm@agr.hr at least 7 days before selected term (table with dates of delivery). The Order must contain: name and address of the company, name of the contact person, whey of delivery of the PT samples (personal taking or delivery by fast mail), DHL number (for fast mail delivery).
If you want to participate in PT for milk with results of urea and/or freezing point, please indicate that information in your Order.


Handling with PT samples

After delivery, PT milk samples must be analysed immediately or stored at the 4°C and analysed within 5 days.
Cheese samples for PT must be analysed immediately after delivery or stored at the 4°C and analysed maximally within 7 days (depending on the cheese type). Yoghurt samples must be analysed immediately after delivery or stored at the 4°C and analysed maximally within 14 days. Cream samples must be analysed immediately after delivery or stored at the 4°C and analysed maximally within 7 days.

Transport of PT samples

Buyers of reference PT samples produced in Reference laboratory for milk and dairy products (RL) can pick up the samples personally in RL and transport them in appropriate small transport refrigerators or the samples can be sent to the buyers by the fast mail in appropriate Styrofoam packaging with ice inserts.


Plan for delivery of PT samples for  2019.:

Cow milk

Goat milk

Sheep milk

23. - 24..January (1)

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-

06. February (9)

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-

20. - 21. March (2) i (5)

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-

-

17. - 18. April (4)

-

02. - 03. May (1)

-

08. - 09. May (8)

-

-

-

04. - 05.July (1)

17. - 18. July (4)

10. - 11. July

11. - 12. September (3)  

18. - 19.September (8)   

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-

-

20. - 21. November (2) i (5)

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-

11. December (9)

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-


Pasterised milk

Sterilised milk

Cheese, Cream, Yogut

04. - 05.December (6)

04. - 05. December (6)

27. - 28. February (7)

-

-

27 -28. November + butter (7)


basic chemical content: fat, protein, lactose, dry matter
(1) basic chemical content, somatic cell count, total bacterial count (Bactoscan)
(2) basic chemical content, somatic cell count, freezing point, total bacterial count (Bactoscan), total bacterial count – SPC
(3) basic chemical content, somatic cell count, total bacterial count (Bactoscan), urea
(4) basic chemical content, total bacterial count (Bactoscan)
(5) density, antibiotics
(6) basic chemical content
(7) cheese: fat, protein, dry matter, pH, NaCl;
cream: fat, protein, dry matter
yogurt: fat, protein, dry matter, pH, lactic acid
butter: fat, non fat dry matter, water
(8) basic chemical content, total bacterial count (Bactoscan), freezing point
(9) acidity: pH, °SH

 


Documents (result sheets for PT- Excel .xls format)

Results of PT density and antibiotics in milk |  Download
Results of PT determination of total bacterial count (aerobic mesofilic bacteria) in milk |  Download
Results of PT dry matter, fat, protein, NaCl and pH in Cheese |  Download
Results of PT fat, water and non-fat dry matter in Butter |  Download
Results of PT for dry matter, fat and protein in Cream|  Download
Results of PT for dry matter, fat, protein, lactic acid and pH in Yoghurt |  Download

Results of PT for fat, protein, lactose, dry matter, urea and freezing point in milk |  Download
Results of PT IBC Flow Citometry in milk |  Download
Results of PT pH, SH and alcohol test in milk |  Download
Results of PT somatic cells count in milk |  Download