→ fat determined using butyrometric method: 6 samples with fat varying from 60 to 90 g/l
→ fat determined using the extraction ethero-ammoniacal (or ethero-chlorhydric) method or alternative methods (NMR): 6 samples with varying from 58 to 87 g/kg
→ true protein determined using the Amido black method: 6 samples with protein varying from 45 to 65 g/l
→ total and non-protein nitrogen determined using the Kjeldahl, Dumas or any other method:
- total nitrogen: 6 samples with nitrogen ranging from 6.5 to 10 g N/l
- non-protein nitrogen: 3 samples of milk (NPN about 0.2 to 0.3 g N/l)
- 1 tryptophan solution,
- 1 glycine solution,
- 1 ammonium sulphate solution,
in which the nitrogen concentration is equivalent to that of milk
→ freezing point determined using the cryoscopic method: 6 samples with freezing point varying from -0.550 to -0.480 °C + 2 standard NaCl solutions for calibration
→ dry matter (any method): 10 samples with dry matter varying from 16 to 21 g/100 g
- 1 set of 6 samples which are the same for the Gerber and Amido black methods
- 1 set of 6 samples which are the same for the Kjeldahl and Röse-Gottlieb methods
- 1 set of 6 samples which are the same for the determination of dry matter and cryoscopic measurements
- 60 ml polyethylene screw-capped vials with airtight seals for all the other criteria
- 30 ml polyethylene screw-capped vials with airtight seals for all the other criteria for cryoscopic, nitrogen and non-protein nitrogen solutions
addition of Bronopol to the samples (final concentration: 0.02 %) (except for Kjeldahl and cryoscopic solutions)
in insulated box with ice packs by express carrier (see regulation for shipping times)
at 4 (± 2) °C
testing must be carried out within 10 days after the date of dispatch
| Sample dispatch | 2025/03/24 | 2025/09/29 |
| Return of results to ACTALIA Cecalait | 2025/04/03 | 2025/10/09 |
Subscription at least 10 days before each dispatch
| Members | Non-members | |
|---|---|---|
| Registration fees per shipment | 69.83 € | 104.37 € |
| Participation fee per tested method | 69.83 € | 104.37 € |
| Nitrogen + NPN (Supplement) | 13.82 € | 20.73 € |
within 1 month of receiving invoice
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ACTALIA Cecalait
Rue de Versailles
BP 70129
39801 POLIGNY CEDEX
FRANCE
Tel : +33 (0)3 84 73 63 20
Fax : +33 (0)3 84 73 63 29
Accreditation no 1-5577, tests, no 1-2473 interlaboratory comparisons, scope available on www.cofrac.fr/en
