NEW ZEALAND GAZETTE

No. 36

volume if the herd is milked other than twice daily,
and

• based on a representative sample of the 24 hour milk production, the fat%, protein %, and the somatic cell concentration, or
• any other characteristics that may be required.

Dated 31st day of March 1994.

The Common Seal of New Zealand Dairy Board was hereunto affixed in the presence of:

D. T. SPRING, Director.

T. H. GIBSON, Director.

J. B. MURRAY, Secretary.

APPENDIX I

TECHNICAL SPECIFICATIONS

The following specifications shall generally be required to be met for equipment to be considered for approval for use and inclusion to the schedule of approved equipment.

1. Milk Meters

Target Accuracy for Total Yield (in litres to one decimal point) for each animal shall be:

95% of milk yield measurements to be within ± 7.5%

99% of milk yield measurements to be within ± 10%.

The first requirement has been interpreted as ± 7.5% where the true volume is 4.0 litres or more, and ±300 grams where the true volume is less than 4.0 litres.

The target accuracy shall be maintained under the following conditions:

(i) flow rates between 0.5 litres/min and 9.0 litres/min, that exist for at least two minutes.

(ii) air pipeline vacuum levels between 36 and 56 kPa.

(iii) air admission rates between 4 and 12 litres/min, with a milk flow rate of 3 litres/min and air pipeline vacuum level of 50 kPa.

(iv) standard deviation for subsampler errors less than 0.05% units.

(v) meter tilt of ± 5 degrees in forward, back, left, and right directions, with a milk flow of 3 litres/min.

(vi) the meter should perform to requirement on all types of installations when fitted in accordance with the manufacturer's instructions.

Yield Range

The measuring range for total yield shall not be less than 0 - 20 litres.

Hygiene Requirements

Surfaces of the meter which come in to contact with milk and wash water/chemicals shall be of materials which conform with the requirements of MAFQAL hygiene specifications.

The materials used for the meter shall be capable of repeatedly sustaining a continuous temperature of 95 degrees C for a period of three minutes, without affecting accuracy during subsequent milkings or causing visible deterioration of materials.

2. Component Sampling Accuracy

Target accuracy for subsample measurement shall be:

(i) within ± 0.1% for milkfat and/or protein units of the reference sample for 95% of all measurements.

(ii) within ± 0.2% for milkfat and/or protein units of the reference sample for 99% of all measurements.

(iii) subsampler bias less than ±0.1% for milkfat and/or protein units compared with the reference sample.

3. Component Analysis Accuracy

*Cv = Coefficient of variation (standard deviation divided by average value of samples tested).

Reference methods: Rose-Gottlieb. Kjeldahl calibrated analysis.

Somatic Cells

Measuring range ... up to 10,000,000 cells/ml

Repeatability (relative SD)

• 4% at 500,000 cells/ml
• 5% at 300,000 cells/ml
• 6% at 100,000 cells/ml

Accuracy (rel. mean diff. from direct microscopic count DMC) ... Typically better than 10% in the range 100,000 to 1,500,000 cells/ml

Correlation to DMC ... 0.96 - 0.99

LIST OF APPROVED EQUIPMENT

Milk Meters

• TruTest
  Models – F.V.
  H.I.
  F.C. 5.6/ML/L
  F.C. 7.7/ML/L

• Carter Holt Harvey
  Model – Waikato Mark 3

Sampling Devices

• Pipette
• Southby Probe
• MMB Dipper

Analysis Equipment

• Fat, protein, lactose and total solids

  • Foss Milkoscan
    Models – * 203
    • 300
    • 605
    • 133
    • 303
      *4000

• Somatic Cells

  • Coulter Counter
  • Fossomatic
    Models – 450
    180
    215
    360
    90
    300