Forage Analysis Procedures

Section B - Procedures for Proficiency Testing

• Introduction
• 2. Dry Matter Determination
  • 2.1 Single Step Total Dry Matter Determinations
    • 2.1.1 Total Dry Matter by Oven Drying for 2 hr at 135°C
    • 2.1.2 Total Dry Matter by Oven Drying at 100°C for 24 hr or 105°C for 16 hr
    • 2.1.3 Total Dry Matter by Microwave Drying to Constant Weight
  • 2.2 Two Step Total Dry Matter Determination of Wet Samples
    • 2.2.1 Partial Drying of Wet Samples
      • 2.2.1.1 Partial Dry Matter Using Forced-air Drying Ovens
      • 2.2.1.2 Partial Dry Matter Using Microwave Oven
    • 2.2.2 Laboratory Dry Matter of Partially-Dried Samples
      • 2.2.2.1 Laboratory Dry Matter by Oven Drying for 2 hr at 135°C
      • 2.2.2.2 Laboratory Dry Matter by Oven Drying at 100°C for 24 hr or 105°C for 16 hr
      • 2.2.2.3 Laboratory Dry Matter by Microwave Drying to Constant Weight
      • 2.2.2.4 Dry Matter by Near Infrared Reflectance Spectroscopy
    • 2.2.3 Determination of Sample Total Dry Matter using the Two-step Procedure
  • 2.3 Wet, Fermented Samples
    • 2.3.1 Toluene Determination of Moisture
• 3. Nitrogen and Crude Protein Determination
  • 3.1 Nitrogen Determination by Kjeldahl
  • 3.1A Addendum to Nitrogen Determination by Kjeldahl (Rack):
    Options for Experienced Laboratories
    • 3.1.1 Standardization of Hydrochloric Acid Standard Solution
    • 3.1.2 Standardization of Sodium Hydroxide Standard Solution
  • 3.2 Nitrogen Determination by Kjeldahl (Block Digestion)
  • 3.3 Nitrogen Determination by Combustion Method
  • 3.4 Crude Protein by Near Infrared Reflectance Spectroscopy
• 4. Acid Detergent Fiber
  • 4.1 Determination of Acid Detergent Fiber by Refluxing
  • 4.2 Determination of Acid Detergent Fiber by Near Infrared Reflectance Spectroscopy

   

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