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Balancing Ca & P

Learn how to balance Ca & P levels in animal diets considering both daily amounts & percentages. Includes calculations & strategies for precise nutritional management.

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Balancing Ca & P

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  1. Balancing Ca & P • After balance for CP & energy • Next balance for Ca & P • Calculate how much supplied by diet • Subtract from requirements

  2. Balancing Ca & P – Using Daily Amounts • Diet supplies: 9.6 g Ca & 5.5 g P • Requirements: 20 g Ca & 10 g P • Always do P first! • Dicalcium phosphate contains Ca • Dical = 18.5% P, 22% Ca • Limestone = 39% Ca

  3. Balancing Ca & P – Using Daily Amounts • Phosphorus • 10 g req – 5.5 g in diet = 4.5 g needed • 4.5 g / 0.185 = 24.3 g dical • 24.3 g dical x 0.22 = 5.35 g Ca added

  4. Balancing Ca & P – Using Daily Amounts • Calcium • 20 g req – 9.6 g in diet – 5.35 g in dical = 5.05 g needed • 5.05 g / 0.39 = 12.95 g limestone

  5. Balancing Ca & P – Using Daily Amounts • Need to add: • 24.3 g dicalcium phosphate • 12.95 g limestone

  6. Balancing Ca & P – Using Percentages • If balancing using %..... • Can’t just add dical or limestone • Would take the total over 100% • Need to use a dilution factor

  7. Balancing Ca & P – Using Percentages • Dilution factor • Allows room for ingredients that won’t contribute energy or protein • Dilution usually ≈ 3% • Need to increase % energy & protein balanced for

  8. Balancing Ca & P – Using Percentages • Example: • Balance a diet for 18% CP, 0.7% Ca and 0.5% P • Use corn & SBM • Leave room for salt (0.5%), TM (0.25%), and vitamins (0.25%) • Use a 3% dilution factor

  9. Balancing Ca & P – Using Percentages • 3% dilution means 3% of diet won’t supply any protein • So, CP requirement must be in other 97% • 18% CP / 0.97 = 18.56% CP

  10. Pearson Square Diet Balancing Corn 8.8% CP 27.24 parts Corn 18.56% CP 9.76 parts SBM SBM 45.8% CP

  11. Pearson Square Diet Balancing 27.24 parts Corn 27.24/37 x 0.97 = 71.41% Corn 9.76 parts SBM 9.76/37 x 0.97 = 25.59% SBM 37.0 Total parts 97.0 %

  12. Balancing Ca & P – Using Percentages • Same method as for amounts • Phosphorus • 0.5% req – 0.33% in diet = 0.17% needed • 0.17% / 0.185 = 0.92% dical • 0.92% dical x 0.22 = 0.20% Ca added

  13. Balancing Ca & P – Using Percentages • Calcium • 0.7% req – 0.10% in diet – 0.20% in dical = 0.40% needed • 0.40% / 0.39 = 1.02% limestone

  14. Balancing Ca & P – Using Percentages • Need to add: • 0.92% dical • 1.02% limestone • 0.5% salt • 0.25% trace minerals • 0.25% vitamins • Total = 2.94%

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