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

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Balancing Ca & P

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Balancing ca p

Balancing Ca & P

  • After balance for CP & energy

  • Next balance for Ca & P

  • Calculate how much supplied by diet

  • Subtract from requirements


Balancing ca p

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


Balancing ca p

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


Balancing ca p

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


Balancing ca p

Balancing Ca & P – Using Daily Amounts

  • Need to add:

  • 24.3 g dicalcium phosphate

  • 12.95 g limestone


Balancing ca p

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


Balancing ca p

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


Balancing ca p

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


Balancing ca p

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


Balancing ca p

Pearson Square Diet Balancing

Corn 8.8% CP

27.24 parts Corn

18.56% CP

9.76 parts SBM

SBM 45.8% CP


Balancing ca p

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 %


Balancing ca p

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


Balancing ca p

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


Balancing ca p

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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