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# Balancing Ca & P - PowerPoint PPT Presentation

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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Presentation Transcript

• 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!

• Dicalcium phosphate contains Ca

• Dical = 18.5% P, 22% Ca

• Limestone = 39% Ca

• 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

• 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

• 24.3 g dicalcium phosphate

• 12.95 g limestone

• If balancing using %.....

• Can’t just add dical or limestone

• Would take the total over 100%

• Need to use a dilution factor

• Dilution factor

• Allows room for ingredients that won’t contribute energy or protein

• Dilution usually ≈ 3%

• Need to increase % energy & protein balanced for

• 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

• 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

Corn 8.8% CP

27.24 parts Corn

18.56% CP

9.76 parts SBM

SBM 45.8% CP

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 %

• 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

• Calcium

• 0.7% req – 0.10% in diet – 0.20% in dical = 0.40% needed

• 0.40% / 0.39 = 1.02% limestone