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 18.56% CP Corn 8.8% CP SBM 45.8% CP 27.24 parts Corn 9.76 parts SBM

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