Re-Engineering Calcium Delivery for Variable Fresh-Food Diets: A Low-Phosphorus Calcium Architecture for Canine and Feline Nutritional Balancers

This is version 1. A corrected and expanded version of this record has been published. Cite the concept DOI 10.5281/zenodo.22647608, which always resolves to the current version. This paper presents the material-science rationale, structural mechanics and mass-balance outcomes of a re-engineering of the calcium delivery system used in a precision micronutrient corrector for home-prepared cat and dog diets. Micronutrient balancers conventionally satisfy the calcium requirement — as published by the NRC [3] — with bone-derived microcrystalline hydroxyapatite. Because bone hydroxyapatite carries a fixed stoichiometry of approximately 24% calcium and 11.5% phosphorus, adding it to a boneless fresh-meat base — which is already phosphorus-replete — force-feeds mineral phosphorus into the matrix, raising the very denominator the calcium is meant to balance and locking in a fixed phosphorus load the owner cannot reduce. The release-B-2.0.0 architecture resolves this by moving the adult maintenance correction to a mineral-phosphorus-free eggshell base paired with a retained soluble calcium salt system (calcium lactate-gluconate and calcium citrate-malate), with no soluble inorganic phosphate salt present. Mass-balance data document a structural phosphorus displacement of −61% for the dog correction (865 → 333 mg/day) and −64% for the cat correction (409 → 147 mg/day) at the validation anchors, with delivered calcium-to-phosphorus ratios re-solved to 1.38 and 1.41 and total calcium-system mass reduced by approximately 38% and 52% respectively. The delivered calcium target is unchanged; what changed is the mass and the phosphorus carried in delivering it. {{CHART:phosphorus|Correction-borne phosphorus before and after re-basing the calcium system. Replacing bone-derived hydroxyapatite with eggshell plus soluble calcium salts removes 61% of the phosphorus the correction contributes for dogs and 64% for cats, at the validation anchors, while the delivered calcium target is unchanged.}} The consequence is architectural rather than clinical: the diet moves from a correction-dominated to a diet-governed phosphorus model, so total-bowl phosphorus tracks the owner's protein selection and can be titrated at the bowl without the correction pushing against it. The growth corrections deliberately retain bone hydroxyapatite, and the paper states why, together with the composition of the reproduction co-blend that follows from the same reasoning.