«Growing kittens require adequate levels of calcium and phosphorus for proper bone development and growth.» (petbusiness.com)
[64] Furthermore, the ratio of calcium and phosphorus must be balanced and at a recommended ratio of 1.2:1 to ensure proper bone development and structure. (en.wikipedia.org)
Added glucosamine and chondroitin for healthy joints for growing puppy's that need proper bone development, along with older dogs that have arthritis. (lbah.com)