260 The Effect of Different Bones and Analytical Methods on Assessment of Bone Mineralization Response to Dietary P, Phytase, and Vitamin D in Finishing Pigs

Abstract Pigs [n = 882; initial body weight (BW) of 33.2±0.31 kg] were used to evaluate the effects different bones and analytical methods on assessment bone mineralization response dietary P, phytase, vitamin D in growing-finishing pigs. Pens pigs (20 pigs/pen) completely randomized 5 treatments with 9 pens/treatment. After feeding diets for 112-d, nine pigs/treatment harvested analysis. Treatments were: 1) P at 80% NRC STTD (deficient), 2) using monocalcium phosphate, 3) including 4) Industry phosphate 5) diet 4 additional 2,000 IU/kg 25(OH)D3 (HyD). All contained 1,653 IU/kg. There no significant differences final BW, ADG, ADFI, G:F (P>0.10) or non-de-fat ash (bone ash×bone interaction, P>0.10). The treatment density (Archimedes principle) mineral content (DEXA) tended depend (density×bone P=0.053; density×bone P=0.157). between metacarpals, fibulas, 2nd ribs. For 10th ribs, fed industry levels had increased (P< 0.05) compared deficient excess from HyD being intermediate. supplemented ribs diets, without HyD, In summary, responses varied depending bone. Differences most apparent