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ARS Home » Midwest Area » Ames, Iowa » National Animal Disease Center » Ruminant Diseases and Immunology Research » Research » Publications at this Location » Publication #76692
Title: INABILITY OF 1,25-DIHYDROXYCHOLECALCIFEROL TO IMPROVE P UTILIZATION IN PIGS

Author
item CROMWELL, GARY - UNIV. KENTUCKY, LEXINGTON
item Horst, Ronald
item Goff, Jesse
item CARTER, S - UNIV. KENTUCKY, LEXINGTON
item LINDEMANN, M - UNIV. KENTUCKY, LEXINGTON
item MONEGUE, H - UNIV. KENTUCKY, LEXINGTON

Submitted to: American Dairy Science Association Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 6/23/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Three 35-d trials were conducted with pigs (14-21 kg initial wt) to determine if 1,25-dihydroxycholecalciferol (D3) improves the utilization of phytate in low-P diets, as has been shown in chicks. Corn-soy diets (.90% lysine) were fed to 5 or 6 pigs/trt (1 or 2 pigs/pen) in each trial. In Exp. 1, 7 diets were fed: (1) .65% Ca/.50% P; (2, 3, 4) .65% Ca/.32% P + 0, 5, or 10 ug/kg D3,; and (5, 6, 7) .32% Ca/.32% P + 0, 5, or 10 ug/kg D3. Growth rate decreased (P<.01) when dietary P was reduced (717 vs 573 g/d), but to a lesser extent when Ca also was reduced (649 g/d). Bone (avg, femur and metatarsal) breaking strength was reduced (P<.01) by lowering P (148, 72, 69, 83, 75, 81, 70 kg, respectively), but it was not affected by lowering Ca or by adding D3. Added D3 did not affect plasma Ca (11.0, 12.3, 12.8, 12.7, 11.3, 11.2, 11.4 mg/dl), but it tended to increase plasma P (9.4, 5.6, 5.9, 5.8, 7.2, 7.7, 7.5 mg/dl). In Exp. 2, 8 diets were fed: (1) .65% Ca/.55% P; (2, 3, 4) .42% Ca/.42% P + 0, 25, or 50 ug/kg D3; (5, 6, 7) .32% Ca/.32% P + , 25, or 50 ug/kg D3; and (8) .16% Ca/.32% P + 50 ug/kg D3. Reducing Ca/P affected bone strength (133, 100, 93, 81, 46, 49, 48, 53 kg) more than growth rate (581, 598, 565, 532, 500, 528, 467, 554 g/d), and D3 had modest effects on both traits. Plasma Ca and P were (mg/dl): 10.9, 11.2, 11.3, 11.6, 10.5, 10.7, 11.4, 10.9, 9.0, 8.3, 8.0, 8.2, 5.0, 5.5, 5.7, 7.1.