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

Tuesday, June 28, 2022

4:45 PM – 5:00 PM CT

Location: Oklahoma City Convention Center, Ballroom A

Presenting Author(s)

Hadley Williams

Graduate Research Assistant
Kansas State University
Manhattan, Kansas

Author(s)

JG

Jordan T. Gebhardt

Kansas State University
Manhattan, KS
Mike D. Tokach

Professor
Kansas State University
Manhattan, KS
JW

Jason C. Woodworth

Kansas State University
Manhattan, KS
Joel M. DeRouchey

Professor, Swine Extension Specialist
Kansas State University
Manhattan, KS
RG

Robert D. Goodband

Professor
Kansas State University
Manhattan, KS
Jon R. Bergstrom, PhD

Sr. Technical Support Manager, Swine
DSM
Parsippany, NJ
CH

Chad W. Hastad

Swine Nutritionist
New Fashion Pork
Jackson, MN
ZP

Zach Post

New Fashion Pork
Jackson, MN
MR

Michael Rahe

Iowa State University
Ames, IA
CS

Christopher Siepker

Iowa State University
Ames, IA
PS

Panchan Sitthicharoenchai

Iowa State University
Ames, IA
SE

Steve Ensley

Kansas State University
Manhattan, KS

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