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Standardized total tract digestible phosphorus requirement of 6 to 13 kg pigs fed diets without or with phytase

Published online by Cambridge University Press:  22 May 2019

F. Wu Open the ORCID record for F. Wu [Opens in a new window] ,
J. C. Woodworth ,
M. D. Tokach ,
S. S. Dritz ,
J. M. DeRouchey ,
R. D. Goodband  and
J. R. Bergstrom
F. Wu*
Affiliation:
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506, USA
J. C. Woodworth
Affiliation:
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506, USA
M. D. Tokach
Affiliation:
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506, USA
S. S. Dritz
Affiliation:
Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA
J. M. DeRouchey
Affiliation:
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506, USA
R. D. Goodband
Affiliation:
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS 66506, USA
J. R. Bergstrom
Affiliation:
DSM Nutritional Products Inc., Parsippany, NJ 07054, USA
*
†Email: fangzhou@ksu.edu
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Abstract

Dietary phosphorus concentration greatly affects pig’s growth performance, environmental impact and diet cost. A total of 1080 pigs (initially 5.9 ± 1.08 kg) from three commercial research rooms were used to determine the effects of increasing standardized total tract digestible (STTD) P concentrations in diets without and with phytase on growth performance and percentage bone ash. Pens (10 pigs/pen, 9 pens/treatment) were balanced for equal weights and randomly allotted to 12 treatments. Treatments were arranged in two dose titrations (without or with 2000 units of phytase) with six levels of STTD P each. The STTD P levels were expressed as a percentage of NRC (2012) requirement estimates (% of NRC; 0.45 and 0.40% for phases 1 and 2, respectively) and were: 80%, 90%, 100%, 110%, 125% and 140% of NRC in diets without phytase and 100%, 110%, 125%, 140%, 155% and 170% of NRC in diets with phytase. Diets were provided in three phases, with experimental diets fed during phases 1 (days 0 to 11) and 2 (days 11 to 25), followed by a common diet from days 25 to 46. On day 25, radius samples from one median-weight gilt per pen were collected for analysis of bone ash. During the treatment period, increasing STTD P from 80% to 140% of NRC in diets without phytase improved average daily gain (ADG; quadratic, P < 0.01), average daily feed intake (ADFI; quadratic, P < 0.05) and gain–feed ratio (G : F; linear, P < 0.01). Estimated STTD P requirement in diets without phytase was 117% and 91% of NRC for maximum ADG according to quadratic polynomial (QP) and broken-line linear (BLL) models, respectively, and was 102%, 119% and >140% of NRC for maximum G : F using BLL, broken-line quadratic and linear models, respectively. When diets contained phytase, increasing STTD P from 100% to 170% of NRC improved ADG (quadratic, P < 0.05) and G : F (linear, P < 0.01). Estimated STTD P requirement in diets containing phytase was 138% for maximum ADG (QP), and 147% (QP) and 116% (BLL) of NRC for maximum G : F. Increasing STTD P increased (linear, P < 0.01) the percentage bone ash regardless of phytase addition. When comparing diets containing the same STTD P levels, phytase increased (P < 0.01) ADG, ADFI and G : F. In summary, estimated STTD P requirements varied depending on the response criteria and statistical models and ranged from 91% to >140% of NRC (0.41% to >0.63% of phase 1 diet and 0.36% to >0.56% of phase 2 diet) in diets without phytase, and from 116% to >170% of NRC (0.52% to >0.77% of phase 1 diet and 0.46% to >0.68% of phase 2 diet) for diets containing phytase. Phytase exerted an extra-phosphoric effect on promoting pig’s growth and improved the P dose-responses for ADG and G : F.

Keywords

bone ashgrowth performancenursery pigsphosphorusphytase
Type
Research Article
Information
animal , Volume 13 , Issue 11 , November 2019 , pp. 2473 - 2482
Copyright
© The Animal Consortium 2019 

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