Poult. Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Shirley, R.
Right arrow Articles by Edwards, H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Shirley, R.
Right arrow Articles by Edwards, H., Jr
Poultry Science, Vol 82, Issue 4, 671-680
Copyright © 2003 by Poultry Science Association

Articles

Graded levels of phytase past industry standards improves broiler performance

RB Shirley and HM Edwards Jr

Department of Poultry Science, University of Georgia, Athens, Georgia 30602-2772, USA.

This study evaluated the overall performance of 0-to-16-d-old, mixed-sex, Cobb x Cobb broiler chicks when dietary phytase levels were supplemented in excess of industry standards. The experimental diet used consisted of a basal corn-soybean meal diet that contained an analyzed 22.2% CP, 0.88% Ca, a deficient total P (tP) level of 0.46% (phytate P = 0.272%), and calculated ME of 3.123 kcal/g diet on an as-is basis. In addition to a positive control diet [0.70% tP], the dietary phytase levels evaluated were 0, 93.75, 187.5, 350, 750, 1,500, 3,000, 6,000, and 12,000 U/kg of diet. Supplementing phytase from 0 to 12,000 U significantly increased body weight gain from 287 to 515 g/chick, feed intake from 381 to 595 g/chick, gain to feed from 0.755 to 0.866, plasma P from 2.5 to 7.1 mg/100 mL, tibia ash from 26 to 41%, tibia ash weight from 0.200 to 0.601 g/tibia, tP retention from 51 to 80%, phytate P disappearance from 40% to 95%, apparent N retention from 58 to 78%, AMEn from 3,216 to 3,415 kcal/kg diet, and reduced P rickets from 80 to 3%. Using nonlinear regression analysis on log-transformed phytase levels, gain to feed, apparent N retention, and AME, responded linearly with respective R2 values of 0.76, 0.82, and 0.72, whereas body weight gain, feed intake, plasma P, P rickets, tP retention, phytate P disappearance, tibia ash percentage, and tibia ash weight responded quadratically with respective R2 values of 0.93, 0.88, 0.85, 0.84, 0.91, 0.96, 0.96, and 0.98. Few statistical differences existed between response data for broilers consuming the positive control diet or diets containing 1,500 to 12,000 U of phytase (P > 0.05). This finding indicates that broilers consuming a tP-deficient corn-soybean meal diet can achieve maximum performance when phytase is supplemented to 12,000 U/kg diet and that current phytase supplementation levels within the poultry industry may need to be reevaluated.


This article has been cited by other articles:


Home page
 Poult. Sci.Home page
W. Powers and R. Angel
A Review of the Capacity for Nutritional Strategies to Address Environmental Challenges in Poultry Production
Poult. Sci., October 1, 2008; 87(10): 1929 - 1938.
[Abstract] [Full Text] [PDF]

Home page
 Poult. Sci.Home page
E. K. D. Nyannor and O. Adeola
Corn Expressing an Escherichia Coli-Derived Phytase Gene: Comparative Evaluation Study in Broiler Chicks
Poult. Sci., October 1, 2008; 87(10): 2015 - 2022.
[Abstract] [Full Text] [PDF]

Home page
 Poult. Sci.Home page
M. K. Manangi and C. N. Coon
Phytate Phosphorus Hydrolysis in Broilers in Response to Dietary Phytase, Calcium, and Phosphorus Concentrations
Poult. Sci., August 1, 2008; 87(8): 1577 - 1586.
[Abstract] [Full Text] [PDF]

Home page
 Poult. Sci.Home page
M. A. Leslie, E. T. Moran Jr., and M. R. Bedford
The Effect of Phytase and Glucanase on the Ileal Digestible Energy of Corn and Soybean Meal Fed to Broilers
Poult. Sci., November 1, 2007; 86(11): 2350 - 2357.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
E. K. D. Nyannor, P. Williams, M. R. Bedford, and O. Adeola
Corn expressing an Escherichia coli-derived phytase gene: A proof-of-concept nutritional study in pigs
J Anim Sci, August 1, 2007; 85(8): 1946 - 1952.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
N. R. Augspurger, D. M. Webel, and D. H. Baker
An Escherichia coli phytase expressed in yeast effectively replaces inorganic phosphorus for finishing pigs and laying hens
J Anim Sci, May 1, 2007; 85(5): 1192 - 1198.
[Abstract] [Full Text] [PDF]

Home page
 Poult. Sci.Home page
P. B. Pillai, T. O'Connor-Dennie, C. M. Owens, and J. L. Emmert
Efficacy of an Escherichia coli Phytase in Broilers Fed Adequate or Reduced Phosphorus Diets and Its Effect on Carcass Characteristics.
Poult. Sci., October 1, 2006; 85(10): 1737 - 1745.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
A. K. Kies, P. A. Kemme, L. B. J. Sebek, J. Th. M. van Diepen, and A. W. Jongbloed
Effect of graded doses and a high dose of microbial phytase on the digestibility of various minerals in weaner pigs
J Anim Sci, May 1, 2006; 84(5): 1169 - 1175.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Poult. Res.Home page
M. K. Manangi and C. N. Coon
Evaluation of Phytase Enzyme with Chicks Fed Basal Diets Containing Different Soybean Meal Samples
J. Appl. Poult. Res., January 1, 2006; 15(2): 292 - 306.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
N. R. Augspurger and D. H. Baker
High dietary phytase levels maximize phytate-phosphorus utilization but do not affect protein utilization in chicks fed phosphorus- or amino acid-deficient diets
J Anim Sci, April 1, 2004; 82(4): 1100 - 1107.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2003 by the Poultry Science Association.