HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by Plumstead, P. W. Articles by Brake, J. Search for Related Content PubMed PubMed Citation Articles by Plumstead, P. W. Articles by Brake, J.

Interaction of Calcium and Phytate in Broiler Diets. 1. Effects on Apparent Prececal Digestibility and Retention of Phosphorus¹

P. W. Plumstead^*, A. B. Leytem, R. O. Maguire, J. W. Spears, P. Kwanyuen^# and J. Brake^*,2

^* Department of Poultry Science, North Carolina State University, Raleigh 27695-7608; USDA, Agricultural Research Service, Northwest Irrigation and Soils Research Laboratory, 3793 N 3600 E, Kimberly, ID 83341-5076; Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061; Department of Animal Science, North Carolina State University, Raleigh 27695-7621; and ^# USDA, Agricultural Research Service, Soybean and Nitrogen Fixation Research Unit, 3271 Ligon Street, Raleigh, NC 27607

² Corresponding author: jbrake{at}ncsu.edu

Phytate P utilization from soybean meal (SBM) included in broiler diets has been shown to be poor and highly dependent on dietary Ca intake. However, the effect of Ca on P utilization and on the optimal ratio of Ca to nonphytate P (Ca:NPP) when diets contained varying levels of phytate has not been clearly shown and was the objective of this research. A factorial treatment structure was used with 4 dietary Ca levels from 0.47 to 1.16% and 3 levels of phytate P (0.28, 0.24, and 0.10%). Varying dietary phytate P levels were obtained by utilizing SBM produced from 3 varieties of soybeans with different phytate P concentrations. Ross 508 broiler chicks were fed 1 of 12 diets from 16 to 21 d of age. Excreta were collected from 16 to 17 d and from 19 to 20 d of age and ileal digesta was collected at 21 d of age. Apparent prececal P digestibility decreased when dietary Ca concentration increased and was higher when diets contained low-phytate SBM. The apparent digestibility of Ca and percentage of phytate P hydrolysis at the distal ileum were not reduced when dietary phytate P concentration increased. Including low-phytate SBM in diets reduced total P output in the excreta by 49% compared with conventional SBM. The optimum ratio of Ca:NPP that resulted in the highest P retention and lowest P excretion was 2.53:1, 2.40:1, and 2.34:1 for diets with 0.28, 0.24, and 0.10% phytate P. These data suggested that increased dietary Ca reduced the extent of phytate P hydrolysis and P digestibility and that the optimum Ca:NPP ratio at which P retention was maximized was reduced when diets contained less phytate P.

Key Words: broiler • phosphorus • soybean meal • phytate • environment

¹ The use of trade names in this publication does not imply endorsement of the products mentioned nor criticism of similar products not mentioned.

This article has been cited by other articles:

				A. B. Leytem, P. W. Plumstead, R. O. Maguire, P. Kwanyuen, J. W. Burton, and J. Brake Interaction of Calcium and Phytate in Broiler Diets. 2. Effects on Total and Soluble Phosphorus Excretion Poult. Sci., March 1, 2008; 87(3): 459 - 467. [Abstract] [Full Text] [PDF]