QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal 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 Google Scholar Google Scholar Articles by Wedekind, K. J. Articles by Baker, D. H. Search for Related Content PubMed PubMed Citation Articles by Wedekind, K. J. Articles by Baker, D. H.

Phosphorus, but not Calcium, Affects Manganese Absorption and Turnover in Chicks¹

Departments of Animal Sciences ^* Veterinary Biosciences, University of Illinois, Urbana, IL 61801

Two balance studies with growing chicks were conducted to evaluate the effects of excess Ca or excess P on endogenous fecal Mn excretion and true Mn absorption. An isotope-dilution technique was used to estimate endogenous manganese in excreta. Supplements were added to a com-soybean diet containing 1% Ca, 0.7% P (0.5% available P) and 37 mg Mn/kg. In Experiment 1, supplemental Ca levels of 0, 0.5 and 1.0% from feedgrade limestone were compared. True absorption of Mn was not affected by Ca level (P > 0.10) and averaged 2.8% for birds fed the Mn-unsupplemented diet. In Experiment 2, a 2 x 3 factorial arrangement of treatments included: 100 and 1000 mg/kg supplemental Mn (from MnSO₄·H₂O) and 0, 0.4 and 0.8% added P supplied by dicalcium phosphate. Excess P significantly decreased true absorption of Mn (P < 0.01). In birds fed 100 mg/kg supplemental Mn, absorption of Mn decreased 22% as excess P increased from 0 to 0.8%, whereas in birds fed 1000 mg/kg supplemental Mn, Mn absorption decreased 59% as a result of 0.8% P supplementation. These results confirm that the antagonism of Mn by inorganic P is due to reduced gut absorption of Mn.

KEY WORDS: • manganese • phosphorus • calcium • isotope-dilution • chicks

¹ Part of a dissertation submitted by Karen J. Wedekind to the Graduate College, University of Illinois, in partial fulfillment of the requirements for the Ph.D. degree in Animal Sciences.

² Present address: Mark Morris Associates, 5500 SW 7th Street, Topeka, KS 66606.

³ To whom reprint requests should be addressed: 328 Mumford Hall, 1301 West Gregory Drive, University of Illinois, Urbana, IL 61801.

Manuscript received 14 December 1990. Revision accepted 6 May 1991.

This article has been cited by other articles:

				P. R. Ferket, E. O. Oviedo-Rondon, P. L. Mente, D. V. Bohorquez, A. A. Santos Jr., J. L. Grimes, J. D. Richards, J. J. Dibner, and V. Felts Organic trace minerals and 25-hydroxycholecalciferol affect performance characteristics, leg abnormalities, and biomechanical properties of leg bones of turkeys, Poult. Sci., January 1, 2009; 88(1): 118 - 131. [Abstract] [Full Text] [PDF]

				S. P. Bai, L. Lu, X. G. Luo, and B. Liu Kinetics of Manganese Absorption in Ligated Small Intestinal Segments of Broilers Poult. Sci., December 1, 2008; 87(12): 2596 - 2604. [Abstract] [Full Text] [PDF]

				J. J. Dibner, J. D. Richards, M. L. Kitchell, and M. A. Quiroz Metabolic Challenges and Early Bone Development J. Appl. Poult. Res., January 1, 2007; 16(1): 126 - 137. [Abstract] [Full Text] [PDF]

				N. Zagorski Profile of David H. Baker PNAS, February 28, 2006; 103(9): 3020 - 3022. [Full Text] [PDF]

				D. H. Baker Inaugural Article: Comparative nutrition and metabolism: Explication of open questions with emphasis on protein and amino acids PNAS, December 13, 2005; 102(50): 17897 - 17902. [Abstract] [Full Text] [PDF]