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

This Article Figures Only Full Text Free Full Text (PDF) Free 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 Maguire, R. O. Articles by Brake, J. Search for Related Content PubMed PubMed Citation Articles by Maguire, R. O. Articles by Brake, J. Agricola Articles by Maguire, R. O. Articles by Brake, J. Related Collections Spatial Distribution Sustainable Agriculture Animal Waste Nutrient Management Phosphorus

TECHNICAL REPORTS

Waste Management

Impact of Diet, Moisture, Location, and Storage on Soluble Phosphorus in Broiler Breeder Manure

^a Department of Soil Science, North Carolina State University, Raleigh, NC 27695
^b Department of Poultry Science, North Carolina State University, Raleigh, NC 27695

^* Corresponding author (rory_maguire{at}ncsu.edu)

Received for publication November 21, 2005. Decreasing dietary phosphorus (P) has the potential to reduce P excreted in manure and therefore alleviate the environmental degradations associated with intensive animal farming. We evaluated reducing dietary P for broiler breeders as an aid to reduce manure total and water soluble phosphorus (WSP). Broiler breeders were fed diets high and low in dietary P, with and without phytase, from 22 to 64 wk of age. At the end of the 42-wk production period, manure was collected from four locations in each two-thirds slat, one-third litter breeder pen: the litter scratch area, under the drinker in the slat area, under the feeder in the slat area, and in a clean area of the slat area away from feeder or drinker. After the initial sampling, all manure was removed from pens and representative samples were stored for 6 mo with and without feed mixed in to simulate the effect of spilled feed. Total P was determined on all pen samples, and moisture and WSP determined on the pen and stored samples. The manure collected under the drinker had much greater moisture due to spilled water. This was associated with much greater WSP in this location, showing the importance of good water management. The manure from under the feeder had similar WSP as manure from the clean area, so spilled feed did not significantly affect WSP. Dietary phytase either had no effect or significantly decreased manure WSP. However, addition of dietary phytase to the feed led to slightly elevated manure moisture. Since moisture was correlated with manure WSP this may explain some of the variability in WSP results between studies. Over 6 mo of storage WSP increased and generally followed the same ranking order at 168 d as at 1 d among the dietary treatments (high > high + phytase > low > low + phytase). Combining decreased dietary P and phytase reduced both manure total P and WSP by 42%. As total P and WSP are indicators of the long and short term impacts manure applications can have on P losses from manured soils, diet modification should be seen as environmentally beneficial.

Abbreviations: AvP, dietary available phosphorus • HAP, high available phosphorus • NPP, non-phytate phosphorus • WSP, water soluble phosphorus

This article has been cited by other articles:

				P. W. Plumstead, H. Romero-Sanchez, R. O. Maguire, A. G. Gernat, and J. Brake Effects of Phosphorus Level and Phytase in Broiler Breeder Rearing and Laying Diets on Live Performance and Phosphorus Excretion Poult. Sci., February 1, 2007; 86(2): 225 - 231. [Abstract] [Full Text] [PDF]