About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 35 No. 3, p. 701-706
     
    Received: Aug 5, 2005


    * Corresponding author(s): pghartel@uga.edu
 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2134/jeq2005.0303

Mineralization of Hormones in Breeder and Broiler Litters at Different Water Potentials and Temperatures

  1. Sarah N. J. Hemmingsa and
  2. Peter G. Hartel *b
  1. a Institute of Ecology
    b Department of Crop & Soil Sciences, 3111 Plant Sciences, University of Georgia, Athens, GA 30602-7272

Abstract

When poultry litter is landspread, steroidal hormones present in the litter may reach surface waters, where they may have undesirable biological effects. In a laboratory study, we determined the mineralization of [4–14C]-labeled 17β-estradiol, estrone, and testosterone in breeder litter at three different water potentials (−56, −24, and −12 MPa) and temperatures (25, 35, and 45°C), and in broiler litter at two different water potentials (−24 and −12 MPa) and temperatures (25 and 35°C). Mineralization was similar in both litters and generally increased with increasing water content and decreasing temperature. After 23 wk at −24 MPa, an average of 27, 11, and <2% of the radiolabeled testosterone applied to breeder litter was mineralized to 14CO2 at 25, 35, and 45°C, respectively. In contrast, mineralization of the radiolabeled estradiol and estrone was <2% after 25 wk at all water potentials, except after 17 wk at 25°C and −12 MPa, where up to 5.9% of the estradiol and 7.8% of the estrone was mineralized. The minimal mineralization suggests that the litters may still be potential sources of hormones to surface and subsurface waters.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2006. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA