Acta Biologica Hungarica
Volume/Issue:
Volume 57: Issue 1
Effect of testosterone loading on the kinetic of faecal testosterone excretion in mallards
Authors: Zsuzsa Szőke 1 , Éva Váradi 2 , K. Kelemen 3 , A. Biczó 4 , and P. Péczely 5
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  • 1 Dept. Poultry Reproduction, Institute for Small Animal Research Gödöllő, Hungary
  • 2 Lab. Reproductive Biology, Szent István University Gödöllő, Hungary
  • 3 Lab. Reproductive Biology, Szent István University Gödöllő, Hungary
  • 4 Lab. Reproductive Biology, Szent István University Gödöllő, Hungary
  • 5 Lab. Reproductive Biology, Szent István University Gödöllő, Hungary
DOI:
https://doi.org/10.1556/abiol.57.2006.1.2
Page Count:
13–21
Publication Date:
01 Mar 2006
Online Publication Date:
28 Feb 2006
Article Category:
Research Article
Restricted access

Intestinal passage time of coloured fodder and testosterone turnover were examined by faecal steroid analysis in mallards in the reproductive and postrefractory period. In the latter, the discharge of coloured fodder began 36 minutes after ingestion in males, and 56 minutes in females. During reproduction the discharge began 93 minutes and 112 minutes after ingestion in males and females, respectively. Total passage time was similar in the reproductive and postrefractory period in both sexes. After intraperitoneal testosterone injection, faecal samples were collected for 8 hours and testosterone levels were measured using RIA. In the postrefractory period, 1-2 hours after testosterone loading a strong increase of faecal testosterone content developed in males, meanwhile a slighter testosterone peak appeared in females. During reproduction testosterone excretion began 1.5-2 hours after injection in both sexes but in females its increase was smaller. The duration of response to testosterone loading was 5 hours in both periods and both sexes. Intensive excretion after T loading appeared earlier in males than in females, but total passage time finished at the same time: 5 hours after loading. The character of testosterone excretion was corresponding to the passage of fodder-chimus-faeces in the reproductive and postrefractory period in both sexes.

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Cover Acta Biologica Hungarica
Acta Biologica Hungarica
Print ISSN:
0236-5383
Online ISSN:
1588-256X
Keywords:
T loading - faecal T - fodder purging time - mallard

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