thumbnail

Reproduction of bobwhites fed different dietary concentrations of an organophosphate insecticide, methamidophos

Archives of Environmental Contamination and Toxicology

By:

Links

Abstract

Pairs of first-year breeding bobwhites were fed constant or variable concentrations of methamidophos for 15 days, or a control diet in a pair-fed design in which they were matched by body weights to pairs in the constant group. Treatments for the constant group were 5.0, 7.8, 12.3, 19.2, and 30.0 ppm for 5 pairs at each concentration. The number of pairs per concentration and peak concentrations for the variable pairs were identical to the constant dosages. Concentrations for the variable group were increased by a factor of four during two 3-day periods in order to reach the peak concentrations on days 7?9 after which they were decreased by 18% every 3 days to correspond to an environmental half-time of 10.5 days. Food consumption, egg production, hatchability of eggs under artificial incubation, and survival of hatched chicks for 2 weeks were recorded for each pair during 15-day treatment and 21-day posttreatment periods. Mortality was high in the highest constant dosage (2/10) and the associated pair-fed groups (3/10). Food consumption and egg production rates were negatively dose-related during the treatment period in the constant and variable groups. The laying rate of pair-fed hens was reduced to the same extent as in the constant group. Reproductive inhibition was not permanent and pairs resumed laying after a dose-related recovery interval. No dose-related effects on hatchability or chick survival were detected. Furthermore, there was no evidence of a pesticide effect on reproduction in addition to that exerted through pesticide-induced anorexia.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Reproduction of bobwhites fed different dietary concentrations of an organophosphate insecticide, methamidophos
Series title:
Archives of Environmental Contamination and Toxicology
Volume
15
Issue:
2
Year Published:
1986
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
143-147
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
143
Last page:
147
Number of Pages:
5