Journal of
Environmental Chemistry and Ecotoxicology

  • Abbreviation: J. Environ. Chem. Ecotoxicol.
  • Language: English
  • ISSN: 2141-226X
  • DOI: 10.5897/JECE
  • Start Year: 2009
  • Published Articles: 189

Full Length Research Paper

Effect of Dichlorvos on Reproductive Performance of Laying hens

Ethelbert Uchechukwu Ezeji
  • Ethelbert Uchechukwu Ezeji
  • Department of Biotechnology, Federal University of Technology, P.M.B. 1526 Owerri, Imo State, Nigeria.
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Angela Chika Udebuani
  • Angela Chika Udebuani
  • Department of Biotechnology, Federal University of Technology, P.M.B. 1526 Owerri, Imo State, Nigeria.
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Josephath Okereke
  • Josephath Okereke
  • Department of Biotechnology, Federal University of Technology, P.M.B. 1526 Owerri, Imo State, Nigeria.
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Sylvia Anyadoh-Nwadike
  • Sylvia Anyadoh-Nwadike
  • Department of Biotechnology, Federal University of Technology, P.M.B. 1526 Owerri, Imo State, Nigeria.
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Ikechukwu N. E. Onwurah
  • Ikechukwu N. E. Onwurah
  • Pollution Control and Biotechnology Unit, Department of Biochemistry, University of Nigeria, Nsukka, Enugu State, Nigeria.
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Kalu Obasi
  • Kalu Obasi
  • Department of Biological Science, Federal University of Technology, Owerri, Imo State, Nigeria.
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  •  Received: 21 May 2015
  •  Accepted: 22 December 2015
  •  Published: 30 April 2016

Abstract

The effect of dichlorvos on reproductive performance of laying hens was studied. Seven weeks old pullets with an average weight of 557.5 ± 9.5 g were divided into four groups and fed ad libitum with commercial poultry feeds contaminated with 0.01, 0.02 and 0.04% dichlorvos (w/v). The group without dichlorvos served as the control. Exposure to dichlorvos was continued until nine weeks after the hens started laying eggs. There was a significant reduction (p<0.05) in feed intake between the control group and those exposed to dichlorvos.  Egg laying was delayed in the hens exposed to the pesticide by as much as eighteen weeks. The ages of the hens at first egg  lay were 18 weeks for the control, 23 weeks for hens fed on 0.01 and 0.02% contaminated diet and 36 weeks for those fed on 0.04% contaminated diet. The average daily egg production was reduced from 5 eggs in the control group to 1 egg in 0.04% contaminated group. The protein contents of the egg (yolk and egg-white) and cholesterol level of the egg yolk were lowered in birds exposed to dichlorvos. There was no significant difference in the weight of eggs between the control and those exposed to pesticide. Results of this study suggest that exposure of laying hens to dichlorvos could affect their reproductive success.

Key words: Dichlorvos, reproductive success, sexual maturity, egg laying hens.