Effects of a fungicide (VITAVAX 200 FF) on the reproductive-endocrine functions in mallards

P. Péczely, K. Kovács

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effects of a fungicide (VITAVAX 200 FF) were studied on the reproduction of captive mallards living in an outdoor environment. In the first experiment, the fungicide was fed (2.5 g/kg duck food) during the sexually inactive period (October-November) and in a second group at the beginning of reproduction (February-March). The plasma levels of testosterone (T), progesterone (P4) and 17-β-estradiol (E2) were measured and egg production and sexual behavior were studied in both groups. In the autumn-treated group, only males showed a decrease in T level in the spring and in P4 during the molting period. T levels in spring-treated drakes and E2 levels in females were lower than in the control during the peak of reproduction. P4 decreased only in males during molting. Egg production was lower in both the autumn- and spring-treated groups. In the second experiment, the treatment was applied at the peak of egg laying (March). Sexual steroids, gonadal weights, egg production, and sexual behavior were studied. The steroid levels showed only a slight tendency oviducts were observed. The weight of testicles, phallus, and liver was higher in treated drakes. On the basis of these results, it is possible that VITAVAX's damaging effect manifests itself as a decrease in the oogenetic function of the ovary, which is not always or immediately related to the decline of sexual steroid levels. To interpret the increase in the weight of testicles and liver in drakes needs further histological and steroid receptor studies.

Original languageEnglish
Pages (from-to)133-141
Number of pages9
JournalEnvironmental Toxicology and Water Quality
Volume13
Issue number2
DOIs
Publication statusPublished - 1998

Fingerprint

Fungicides
fungicide
steroid
Ovum
egg production
Steroids
Reproduction
Molting
Liver
sexual behavior
Weights and Measures
Sexual Behavior
Testis
Steroid Receptors
autumn
Progesterone
Oviducts
Ducks
Testosterone
Estradiol

Keywords

  • Carboxine
  • Male and female ducks
  • Seasonal effects
  • Sexual steroids
  • TMTD

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis
  • Water Science and Technology

Cite this

Effects of a fungicide (VITAVAX 200 FF) on the reproductive-endocrine functions in mallards. / Péczely, P.; Kovács, K.

In: Environmental Toxicology and Water Quality, Vol. 13, No. 2, 1998, p. 133-141.

Research output: Contribution to journalArticle

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