Understanding avian egg cuticle formation in the oviduct: a study of its origin and deposition† - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biology of Reproduction Année : 2017

Understanding avian egg cuticle formation in the oviduct: a study of its origin and deposition†

Résumé

The cuticle is a unique invisible oviduct secretion that protects avian eggs from bacterial penetration through gas exchange pores. Despite its importance, experimental evidence is lacking for where, when, and what is responsible for its deposition. By using knowledge about the ovulatory cycle and oviposition, we have manipulated cuticle deposition to obtain evidence on these key points. Cuticle deposition was measured using staining and spectrophotometry. Experimental evidence supports the location of cuticle deposition to be the shell gland pouch (uterus), not the vagina, and the time of deposition to be within the final hour before oviposition. Oviposition induced by arginine vasotocin or prostaglandin, the penultimate and ultimate factors for the induction of oviposition, produces an egg with no cuticle; therefore, these factors are not responsible for cuticle secretion. Conversely, oviposition induced by GNRH, which mimics the normal events of ovulation and oviposition, results in a normal cuticle. There is no evidence that cuticle deposition differs at the end of a clutch and, therefore, there is no evidence that the ovulatory surge of progesterone affects cuticle deposition. Overall, the results demonstrate that the cuticle is a specific secretion and is not merely an extension of the organic matrix of the shell. Cuticle deposition was found to be reduced by an environmental stressor, and there is no codependence of the deposition of pigment and cuticle. Defining the basic facts surrounding cuticle deposition will help reduce contamination of hen's eggs and increase understanding of the strategies birds use to protect their eggs.
Fichier principal
Vignette du fichier
iox070_1.pdf (1.39 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01604749 , version 1 (27-05-2020)

Licence

Paternité

Identifiants

Citer

Peter W. Wilson, Ceara S. Suther, Maureen M. Bain, Wiebke Icken, Anita Jones, et al.. Understanding avian egg cuticle formation in the oviduct: a study of its origin and deposition†. Biology of Reproduction, 2017, 97 (1), ⟨10.1093/biolre/iox070⟩. ⟨hal-01604749⟩
150 Consultations
30 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More