Characterization of rainbow trout egg quality: A case study using four different breeding protocols, with emphasis on the incidence of embryonic malformations
| Autor: | Alexis Fostier, Emilie Bonnet, Julien Bobe |
|---|---|
| Přispěvatelé: | Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement (SCRIBE), Institut National de la Recherche Agronomique (INRA) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Male
endocrine system Embryo Nonmammalian Time Factors [SDV]Life Sciences [q-bio] Fisheries egg quality Broodstock spawning induction Biology Breeding photoperiod 03 medical and health sciences Fish Diseases Animal science Food Animals Ovulation Induction medicine Animals [INFO]Computer Science [cs] Small Animals post-ovulatory ageing 030304 developmental biology Ovum photoperiodism fish 0303 health sciences Equine Incidence Embryo 04 agricultural and veterinary sciences Anatomy Cyclopia Animal husbandry medicine.disease Survival Analysis Confidence interval Ageing Oncorhynchus mykiss 040102 fisheries 0401 agriculture forestry and fisheries Animal Science and Zoology Rainbow trout Female |
| Zdroj: | Theriogenology Theriogenology, Elsevier, 2007, 67, pp.786-794. ⟨10.1016/j.theriogenology.2006.10.008⟩ |
| ISSN: | 0093-691X |
| DOI: | 10.1016/j.theriogenology.2006.10.008⟩ |
| Popis: | International audience; The aim of this study was to set up a methodology to accurately evaluate the effects of various husbandry practices on a fish broodstock based on the developmental potential of the egg. For that purpose, long-short photoperiod manipulations (tested twice, PM1 and PM2 groups), spawning induction by injection of a GnRH analog (SI group), and a 16-day post-ovulatory ageing of eggs (POA group) were used in rainbow trout (Oncorhynchus mykiss). Females without any treatment were used as a control group. Survival at eying (E) and yolk-sac resorption (YSR) were recorded and malformations at YSR were monitored according to a detailed typology that included cyclopia, torsion, incomplete YSR, prognathia, and others. Egg weight was also monitored. A deleterious effect of photoperiod manipulation was observed on egg quality in both PM1 and PM2 groups. Incomplete YSR appeared as the predominant malformation while cyclopia type was nearly absent. In the SI group, a limited effect on egg quality was observed in comparison to the other experimental groups, although the percentage of normal alevins at YSR was significantly lower than in the control group. Finally, the most important effects on egg quality were observed in the POA group. The percentage of normal alevins was only 14 +/- 6% (mean +/- 95% confidence interval) while the percentage of malformed embryos reached 49 +/- 11%. The proportion of cyclopia was significantly higher than in the control group. In conclusion, the type of egg quality alteration is extremely dependent on the applied breeding protocols, and the proposed methodology is able to discriminate those experimental conditions even when the impact on egg quality is limited |
| Databáze: | OpenAIRE |
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