Physiological aspects of oviposition and its role in egg quality. A review
2004
Ebeid, T. | Tumova, E. (Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Chovu Prasat a Drubeze)
This review article describes the biochemical regulation of oviposition in domestic birds, especially layer hens, as well as factors affecting the time of oviposition and egg quality. The regulation of oviposition is under the influence of multiple factors including arginine vasotocin and prostaglandin F2alpha which promote the contractile activity of the shell gland muscle. The time of oviposition is strongly affected by light regime, ovulation, hormones and stress factors. As both ovulation and oviposition are controlled by LH they are strongly related to each other. The negative effect of stress is due to the release of epinephrine suppressing uterine contractions and thus delaying the time of oviposition. Egg weight and eggshell quality vary according to the time of oviposition and bird species. In hens, eggs laid in the morning are heavier than those laid later during the day, but the shell quality is better in eggs laid in the afternoon. In Japanese quail, no such effect was observed.
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