Egg turning during incubation has no effect upon the growth of embryos of Alligator mississippiensis

Deeming, Charles and Ferguson, M. W. J. (1991) Egg turning during incubation has no effect upon the growth of embryos of Alligator mississippiensis. Acta Zoologica, 72 (3). pp. 125-128. ISSN 0001-7272

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Alligator eggs are not turned during incubation, instead the embryo adheres to the top inside of the shell. Turning is alleged to shear off the embryo and kill it. Avian egg turning allegedly facilitates embryonic development by stimulating growth of the area vasculosa and minimizing the effects of unstirred yolk and albumen layers.

From day 10 to day 45 of incubation, alligator eggs were experimentally turned, gently, through ± 60° in an hourly cycle. This turning regime killed only 6 out of 25 embryos. Compared with unturned controls, no significant effects were observed on the growth, production of extraembryonic fluids or utilization of albumen and yolk for those embryos that survived turning. The protein concentration of amniotic fluid at various stages of alligator development was examined in eggs incubated at 30 and 33°C. The fluid contained very little protein (max <8 mg) at any time: the protein concentration did not change consistently as development progressed. Differences in response to egg turning in birds and reptiles may be associated with the length of the incubation period, the protein content of the albumen and the mechanism of albumen utilization.

Keywords:Egg turning, Incubation, Alligator mississippiensis, embryo growth
Subjects:C Biological Sciences > C142 Reproductive Biology
D Veterinary Sciences, Agriculture and related subjects > D300 Animal Science
Divisions:College of Science > School of Life Sciences
ID Code:13198
Deposited On:29 Jan 2014 15:29

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