N. A. French

Aviagen Ltd, Newbridge, Midlothian EH28 8SZ, UK. Email: Questo indirizzo email è protetto dagli spambots. E' necessario abilitare JavaScript per vederlo. In 1990, Tullett suggested that the basic principles of artificial incubation were well understood and that poultry hatcheries were generally getting good results; future studies would just be a fine-tuning the process.

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Barbara Tzschentke and Sabrina Tatge*

Humboldt-University of Berlin, Institute of Biology, Philippstr. 13, 10115 Berlin, Germany

‘Imprinting’ describes a fundamental process of life, which occurs during ‘critical periods’ of embryonic or early postnatal development and has effects that last into adult life and possibly over generations. It is probably realized by neuronal plasticity, as well as by a lasting, environment-induced (epigenetic) modification of the genome. A ‘critical period’ for the ‘imprinting’ of body functions is the development of feed back mechanisms, which occurs during the perinatal period. During this period the actual level at which physiological parameters are active may pre-determine a life-long ‘set point’ (or ‘set ranges’) for the respective regulatory system.

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M. Marzoni*, A. Castillo and I. Romboli

Department of Physiological Sciences, Faculty of Veterinary, Pisa University
Viale delle  Piagge 2 - 561241 (PI), Italy
*Email: Questo indirizzo email è protetto dagli spambots. E' necessario abilitare JavaScript per vederlo.

It is well known that avian spermatozoa are sensitive to lipid peroxidation due to the kind of phospholipids that form their membrane. Consequently protection against peroxidation, especially during the freezing-thawing procedure is necessary to maintain the structural integrity of the spermatozoa.

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