Photoperiodism in the avian species
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چکیده
منابع مشابه
Photoperiodism in Pigs
Andersson, H. 2000. Photoperiodism in pigs. Studies on timing of male puberty and melatonin. Doctoral thesis ISSN 1401-6257, ISBN 91-576-5901-X. The routine castration of male piglets, which is performed in many countries to avoid boar taint in meat, is a cause for great concern in terms of animal welfare. Castrates also have reduced feed efficiency and more fat than do entire males. More of th...
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I n mammals, photoreception is restricted to the eye. By contrast, nonmammalian vertebrates possess photoreceptors in a wide array of extraocular tissues, including the pineal complex and brain (1). The identity of the deep brain photoreceptors has remained elusive. They continue to be the least studied of all nonvisual photoreceptor classes, although their existence in the vertebrates has been...
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GENETIC DIVERSITY IS CONSIDERED crucial to the continued survival of a species, be it wild or domestic. Such within-species diversity has been the raw material of agriculturists over millennia. In response to selective breeding and the differential survival of less fit animals, preferred traits have been accentuated and clustered to produce distinct breeds and varieties of the modern domesticat...
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ژورنال
عنوان ژورنال: Nihon Chikusan Gakkaiho
سال: 1970
ISSN: 1346-907X,1880-8255
DOI: 10.2508/chikusan.41.171