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The dispersal of rodent-borne strains of Aphanoascus keratinophilus and Chrysosporium tropicum by pellets of predatory birds

Posted on 18. December, 2017.

Pathogenic species of yeast, yeast-like fungi and moulds have been recovered from faeces, feathers, beaks and cloacae as well as pellets of species of migratory and sedentary birds. Bird pellets, in particular pellets of predatory birds, are an especially suitable model for studies of circulation routes of dermatophytes and other keratinophilic fungi as they contain undigested food remains, which are rich in keratin (e.g. feathers, fur). 


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Gizzard mass dynamics of nestling Rooks Corvus frugilegus

Posted on 24. June, 2014.

In the avian digestive system, the gizzard is of key importance in processing food, but developmental changes of this organ have rarely been studied in nestlings of non-domesticated birds or under natural conditions.


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Extra-pair paternity in relation to age of the Red-breasted Flycatcher Ficedula parva males

Posted on 9. June, 2014.

In many bird species, social monogamy is widely observed but real mating systems can differ significantly from findings based on behavioural observations, especially among passerine birds.


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Non-classical signalling of growth hormone in the chick neural retina?

Posted on 24. March, 2014.

Signalling normally involves the interaction of a ligand with its receptor in target sites. 
This brief review focuses on the possibility that Growth Hormone (GH) in the neural retina of early chick embryos acts non-classically or via 'non-classical' GH-receptors.


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Relationship between glucose and pancreatic hormones during the embryonic and postnatal phase in chickens

Posted on 10. March, 2014.

Insulin plays a vital role in the regulation of glucose levels in the bloodstream. Chickens have similar circulating insulin concentrations compared to mammals but still maintain high plasma glucose levels.


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  Endangered Avian Species Captive Propagation - Free Content

Posted on 27. February, 2014.

Bird species, like plants and other animals are facing an unprecedented decline. Captive breeding as a conservation tool can be used as a substitute for wild populations in research and education, to provide demographic and genetic reservoirs for reinforcing or founding wild populations, and as a last resort for species that have no immediate opportunity for survival in nature.


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Bidirectional selection for yolk testosterone content in Japanese quail

Posted on 25. February, 2014.

The variability of hormone levels in avian eggs has often been accounted for by adaptive yolk hormone-mediated maternal effects by which the phenotype of the next generation can be adjusted to environmental conditions experienced by the mother. The environment, therefore, represents an important variable that can create variations in the relative amounts of yolk hormones.


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Avian Biology Research - Special Issue on General and Comparative Endocrinology

Posted on 19. February, 2014.

Dr. Mary Ann Ottinger, Editor of Avian Biology Research, introduces a special issue on general and comparative endocrinology.


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Collection, isolation, and culture of somatic cells from avian semen

Posted on 14. January, 2014.

Somatic cells recovered from avian semen could be used in chimera formation or cloning of endangered birds; especially important when a genetically unique animal dies and the only viable genetic material available is semen cryopreserved for artificial insemination and in vitro fertilization purposes. Although used in mammalian reproduction, this technology is lacking for avian semen. A minimally invasive technique to conserve avian genetic diversity is described that uses fresh avian semen from domestic chickens as a source of somatic cells, specifically fibroblast-like cells and epithelial cells, for cytological analysis and somatic cell gene banking.


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