scholarly journals The Heritability of Breast Blister Condition and Breast Feather Coverage in a White Rock Broiler Strain ,

1962 ◽  
Vol 41 (1) ◽  
pp. 13-17 ◽  
Author(s):  
N.R. Gyles ◽  
J. Kan ◽  
R.M. Smith
Keyword(s):  
Breast Feather

Liver and Breast Feather Mercury in Piscivorous Birds of the Caspian Sea: Monitoring Changes

2011 ◽  
Vol 86 (5) ◽  
pp. 521-524 ◽  
Author(s):  
F. Rajaei ◽  
A. Esmaili Sari ◽  
M. Savabieasfahani ◽  
N. Bahramifar ◽  
M. Ghasempouri
Keyword(s):  
Caspian Sea ◽  
The Caspian Sea ◽  
Piscivorous Birds ◽  
Breast Feather

scholarly journals Exploring Overlap of Feather Molting and Migration in Tundra Swans Using δ2H Analysis

2020 ◽  
Vol 7 (1) ◽  
pp. 58-66
Author(s):  
Nathan Wolf ◽  
T. Scott Smeltz ◽  
Jeffrey M. Welker ◽  
Matthew C. Rogers ◽  
Craig Ely
Keyword(s):  
Annual Cycle ◽  
Isotope Analysis ◽  
Satellite Tracking ◽  
Individual Variability ◽  
Relative Timing ◽  
Breeding Area ◽  
Migration Distance ◽  
Breast Feather ◽  
And Migration ◽  
Migrating Birds

AbstractDetermining the processes that shape the relative timing of energetically-costly events in the annual cycle of migrating birds is important to our understanding of avian phenology and ecology. We paired satellite tracking and hydrogen stable isotope analysis (δ2H) to examine the relative timing of two such events – migration and feather molting – in tundra swans from four breeding areas in Alaska, USA. Our results show a trend of increasing intra-individual variability in breast feather δ2H values with increasing migration distance, suggesting the overlap of breast feather molting and migration. However, when individual samples were pooled by breeding area, the δ2H values of breast and head feathers showed no trend with migration distance, presumably resulting from high levels of inter-individual variability in δ2H values within each breeding area. We explore potential reasons for this variability, propose potential mechanisms influencing feather δ2H values of tundra swans, and recommend further research into methods for exploring the temporal configuration of events in the annual cycle of migrating birds.

scholarly journals Dramatic colour changes in a bird of paradise caused by uniquely structured breast feather barbules

2010 ◽  
Vol 278 (1715) ◽  
pp. 2098-2104 ◽  
Author(s):  
Doekele G. Stavenga ◽  
Hein L. Leertouwer ◽  
N. Justin Marshall ◽  
Daniel Osorio
Keyword(s):  
Colour Change ◽  
Spectral Shift ◽  
Visual Effects ◽  
Structural Coloration ◽  
Breast Feather ◽  
Reflected Light ◽  
Single Structure ◽  
Yellow Orange ◽  
Colour Changes ◽  
Courtship Displays

The breast-plate plumage of male Lawes' parotia ( Parotia lawesii ) produces dramatic colour changes when this bird of paradise displays on its forest-floor lek. We show that this effect is achieved not solely by the iridescence—that is an angular-dependent spectral shift of the reflected light—which is inherent in structural coloration, but is based on a unique anatomical modification of the breast-feather barbule. The barbules have a segmental structure, and in common with many other iridescent feathers, they contain stacked melanin rodlets surrounded by a keratin film. The unique property of the parotia barbules is their boomerang-like cross section. This allows each barbule to work as three coloured mirrors: a yellow-orange reflector in the plane of the feather, and two symmetrically positioned bluish reflectors at respective angles of about 30°. Movement during the parotia's courtship displays thereby achieves much larger and more abrupt colour changes than is possible with ordinary iridescent plumage. To our knowledge, this is the first example of multiple thin film or multi-layer reflectors incorporated in a single structure (engineered or biological). It nicely illustrates how subtle modification of the basic feather structure can achieve novel visual effects. The fact that the parotia's breast feathers seem to be specifically adapted to give much stronger colour changes than normal structural coloration implies that colour change is important in their courtship display.

An ultrastructural study of the regenerating breast feather of the fowl

1978 ◽  
Vol 158 (3) ◽  
pp. 275-289 ◽  
Author(s):  
Roger R. Bowers ◽  
John A. Brumbaugh
Keyword(s):  
Ultrastructural Study ◽  
Breast Feather
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