Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Donald R. Powers"'
Autor:
Grace A.T. Hong, Bret W. Tobalske, Nienke van Staaveren, Emily M. Leishman, Tina Widowski, Donald R. Powers, Alexandra Harlander-Matauschek
Publikováno v:
Poultry Science, Vol 103, Iss 3, Pp 103375- (2024)
ABSTRACT: Domestic laying hens rely primarily on their hindlimbs for terrestrial locomotion. Although they perform flapping flight, they appear to use maximal power during descent and thus may lack control for maneuvering and avoiding injuries on lan
Externí odkaz:
https://doaj.org/article/d9d4c969ba0c4de18cb0f7cca4a5290a
Autor:
Grace A. T. Hong, Bret W. Tobalske, Nienke van Staaveren, Emily M. Leishman, Tina M. Widowski, Donald R. Powers, Alexandra Harlander-Matauschek
Publikováno v:
Royal Society Open Science, Vol 10, Iss 11 (2023)
In flying birds, the pectoralis (PECT) and supracoracoideus (SUPRA) generate most of the power required for flight, while the wing feathers create the aerodynamic forces. However, in domestic laying hens, little is known about the architectural prope
Externí odkaz:
https://doaj.org/article/796649d621e8445a9a7531394ab39f86
Autor:
Renée C. Garant, Bret W. Tobalske, Neila Ben Sassi, Nienke van Staaveren, Dan Tulpan, Tina Widowski, Donald R. Powers, Alexandra Harlander-Matauschek
Publikováno v:
Royal Society Open Science, Vol 10, Iss 1 (2023)
Domestic chickens may live in environments which restrict wing muscle usage. Notably, reduced wing activity and accompanying muscle weakness are hypothesized risk factors for keel bone fractures and deviations. We used radio-frequency identification
Externí odkaz:
https://doaj.org/article/ad5361f340cc4db3b2094c91a49adf49
Autor:
Renée Garant, Bret W. Tobalske, Neila Ben Sassi, Nienke van Staaveren, Tina Widowski, Donald R. Powers, Alexandra Harlander-Matauschek
Publikováno v:
Royal Society Open Science, Vol 9, Iss 6 (2022)
Feather loss in domestic chickens can occur due to wear and tear, disease or bird-to-bird pecking. Flight feather loss may decrease wing use, cause pectoral muscle loss and adversely impact the keel bone to which these muscles anchor. Feather loss an
Externí odkaz:
https://doaj.org/article/c7d604eb848748bbb938ae1de7522055
Autor:
Renée Garant, Bret W. Tobalske, Neila BenSassi, Nienke van Staaveren, Dan Tulpan, Tina Widowski, Donald R. Powers, Alexandra Harlander-Matauschek
Publikováno v:
Royal Society Open Science, Vol 9, Iss 3 (2022)
Ground-dwelling species of birds, such as domestic chickens (Gallus gallus domesticus), experience difficulties sustaining flight due to high wing loading. This limited flight ability may be exacerbated by loss of flight feathers that is prevalent am
Externí odkaz:
https://doaj.org/article/627462fa87b0470ba633f5469c1c8935
Autor:
S. R. Supp, Frank A. La Sorte, Tina A. Cormier, Marisa C.W. Lim, Donald R. Powers, Susan M. Wethington, Scott Goetz, Catherine H. Graham
Publikováno v:
Ecosphere, Vol 6, Iss 1, Pp 1-19 (2015)
Current rates of global environmental and climate change pose potential challenges for migratory species that must cope with or adapt to new conditions and different rates of change across broad spatial scales throughout their annual life cycle. Nort
Externí odkaz:
https://doaj.org/article/c975c720ee5f46bda944b6e96766378b
Autor:
Donald R. Powers, Kathleen M. Langland, Susan M. Wethington, Sean D. Powers, Catherine H. Graham, Bret W. Tobalske
Publikováno v:
Royal Society Open Science, Vol 4, Iss 12 (2017)
At high temperature (greater than 40°C) endotherms experience reduced passive heat dissipation (radiation, conduction and convection) and increased reliance on evaporative heat loss. High temperatures challenge flying birds due to heat produced by w
Externí odkaz:
https://doaj.org/article/633b354d2e0a4491be399f233f832e73
Publikováno v:
Royal Society Open Science, Vol 3, Iss 6 (2016)
We present a computational study of flapping-wing aerodynamics of a calliope hummingbird (Selasphorus calliope) during fast forward flight. Three-dimensional wing kinematics were incorporated into the model by extracting time-dependent wing position
Externí odkaz:
https://doaj.org/article/af6b26ae77224f45a29e0d6aa83dd57e
Publikováno v:
Royal Society Open Science, Vol 2, Iss 12 (2015)
Flying animals generate large amounts of heat, which must be dissipated to avoid overheating. In birds, heat dissipation is complicated by feathers, which cover most body surfaces and retard heat loss. To understand how birds manage heat budgets duri
Externí odkaz:
https://doaj.org/article/69a4b5291ed84649a028a500cff10c40
Autor:
Anusha Shankar, Isabelle N. H. Cisneros, Sarah Thompson, Catherine H. Graham, Donald R. Powers
Publikováno v:
Journal of Experimental Biology. 225
Many endotherms use torpor, saving energy by a controlled reduction of their body temperature and metabolic rate. Some species (e.g. arctic ground squirrels, hummingbirds) enter deep torpor, dropping their body temperature by 23–37°C, while others
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9d178ffb9f874a7c5e7e724927b422a
https://doi.org/10.1242/jeb.243208
https://doi.org/10.1242/jeb.243208