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 landing. This in turn may result in injury in open rearing systems. Wing-assisted incline running (WAIR) requires a bird to use its wings to assist the hindlimbs during climbing of an incline, and training in WAIR may therefore provide a useful method to increase a hen's power reserve and control for flight. We subjected hens to an exercise regimen involving inclines to induce WAIR for 16 wk during rearing. We then measured wing and body kinematics during aerial descent from a 155 cm platform. We hypothesized that birds reared with exercise would be better able to modulate their wing and body kinematics for making slower, more-controlled descent and landing. Brown-feathered birds exhibited greater wing beat frequencies than white-feathered birds, which is consistent with the higher wing loading of brown-feathered birds and WAIR-trained birds exhibited greater initial flight velocities compared to control birds. This may indicate that WAIR training provided an improved capacity to modulate flight velocity and strengthen the leg muscles. Providing incline exercises during rearing may therefore improve welfare for adult laying hens as greater initial flight velocity should reduce the power required for supporting body weight in the air and allow a hen to direct her excess power toward maneuvering.
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http://dx.doi.org/10.1016/j.psj.2023.103375 | DOI Listing |
Anal Chem
December 2024
Research Center of Analytical Instrumentation, School of Mechanical Engineering, Sichuan University, Chengdu 610065, People's Republic of China.
In ambient mass spectrometry, the performance in direct in situ analysis applications has been hindered by the lack of efficient ion-transferring technique between the atmosphere pressure ionization source and the mass analyzer. Building upon the hybrid concept of a stack ring ion guide and multipole ion guide, this study proposes the concept of a reconfigurable twisted dipole ion guide (TDIG) that enables flexible ion transfer between atmosphere and vacuum. Initially, theoretical and numerical studies were conducted to understand the basic ion confining principle of the twisted dipole ion guide, revealing its unique merits in long-distance flexible ion transmission.
View Article and Find Full Text PDFPLoS One
December 2024
Laboratorio Clínico, Clínica Alemana, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile.
Filamentous fungi are an emergent cause of severe infections in immunocompromised patients. Timely and accurate identification is crucial to initiate appropriate therapy. Traditional identification methods are time-consuming, labor-intensive, and operator-dependent.
View Article and Find Full Text PDFJ Geriatr Phys Ther
December 2024
Department of Public Health, University of Southern Denmark, Odense, Denmark.
Background And Purpose: Targeted interventions to maintain physical performance in older adults are important. We aimed to validate an existing 4-item prediction model and, if necessary, develop a new model for early identification of adults aged 65+ with persistent reduced physical performance.
Methods: A temporal validation study on adults aged 65+ admitted to the emergency department for medical reasons and who performed ≤8 repetitions in the 30-second chair-stand test (30s-CST) within the first 48 hours of admission.
Aerosp Med Hum Perform
December 2024
Introduction: Military pilots are subjected to unique pulmonary demands, particularly in high performance jets. The hypobaric environment necessitates use of on-board oxygen, breathing masks, and regulators to increase oxygen pressure, affecting ventilation and breathing responses. Safety features like pilot flight equipment and strapping into an ejection seat further impact pilot pulmonary function.
View Article and Find Full Text PDFRisk Anal
December 2024
School of Vehicle and Mobility, Tsinghua University, Beijing, China.
Multifarious applications of unmanned aerial vehicles (UAVs) are thriving in extensive fields and facilitating our lives. However, the potential third-party risks (TPRs) on the ground are neglected by developers and companies, which limits large-scale commercialization. Risk assessment is an efficacious method for mitigating TPRs before undertaking flight tasks.
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