Results 1 to 10 of about 45,975 (246)

The flight feather moult pattern of the bearded vulture (Gypaetus barbatus). [PDF]

open access: green, 2016
Moult is an extremely time-consuming and energy-demanding task for large birds. In addition, there is a trade-off between the time devoted to moulting and that invested in other activities such as breeding and/or territory exploration. Moreover, it takes
A Adam   +43 more
core   +3 more sources

Moult-Induced Changes in Gut Microbiota of African Penguins (Spheniscus demersus) [PDF]

open access: yesAnimals
The gut microbiota of seabirds can undergo shifts during the moulting period due to fasting. Understanding the characteristics of gut microbiota in African penguins (Spheniscus demersus) throughout moulting is meaningful for the conservation and ...
Jingle Jiang   +5 more
doaj   +2 more sources

Divergent primary moult-A rare moult sequence among Western Palaearctic passerines.

open access: yesPLoS ONE, 2017
Wing morphology strongly affects flight performance which may consequently decline during feather moult due to the creation of feather gaps in the wing. Hence, the size and shape of moult-related wing gap may directly affect flight capacity.
Yosef Kiat
doaj   +4 more sources

Body Characteristics, Performances and Protein Metabolism in Hy-Line Brown Hens Subject of Natural Moult

open access: yesBulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca: Veterinary Medicine, 2022
The paper aimed to present the evolution of food intake, body weight, laying performance, mortality, ovary and oviduct weight and protein metabolism in 63-week-old natural moulted Hy-Line var. Brown hens housed in industrial system.
Cristiana GENES   +3 more
doaj   +2 more sources

Differences in phenology across three trophic levels between two Afrotropical sites separated by four degrees latitude [PDF]

open access: yesEcology and Evolution
Birds time their life cycle events to favourable windows in environmental conditions. In tropical environments, where photoperiod variation is small, birds show high variability in the timing of life cycle stages, yet these species have been severely ...
Crinan Jarrett   +10 more
doaj   +2 more sources

Ethological investigation on moulting laying hens in organic farming [PDF]

open access: green, 2005
Introduction Organic egg farmers mainly rely on the same hybrids, breeding techniques and production schemes as conventional egg producers. This includes annual replacement of the laying hens.
Hirt, Helen, Zeltner, Esther
core   +2 more sources

Diet of moulting Swainson's Thrushes (Catharus ustulatus) and Tennessee Warblers (Leiothlypis peregrina) at a stopover site during fall migration measured with fecal DNA metabarcoding [PDF]

open access: yesScientific Reports
Moult and migration are energetically demanding and require adequate nutrition. In some species, individuals may interrupt their fall migration to moult at discrete stopover locations outside of their breeding grounds (i.e., moult-migration) leading to ...
Ana Blanc-Benigeri   +4 more
doaj   +2 more sources

Moult intensity constraints along the complete moult sequence of the House Sparrow (Passer domesticus)

open access: yesAvian Research, 2023
Sequence and intensity are two essential components of bird moult. While the moult sequences of remex tracts are highly homogenous across passerines, other tracts apparently show a high variability.
Santi Guallar, Javier Quesada
doaj   +1 more source

The effects of temperature on photoperiodic responses: implications for climate change [PDF]

open access: yes, 2010
Migratory birds regularly perform impressive long-distance flights, which are timed relative to the anticipated environmental resources at destination areas that can be several thousand kilometres away.
Dawson, Alistair, Visser, Marcel E.
core   +14 more sources

Moult Strategies Affect Age Differences in Autumn Migration Timing in East Mediterranean Migratory Passerines. [PDF]

open access: yesPLoS ONE, 2016
Adult passerines renew their flight feathers at least once every year. This complete moult occurs either in the breeding areas, just after breeding (summer moult), or, in some long-distance migratory species, at the non-breeding areas, after arrival to ...
Yosef Kiat, Ido Izhaki
doaj   +1 more source

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