Buscar
Mostrando ítems 11-20 de 37
Effect of maternal environment on yolk immunoreactive corticosterone and its influence on adrenocortical and behavioral activity in chicks of Greater Rhea (Rhea americana)
(Elsevier, 2019-08)
Maternal corticosterone in avian eggs may modify offspring phenotype in order to increase survival in poor environments. In the Greater Rhea (Rhea americana), we previously found that yolk immunoreactive corticosterone is ...
Analysis of ancient DNA from South American rhea bones: Implications for zooarchaeology and biogeography
(Elsevier, 2019-06)
Rheas have been an important food source to human communities in South America, providing meat and especially eggs, and thus playing a crucial role in the development of South American societies. Two extant species currently ...
Presencia de Rhea americana en sitios arqueológicos vinculados a los ambientes ribereños del sistema Paraná-Paraguay (Argentina)Presence of Rhea americana in archaeological sites linked to the Paraguay and Paraná rivers (Argentina)
(Centro de Estudios Históricos "Profesor Carlos S.A. Segreti", 2021-12)
En este trabajo se evalúa, desde una perspectiva regional, la presencia-ausencia de Rhea americana en diversos conjuntos arqueológicos del Holoceno tardío vinculados a los ambientes ribereños del sistema Paraná-Paraguay ...
Behavioral responses to short-term transport in male and female Greater rheas (Rhea 7 americana) reared in captivity
(Poultry Science Assoc Inc, 2013-04)
Animal transport is an indispensable practice in species that need to be moved for<br />management or commercial purposes. However, transport may have negative effects on individuals? welfare. The aims of the present work ...
Genetic structure of Greater Rhea (Rhea americana) populations in two regions with different land-uses in central Argentina
(Csiro Publishing, 2009-09)
The distribution of populations of Greater Rhea (Rhea americana) are fragmented, probably owing to the conversion of grasslands to croplands. This study analyses the genetic structure of populations of Greater Rhea in areas ...
Effect of antipredator training on spatial behaviour of male and female Greater Rheas (Rhea americana) reintroduced into the wild
(Museum & Inst Zoology, 2018-07-01)
The Greater Rhea (Rhea americana) is a South-American flightless bird whose populations have decreased due to poaching and fragmentation of suitable habitats, and there has been an urgent need to carry out management ...
¿Difiere la probabilidad de eclosión de los huevos de ñandú (Rhea americana), según su ubicación dentro de la incubadora?
(Asociación Argentina de Producción Animal, 2007-12)
Actualmente, los principales problemas en criaderos de Ñandú (Rhea americana) son las bajas tasas de eclosión y de supervivencia de pichones. Con el propósito de mejorar los resultados de la incubación artificial, es ...
Yolk immunoreactive corticosterone does not relate with maternal fecal glucocorticoids in a captive population of Greater Rheas (Rhea americana)
(Springer, 2020-10)
Maternal corticosterone in avian egg yolks may signal and prepare offspring for the prevailing conditions. However, this adjustment requires flexible mechanisms of regulation that lead to the absence of a correlation between ...
May captive populations of Greater Rhea (Rhea americana) act as genetic reservoirs in Argentina?
(Wiley-liss, Div John Wiley & Sons Inc, 2011-01)
The Greater Rhea (Rhea americana) is a characteristic bird of the Argentine Pampas. Despite the increasing farming interest of this ratite, their natural populations are progressively decreasing in size and range. The ...
Effects of Greater rhea (Rhea americana) female attributes on egg viabilityEfectos de los atributos de la hembra de ñandú (Rhea americana) sobre la viabilidad del huevo
(Asociación Argentina de Producción Animal, 2019-05)
We conducted a study throughout a breeding season in a captive-bred population of Greater rheas (Rhea americana) to evaluate the association between egg viability and the female´s body weight and age. A total of 180 eggs ...