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Hypoxia is a naturally occurring environmental challenge for embryonic reptiles, and this is the first study to investigate the impact of chronic hypoxia on the in ovo development of autonomic cardiovascular regulation and circulating catecholamine levels in a reptile. We measured heart rate (f(H)) and chorioallantoic arterial blood pressure (MAP) in(More)
Domesticated animals tend to develop a coherent set of phenotypic traits. Tameness could be a central underlying factor driving this, and we therefore selected red junglefowl, ancestors of all domestic chickens, for high or low fear of humans during six generations. We measured basal metabolic rate (BMR), feed efficiency, boldness in a novel object (NO)(More)
Since most animal species have been recognized as sentient beings, emotional state may be a good indicator of welfare in animals. The goal of this study was to manipulate the environment of nine beagle research dogs to highlight physiological responses indicative of different emotional experiences. Stimuli were selected to be a more or a less positive food(More)
Analysis of selective sweeps to pinpoint causative genomic regions involved in chicken domestication has revealed a strong selective sweep on chromosome 4 in layer chickens. The autoregulatory α-adrenergic receptor 2C (ADRA2C) gene is the closest to the selective sweep and was proposed as an important gene in the domestication of layer chickens. The ADRA2C(More)
Bird incubation demands a balance between parental needs for foraging with fetal needs for heat provision and protection so that any means of communication between the fetus and the parents would have an adaptive value. The aim of the study was to investigate whether putative avenues of feto-maternal communication would correlate to physiological changes(More)
Linköping Paper I-III are reprinted with permission from the respective publishers. " Do not rest after your first victory because if you fail in the second, lips are waiting to say that your first victory was just luck "-A. ABSTRACT Internal fertilization occurs in birds and eutherian mammals. Foetal development, however, is either extra-respectively(More)
The ability of the heart and skeletal muscles to remodel to environmental demands, their plasticity, is of interest when studying animals' adaptation to environment changes. Temperature variation due to seasonal change seems to lead to the development of a cold acclimated phenotype in small birds. To endure cold conditions a higher metabolism is required(More)
Fetal cardiac growth in mammalian models occurs primarily by cell proliferation (hyperplasia). However, most cardiomyocytes lose the ability to proliferate close to term and heart growth continues by increasing cell size (hypertrophy). In mammals, the thyroid hormone triiodothyronine (T3) is an important driver of this process. Chicken cardiomyocytes,(More)