Results 1 to 10 of about 1,658 (173)
Brightness Discrimination in Budgerigars (Melopsittacus undulatus)
PLoS ONE, 2013 Birds have excellent spatial acuity and colour vision compared to other vertebrates while spatial contrast sensitivity is relatively poor for unknown reasons. Contrast sensitivity describes the detection of gratings of varying spatial frequency. It is unclear whether bird brightness discrimination between large uniform fields is poor as well.
Olle Lind, Sandra Karlsson, Almut Kelber
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Edge Detection in Landing Budgerigars (Melopsittacus undulatus) [PDF]
PLoS ONE, 2009 While considerable scientific effort has been devoted to studying how birds navigate over long distances, relatively little is known about how targets are detected, obstacles are avoided and smooth landings are orchestrated. Here we examine how visual features in the environment, such as contrasting edges, determine where a bird will land.Landing in ...
Bhagavatula, Partha +3 more
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Endogenous Amino Acids in Budgerigars(Melopsittacus undulatus).
Experimental Animals, 1998 To determine the amount of endogenous amino acids in budgerigars (sekiseiinko, Melopsittacus undulatus), as the first step of evaluating amino acid requirements, three experiments were conducted. In Experiments 1 and 2, transit time of the feeds through the digestive tract in budgerigars was studied.
Yoshiyuki Ohta, Teru Ishibashi
exaly +4 more sources
Retrobulbar rhabdomyosarcoma in a budgerigar (Melopsittacus undulatus) [PDF]
Avian Pathology, 2005 This report describes a retrobulbar rhabdomyosarcoma in a 7-year-old male budgerigar (Melopsittacus undulatus). The bird was presented with orbital distension and exophthalmia of the left eye and died during surgery. Necropsy revealed a tan to grey retrobulbar mass compressing all components of the left eye with obscured vision.
Gulbahar, MY +3 more
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Cognition, personality, and stress in budgerigars, Melopsittacus undulatus [PDF]
Behavioral Ecology, 2017 To study the fitness effects of individual variation in cognitive traits, it is paramount to understand whether traits such as personality and physiological stress influence cognitive performance. We first tested whether budgerigars showed both consistent personalities and cognitive performance across time and tasks. We tested object and food neophobia,
Angela Medina-García +2 more
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Giardia Infection in Budgerigars (Melopsittacus undulatus)
The Japanese Journal of Veterinary Science, 1980 セキセイインコ4～6,000羽を飼育する愛知県の某愛玩鳥業者において, 羽毛の逆立, 飲思・食欲の減退, 削痩および下痢の症状を呈し死亡する疾病の発生が観察された. 斃死あるいは殺処理されたセキセイインコの腸内容の新鮮生標本から, ジアルディア原虫が25～58%の率で検出された. 下痢を主徴とするこの疾病の主原因はジアルディア原虫と考えられた. 原虫の治療には飲水からのジメトリダゾールが効果的であった.
HIRAI, Katsuya +4 more
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Morphology of the basilar papilla of the budgerigar, Melopsittacus undulatus [PDF]
Journal of Morphology, 1993 AbstractThe budgerigar is a representative of the parrot‐like birds that, like song birds, have developed complex communication signals. This species is interesting in a psychoacoustic sense, in that it shows unusually good frequency discriminative abilities above about 1 kHz.
Manley, Geoffrey A. +2 more
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Perception of vowels by budgerigars (Melopsittacus undulatus) [PDF]
The Journal of the Acoustical Society of America, 1989 Budgerigars (parakeets) were trained using operant conditioning techniques to respond to differences between speech stimuli. Response latencies were used to construct similarity matrices and multidimensional scaling procedures were then used to produce perceptual (spatial) maps of these stimuli.
Robert J. Dooling +3 more
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An epithelial thymoma in a budgerigar(Melopsittacus undulatus) [PDF]
Avian Pathology, 1980 An epithelial thymoma derived from a budgerigar is described. It was predominantly epithelial and possibly malignant.
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Pharmacokinetics and Tolerability of Chloramphenicol in Budgerigars(Melopsittacus undulatus).
Journal of Veterinary Medical Science, 1993 Pharmacokinetics and tolerability of chloramphenicol (CP) were evaluated in budgerigars. Following intramuscular administration of CP at 100 and 200 mg/kg of body weight, serum peak concentrations of 35.3 and 90.7 micrograms/ml, respectively, were obtained 0.25 hr following injection, and these values declined with a terminal half-life of 2.5 and 2.7 ...
ITOH, Noboru, OKADA, Hiroyuki
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