Somatotroph Pituitary Tumors in Budgerigars (Melopsittacus undulatus)
نویسندگان
چکیده
منابع مشابه
Brightness Discrimination in Budgerigars (Melopsittacus undulatus)
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. Here we show that budgerigars (Melopsittacus undulat...
متن کاملEdge Detection in Landing Budgerigars (Melopsittacus undulatus)
BACKGROUND 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. METHODOLOGY/PRINCIPAL FINDINGS Landing in ...
متن کاملExperimental toxoplasmosis in budgerigars (Melopsittacus undulatus).
The susceptibility of budgerigars (Melopsittacus undulatus) to graded doses of Toxoplasma gondii oocysts was studied. Sixteen budgerigars were divided into 4 groups (A-D) of 4 each. Birds in groups A-C were fed 100,000, 1,000, or 100 infective oocysts of the VEG strain of T. gondii, respectively. Budgerigars in group D were not fed oocysts and served as controls. All 4 birds in group A died (or...
متن کاملAuditory brainstem responses in adult budgerigars (Melopsittacus undulatus).
The auditory brainstem response (ABR) was recorded in adult budgerigars (Melopsittacus undulatus) in response to clicks and tones. The typical budgerigar ABR waveform showed two prominent peaks occurring within 4 ms of the stimulus onset. As sound-pressure levels increased, ABR peak latency decreased, and peak amplitude increased for all waves while interwave interval remained relatively consta...
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ژورنال
عنوان ژورنال: Veterinary Pathology
سال: 2011
ISSN: 0300-9858,1544-2217
DOI: 10.1177/0300985811419530