Results 131 to 140 of about 1,658 (173)

Sleep patterns in the parakeet Melopsittacus undulatus

Physiology & Behavior, 1989
Electrophysiological and behavioral studies of vigilance states were performed on adult specimens of the parakeet Melopsittacus undulatus. Four states of vigilance were identified: Wakefulness, drownsiness, slow wave sleep and paradoxical sleep. During wakefulness, a low voltage fast EEG pattern was observed.
openaire   +2 more sources

Seminal plasma composition in budgerigars (Melopsittacus undulatus)

Comparative Biochemistry and Physiology Part A: Physiology, 1986
Seminal plasma composition was studied in budgerigars. Semen was obtained from adult male budgerigars by applying gentle pressure to both sides of the cloaca. Pooled samples were centrifuged at 15,000 g for 2 min, and the seminal plasma separated for biochemical analysis. Osmolality, Na+, K+, Cl-, pH, glucose and fructose values were determined.
J H, Samour, G K, Baggott, G, Williams, I T, Bailey, P F, Watson   +4 more
openaire   +2 more sources

Uric Acid Ingluviolith in a Budgerigar (Melopsittacus undulatus)

Journal of Avian Medicine and Surgery
This clinical report describes an adult, female budgerigar (Melopsittacus undulatus) diagnosed with an ingluviolith. The patient presented for intermittent regurgitation, and a palpable foreign body was present in the crop. Radiographs showed a radiopaque foreign body, and computed tomography showed an approximately 16 × 12 mm (length 3 width ...
Perri, Wiggin, Heidi L, Hoefer
openaire   +2 more sources

The differentiation of the acrosome in the spermatid of the budgerigar (Melopsittacus undulatus)

Cell and Tissue Research, 1975
The development of the acrosome of the budgerigar spermatid was studied under the electronmicroscope. The acrosome arises from a granule derived from the Golgi apparatus which interacts with the nucleus to form a cone shaped acrosomal cap and a perforatorium.
openaire   +2 more sources

Behavioral audiometry with the parakeet Melopsittacus undulatus

The Journal of the Acoustical Society of America, 1973
A technique which permits rapid determination of behavioral audiometric thresholds for pure tone in the parakeet (Melopsittacus undulatus) is described. A restrained bird was trained by avoidance conditioning and its threshold determined for 10 frequencies between 0.25 and 8.5 kHz.
openaire   +2 more sources

A survey of causes of mortality in budgerigars (Melopsittacus undulatus)

Veterinary Record, 1980
Lesions found in 257 post mortem examinations of budgerigars (Melopsittacus undulatus) are recorded. The commonest disease was neoplasia, principally of the gonads, kidneys and fat. Hepatitis and focal hepatic necrosis, thyroid dysplasias and septicaemias were also common.
openaire   +2 more sources

Yawning and thermoregulation in budgerigars, Melopsittacus undulatus

Animal Behaviour, 2009
Yawning is a widespread behavioural response expressed in all classes of vertebrates. There is, however, little agreement on its biological significance. One current hypothesis states that yawning serves as a thermoregulatory mechanism that occurs in response to increases in brain and/or body temperature. The brain-cooling hypothesis further stipulates
Andrew C. Gallup, Michael L. Miller, Anne B. Clark   +2 more
openaire   +1 more source

The W-chromosome of the budgerigar, Melopsittacus undulatus

Chromosoma, 1963
The chromosome complement of male and female budgerigars (Melopsittacus undulatus) was studied in primary kidney cell cultures. van Brink's description of the male complement was confirmed. The 26 largest chromosomes can unequivocally be placed in 13 pairs.
Klaus Rothfels, Murray Aspden, Margaret Mollison   +2 more
openaire   +1 more source

The Electronic Digital Computer and Melopsittacus Undulatus

Interfaces, 1984
A unique computer program aids in producing superior specimens of Melopsittacus Undulatus—a parakeet native to Australia. The activity of breeding and exhibiting livestock has a worldwide following, but before this program the mating decision was largely intuitive.
H. Harrison, A. Doyle
openaire   +1 more source

???????????? ?????????????????????????? ?????????????? ???????????????????????????? ?????????????????????? ?????????????????? ???????????????????????? (Melopsittacus undulatus)

2011
Trends were analyzed and the results on the genetic researches of budgerigars have been reviewed. The methods of the genetic analysis of reproductive parameters, adapted to the features of the breeding of this species in captivity, have been described. It was found, that budgerigar can be used as a model for study of the genetic aspects of reproductive
openaire   +1 more source