A reduction in the availability of oxidizable metabolic fuels inhibits reproduction. When ovariectomized, steroid-primed hamsters are food deprived for 48 hours, estrous behavior is suppressed. However, the specific neuroendocrine alterations that mediate the suppression or rest…
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This study developed a robust technique for the assessment of morphometric differences among overwintering northern fish populations. Arctic charr were sampled soon before the freeze-up and just after ice break-up at two subarctic Quebec lakes. A homogenous sample of 397 fish wa…
The crystal structure of the complex of porcine pancreatic elastase with a chymotrypsin/elastase inhibitor from Ascaris suum has been solved to 2.4 A by the molecular replacement method. The C/E-1 inhibitor displays a novel folding motif, confirming that serine proteinase inhibi…
Enkephalin plays a role in male cat, mouse, and rat, social behavior. No such correlation has been reported in the male hamster. However, several brain nuclei involved in male hamster social behaviors have been identified. We therefore asked: Are enkephalin immunoreactive (Enk-i…
Sixteen Arabian yearlings were randomly assigned to two experimental groups, stalled and pastured, to investigate the effects of stalling versus pasture-rearing on bone growth over a 140-day period. Following an 84-d pre-training period, six horses from each group were randomly …
Le but de cette étude était d'examiner, chez un groupe choisi d'oiseaux aquatiques, si la quête alimentaire diurne ou nocturne et le recours à des stratégies de chasse visuelle ou tactile sont corrélés avec la structure et la fonction de leur rétine. Les espèces retenues pour l'…
Endothelin-1 (ET-1) is produced by endothelial cells and can stimulate either the ETA or the ETB receptors. The role of ET-1 and the identity of the endothelin receptors involved in mediating tone in the mesenteric small veins of the Golden Syrian hamster are not known. ET-1 ind…
Increased prolactin (PRL) secretion by the anterior pituitary gland is responsible for expression of incubation behavior that results in ovarian regression and loss of egg production in turkey breeder hens. A cellular basis for the heightened PRL secretion in the turkey hen has …
The present research was performed to characterize immunoreactive (ir) pituitary cells in the equine species. Two experiments were performed to measure the prevalence of single- and double-hormone labeled gonadotropes, lactotropes, somatotropes, and mammosomatotropes. In Experim…
The effect of dietary ethanol on atherosclerotic regression and vasoconstriction in atherosclerotic rabbits was addressed by feeding male New Zealand white rabbits (n = 19) a diet enriched with 0.8% cholesterol for 45 days, followed by randomization to one of three diets for the…
There is a dearth of empirical evidence demonstrating the degree to which exercise increases dietary protein requirement of the horse relative to maintenance. Knowledge of protein digestibility in diets fed to exercising horses is also essential to meet the protein need of the a…
The Syrian golden hamster (Mesocricetus auratus) is a well-established experimental model for gustatory studies. Investigations of the processing of taste information at the cerebral cortical level, however, lag behind those at peripheral and brainstem levels. In part, this may …
The visceral anatomy of 270 species of blindsnakes and wormsnakes is described and 99 characters are tabulated. Sexual dimorphism and intraspecific variation is examined in three species. A phylogenetic analysis of 299 characters (50% osteological, 10% visceral, and 40% miscella…
Although elevation in plasma glucocorticoids (GCs) is necessary during times of stress, such as during exercise, to help in mobilization of substrates for energy utilization, chronic exposure to excess GCs has also been linked to the development of obesity, insulin resistance an…
Nitric oxide (NO) is a potent endogenous vasodilator that is involved in the regulation of vascular tone and organ perfusion both in health and disease. NO is the final product of the oxidation of terminal guanidino nitrogen of the amino acid L-arginine by the enzyme nitric oxid…
Segregation of actin binding proteins could partially be explained if the presence of one cytoskeletal actin binding protein on the actin lattice increased the affinity for other cytoskeletal actin binding proteins. The first half of this dissertation tested this hypothesis. The…
Regulatory mechanisms responsible for the variable effects of dietary fatty acids on cholesterol metabolism were investigated. Male Syrian hamsters (F1B hybrid) were fed a modified version of the NIH-07 open formula, cereal-based rodent diet enriched in one of five dietary fatty…
High performance liquid chromatography (HPLC) was used to identify steroids (unconjugated (free) and conjugated) in the plasma and eggs of five-year-old adult female Arctic charr (Salvelinus alpinus). High levels of androgens, 11-oxygenated androgens, estrogens, progestogens and…
In comparison to the adult birds, young chickens and turkeys have a reduced ability to use dietary fat. It was of interest to investigate the role of lipase in fat malabsorption in young birds. It was hypothesized that fat malabsorption in young chickens and turkeys is due to an…