Rat

Adrenal and urinary catecholamines in rats during adaption to repeated immobilization stress

Rats subjected to daily immobilization for up to one year still excreted greater amounts of epinephrine than did control animals or animals after their first immobilization. These increases levels of urinary ephinephrine were not accompanied by a decrease in adrenal...

Year Published: 1970Animal Type: Rat, Rodent

Citation: Kvetnansky, R., Mikulaj, L. 1970. Adrenal and urinary catecholamines in rats during adaption to repeated immobilization stress. Endocrinology 87, 738-743.

Studies of brain weight and RNA content after short periods of exposure to environmental complexity

Rats in Environmental Complexity (EC) were compared with litter mates maintained in Impoverished Conditions (IC) for various times. An initial relatively fast onset of the difference between the cerebral weight of the EC and IC rats was observed. This phase...

Year Published: 1970Animal Type: Rat, Rodent

Citation: Ferchmin, P. E., Eterovic, V. A., Caputto, R. 1970. Studies of brain weight and RNA content after short periods of exposure to environmental complexity. Brain Research 20, 49-57.

Rats’ preference for earned in comparison with free food

When work demands are not too high, rats prefer earned food to free food.

Year Published: 1970Animal Type: Rat, Rodent

Citation: Carder, B., Berkowitz, K. 1970. Rats' preference for earned in comparison with free food. Science 167, 1273-1274.

Colonic temperature of rats during handling

When rats are gently handled, their core temperature rises as a stress response.

Year Published: 1970Animal Type: Rat, Rodent

Citation: Briese, E., deQuijada, M. G. 1970. Colonic temperature of rats during handling. Acta Physiologica Latinoamerica 20, 97-102.

Animals respond for food in the presence of free food

Pigeons pecked a response disk to gain access to grain rewards while identical grain was freely available ... Similarly, rats pressed a lever for food pellets while free pellets were present. ... The act of producing food can serve as...

Year Published: 1969Animal Type: All/General, Bird, Other Bird, Rat, Rodent

Citation: Neuringer, A. J. 1969. Animals respond for food in the presence of free food. Science 166, 399-401.

Conditions producing psychogenic polydipsia in animals

Psychogenic polydipsia is reported in rats.

Year Published: 1969Animal Type: Rat, Rodent

Citation: Falk, J. L. 1969. Conditions producing psychogenic polydipsia in animals. Annals of the New York Academy of Sciences 157, 569-593.

The effect of light intensity on the breeding and development of rats and golden hamsters

It was noticed that animals subjected to an illumination of 2000 lux were tame and playful with handling, while those at lower light intensities resisted handling and tried to bite when vaginal smear was taken. ... The weight of some...

Year Published: 1969Animal Type: Hamster, Rat, Rodent

Citation: Weihe, W. H., Schidlow, J., Strittmatter, J. 1969. The effect of light intensity on the breeding and development of rats and golden hamsters. International Journal of Biometeorology 13, 69-79.

Environmental influence on brain and behavior of year-old rats

The beneficial effects of environmental enrichment are not restricted to a brief cricial period in development. Positive effects occur also in rats aged 300 days when first placed in an enriched environment.

Year Published: 1971Animal Type: Rat, Rodent

Citation: Riege, W. H. 1971. Environmental influence on brain and behavior of year-old rats. Developmental Psychobiology 4, 157-167.

Reinforcing properties of spontaneous activity in the rat

Required 21 male sprague-dawley rats to bar press on an ascending sequence of fixed-ratio requirements in order to run in either a voluntary treadmill or a braked running wheel. In both testing situations the duration of the burst of running...

Year Published: 1971Animal Type: Rat, Rodent

Citation: Collier, G. H., Hirsch, E. 1971. Reinforcing properties of spontaneous activity in the rat. Journal of Comparative and Physiological Psychology 77, 155-160.

Physiological responses to blood collection methods in rats

Plasma glucose levels are related to the length of handling time during blood collection.

Year Published: 1971Animal Type: Rat, Rodent

Citation: Besch, E. L., Chou, B. J. 1971. Physiological responses to blood collection methods in rats. Proceedings of the Society for Experimental Biology and Medicine 138, 1019-1021.