Rat
Rat brain: Effects of environmental enrichment on wet and dry weights
Wet weight of rat cerebral cortex was increased by exposure to an enriched environment [10 or 12 animals in large cage with toys], as compared with standard colony [2 or 3 animals in small cage] or impoverished conditions [single-housing].
Year Published: 1969Animal Type: Rat, Rodent
Citation: Bennett, E. L., Rosenzweig, M. R., Diamond, M. C. 1969. Rat brain: Effects of environmental enrichment on wet and dry weights. Science 163, 825-826.
Read MoreElevation of adrenal Tyrosine hydroxylase and phenylethanolamine-N-methyl transferase by repeated immobilization of rats
Immobilization result in a neuronally dependent elevation of tyrosine hydroxilase in the adrenal medulla.
Year Published: 1970Animal Type: Rat, Rodent
Citation: Kvetnansky, R., Weise, V. K., Kopin, I. 1970. Elevation of adrenal Tyrosine hydroxylase and phenylethanolamine-N-methyl transferase by repeated immobilization of rats. Endocrinology 87, 744-749.
Read MoreAdrenal 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.
Read MoreStudies 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.
Read MoreRats’ 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.
Read MoreColonic 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.
Read MoreAnimals 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.
Read MoreConditions 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.
Read MoreThe 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.
Read MoreEnvironmental 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.
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