Rodent

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.

Effects of oestrogen and progesterone on nest building in the golden hamster

Nest building in golden hamsters was measured by daily removal and weighing of nests built with straw pulled in from a supply outside each cage. Females used increasing amounts of straw as pregnancy advanced. Similar increases were seen in spayed...

Year Published: 1969Animal Type: Hamster, Rodent

Citation: Richards, M. 1969. Effects of oestrogen and progesterone on nest building in the golden hamster. Animal Behaviour 17, 356-361.

Elevation 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.

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.

Brain weight increases resulting from environmental enrichment: a directional dominance in mice

Sets of our male and sets of four female C3HxBALB hybrid mice were raised in (1) small standard cages [280 cm2] that were barren, vs.(2) large test cages [1375 cm2] that were barren, vs.(3) large test cages [1375 cm2] that...

Year Published: 1970Animal Type: Mouse, Rodent

Citation: Henderson, N. D. 1970. Brain weight increases resulting from environmental enrichment: a directional dominance in mice. Science 169(947), 776-778.

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.

Experimental modification of brain weight and behavior in mice: An enrichment study

The effects of environmental enrichment and isolation on cortical weight and learning ability were measured in mice from lines selectively bred for high and low brain weight and from an unselected control line from the same foundation population. Animals from...

Year Published: 1970Animal Type: Mouse, Rodent

Citation: Collins, R. 1970. Experimental modification of brain weight and behavior in mice: An enrichment study. Psychobiology 3, 145-155.

Biological significance, genetics and evolutionary origin of variability in behaviour within and between inbred strains of mice (Mus musculus)

The biological significance, the origin and the genetical causation of differences in behaviour between inbred strains of mice have been studied. Three inbred strains with different origins were used, these were CPBs (Balb), CBA and C57Black. Exploratory behaviour, nestbuilding behaviour...

Year Published: 1971Animal Type: Mouse, Rodent

Citation: Van Oortmerssen, G. A. 1971. Biological significance, genetics and evolutionary origin of variability in behaviour within and between inbred strains of mice (Mus musculus). A behaviour genetic study. Behaviour 38, 1-92.