Therefore, the objective was to develop a low-cost rat model of nonunion fracture with a vascular deficit that enabled standardized quantitative analysis of bone growth and regeneration.
The increased predictive power comes at a cost: fewer rats are classified as susceptible (∼18%).
However, this adaptation has a functional cost: The rats showed cognitive deficits, even when the cholinesterase level had returned to normal.
Rats cost $3,500 to $7,500 -- depending on size -- and, for Local 79, are made by Big Sky Balloons and Searchlights Inc. of Plainfield, Ill.
Norfolk, like the rest of the railroad industry, spent a half-century in a siege mentality, slouching along by shrinking and slashing costs, tangled in rat's-nest mergers and wrestling with its featherbedding unions.
Finally, the preference for saccharin was maintained in the face of increasing reward price or cost, suggesting that rats did not only prefer saccharin over cocaine ('liking') but they were also more willing to work for it than for cocaine ('wanting'wanting
Although the cost of housing rats is roughly twice as expensive as mice, the ability to use fewer animals reduces the overall cost in the long run.
Indeed, object-in-place memory tasks have been used to explore sex differences on cognitive function in rats (Cost et al. 2012) and cognitive function in animal models of schizophrenia (Howland et al. 2012) drug addiction (Reichel et al. 2012) and mild cognitive impairment (Douma et al. 2011).
A rat, which costs $6,500 to train, can rattle through 100 samples in 20 minutes.
Having risked my career in order to escape, at all costs, the Great American Rat Race, this was disconcerting to me.
A pet rat alone costs anywhere between £5 and £7, as-is.
