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The Bruce effect, or pregnancy block, [1] [2] is the tendency for female rodents to terminate their pregnancies following exposure to the scent of an unfamiliar male. [3] The effect was first noted in 1959 by Hilda M. Bruce, [4] and has primarily been studied in laboratory mice (Mus musculus). [1]
It is the most widely used "genetic background" for genetically modified mice for use as models of human disease. They are the most widely used and best-selling mouse strain due to the availability of congenic strains, easy breeding, and robustness. [1] The median lifespan of C57BL/6 mice is 27–29 months and the maximum lifespan is about 36 ...
Male house mice court females by emitting characteristic ultrasonic calls in the 30 kHz–110 kHz [citation needed] range. The calls are most frequent during courtship when the male is sniffing and following the female; however, the calls continue after mating has begun, at which time the calls are coincident with mounting behaviour.
Mice can breed every 30 days. Here are the best mouse traps to get them out fast and keep them out for good.
Mice are the most commonly used vertebrate species, popular because of their availability, size, low cost, ease of handling, and fast reproduction rate. [5] Mice are quick to reach sexual maturity, as well as quick to gestate , where labs can have a new generation every three weeks as well as a relatively short lifespan of two years.
The natural habitat of southern grasshopper mice include hot, arid valleys, and scrub deserts. A male and female along with their offspring occupy a larger home range for burrowing compared to males and females alone. [4] On average, males have a home range of 7.8 acres, while females occupy an area of 5.9 acres. [4]
This effect goes some way to explain why spontaneous pseudopregnancy can occur in mice. The same response is invoked from isolated females when brought into contact with urine-soaked bedding from other females' cages. The adrenal glands are required for production of the urine pheromone which is responsible for this effect. [3]
If the mouse attempts to take the bait, the coin is displaced and the glass traps the mouse. [14] Another method of live trapping, the bucket trap , is to make a half-oval shaped tunnel with a toilet paper roll, put bait on one end of the roll, place the roll on a counter or table with the baited end sticking out over the edge, and put a deep ...