Some transgenic animals may be infertile owing to an inability to mate or to rear a litter. With mice, in vitro fertilization (IVF) can be used to continue the line. the technique involves superovulating females and fertilizing the eggs with sperm taken from the epididymis of males. IVF eggs are then transferred to a 0.5-d pc pseudopregnant recipient female. The strain of mouse used should be the same as those used for the original transgenic mouse production (e.g., C57BL/6J X CBA/JF1). Males should be more than 6 wk of age and preferably studs rested the previous night. Females should be at least 4 wk of age. The described protocol employs a single male and 10 females.
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