For a standard insemination, there is no need to take the pipette more than one-half (½) an inch into the uterus. Gravity will immediately kick in and cause the semen to drop to the lowest point when inseminated. Increasing the distance - if care is not taken - may cause irritation to the uterine lining.
Note that a different set of rules apply to "deep horn insemination" which is potentially beneficial with sub-optimal insemination doses. In this technique, the pipette is taken up to the tip of the uterine horn ipsilateral to the ovulating follicle.
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