Andersson C B, Gustafsson T O
J Reprod Fertil. 1979 Nov;57(2):349-52. doi: 10.1530/jrf.0.0570349.
The time of blastocyst implantation in lactating and non-lactating female bank voles was studied. In primiparous females implantation started 4 days and 9-11 h after mating. A delayed implantation of at least 1 1/2 days was found in lactating, multiparous females when compared to non-lactating, multiparous and primiparous females.