reproductive and maternal performance of a line of mice selected for large first parity litter size ( l+ ) and a control line ( k ) were compared under two mating systems : ( 1 ) postpartum mating ( pp ) , in which females undergo concurrent gestation and lactation , and ( 2 ) postweaning mating ( pw ) , in which females wean their litter before being remated .
C0035150
reproductive
C0032961
gestation