Effect of removing pups when mating lactating rats at the post-partum oestrus

Abstract

SUMMARYThe removal of rat pups from their dams during mating at the post-partum oestrus improved the rate of copulation and increased the number of pregnancies 2-3 fold. A technique for the mating of lactating rats is described.

Gonadotropin Levels in Lactating Rats: Effect of Ovariectomy12

“…With regard to the post-partum estrus, suckling or at least the presence of pups in some way may affect mating. Kali, Amir and Morag (1971) improved the rate of copulation and increased the number of pregnancies 2-3 fold by removing the pups for 12 hr during the expected post-partum estrus. The basis for this enhanced reproductive performance is unknown.…”

Mating post partum, concurrent lactation and reproduction in the laboratory rat

“…However, the possibility of a reduced level of mating post partum must also be considered. Kali, Amir & Morag (1971) reported that both the incidence of mating and fertility were improved by temporary removal of the litter during the mating period. However, whereas they introduced the male during the afternoon of the day of parturition, in the present study the male was present before parturition as well.…”