title: The effect of pregnancy on the interval between one oestrus and the next in the tammar wallaby, Macropus eugenii.
abstract: In females mated to vasectomized males the interval between oestrous periods was 30.6 +/- 1.17 (s.d.) days but when mated to intact males and pregnancy intervened, it was 29. +/- 1.26 days (P less than 0.0025). After removal of pouch young, females carrying diapausing blastocysts gave birth 26.2 days later and came into oestrus 26.4 +/- 0.57 (s.d.) days later. When post-partum fertilization was prevented, removal of pouch young was followed by oestrus 30.4 +/- 0.99 days later (P less than 0.0005). These results indicate an influence of the conceptus upon the oestrous cycle of Macropus eugenii.
mesh_terms: D000818:Animals; D004971:Estrus; D005260:Female; D007614:Macropodidae / Q000502:physiology*; D008297:Male; D008394:Marsupialia / Q000502:physiology*; D011247:Pregnancy; D011270:Pregnancy, Animal; D013997:Time Factors