title: Incidence of spontaneous ovulation in young, group-housed cats based on serum and faecal concentrations of progesterone.
abstract: Cats are considered to be reflex ovulators that exhibit a luteal phase (pregnancy or pseudopregnancy) only after copulatory stimulation. In a group-housed colony of 15 1-year-old domestic queens, 23 noncopulatory, spontaneous ovulations were observed in 87% of the queens over 4.5 months based upon the detection of increased concentrations of progesterone in faeces, serum, or both. Luteal phases were detectable for periods of 3 to 5 weeks with peak progesterone concentrations averaging 21 +/- 1 ng ml-1 in serum and 1874 +/- 281 ng g-1 in faeces. Individual cats exhibited from 0 to 3 spontaneous ovulations and subsequent pseudopregnancies each. A male was added to a separate cage within the room during the last 1.5 months of the study. The incidence of ovulation per 10 day period ranged from 0% to 22% before introduction of the male and from 33% to 57% immediately after introduction of the male, suggesting a potential noncopulatory influence of the male on the incidence of spontaneous ovulation in young, group-housed cats.
authors.affiliation: Department of Psychology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
authors.forename: D F
authors.initials: DF
authors.lastname: Gudermuth
authors.forename: L
authors.initials: L
authors.lastname: Newton
authors.forename: P
authors.initials: P
authors.lastname: Daels
authors.forename: P
authors.initials: P
authors.lastname: Concannon
mesh_terms: D000818:Animals; D002415:Cats / Q000502:physiology*; D005243:Feces / Q000737:chemistry*; D005260:Female; D008297:Male; D010060:Ovulation / Q000097:blood / Q000502:physiology*; D010061:Ovulation Detection / Q000379:methods / Q000662:veterinary*; D011374:Progesterone / Q000032:analysis* / Q000097:blood; D012931:Social Environment
chemical_list: D011374:Progesterone