title: Progesterone level does not distinguish the different course of canine ovulation determined by ultrasonography.
abstract: The aim of this study was to compare progesterone concentrations in bitches during ovulation with a different course of follicular collapse as determined by ultrasonography. The study was conducted on 36 animals of different breeds, from 2 to 7 years old, and from 2 to 44 kg of body weight. Ultrasound examinations of ovaries were conducted in the peri-ovulatory period until ovulation was detected. Based on USG scans the animals were divided into two groups: group A with fast follicular collapse within 1 day, and group B with gradual follicular collapse within 2-3 days. Progesterone measurements were performed in both groups on the day when the beginning of ovulation was diagnosed by USG. Follicular collapse in group A was observed in 27.8% of animals (n = 10) and in group B in 72.2% (n = 26). There were no statistical differences (p < 0.05) in progesterone concentrations between groups A and B (6.68 +/- 0.92 ng/ml and 6.81 +/- 0.57 ng/ml respectively). From 31 bred bitches (natural mating or insemination) pregnancy was confirmed in 29 females (93.5%). These results provide information about the sufficient stability of progesterone concentration during ovulation regardless of the follicular collapse speed. Ultrasonography during the peri-ovulatory period combined with progesterone measurements allows progress in ovulation management.
authors.forename: A
authors.initials: A
authors.lastname: Domosławska
authors.forename: A
authors.initials: A
authors.lastname: Jurczak
authors.forename: T
authors.initials: T
authors.lastname: Janowski
mesh_terms: D000818:Animals; D004285:Dogs / Q000097:blood* / Q000502:physiology*; D005260:Female; D005298:Fertility / Q000502:physiology; D010053:Ovary / Q000000981:diagnostic imaging*; D010060:Ovulation / Q000097:blood* / Q000502:physiology*; D011247:Pregnancy; D011374:Progesterone / Q000097:blood* / Q000502:physiology; D014463:Ultrasonography
chemical_list: D011374:Progesterone