title: Reproductive seasonality in creole hair sheep in the tropic.
abstract: The objective of the present study was to evaluate the annual ovulatory activity of hair sheep at 15° N. Nineteen Creole ewes with body weight of 40.8 ± 0.3 kg were used. The ovulatory activity was monitored for a year by quantifying progesterone concentrations in blood samples obtained from all the ewes every 7 days. The differences in monthly proportions of ewes with ovulatory activity were analyzed by the chi-square test. Ovulatory activity decreased from May to July and in September, and 42% of ewes ovulated year round. It is concluded that at 15° N, a high proportion of ewes is capable of ovulating throughout the year in the tropical southeastern region of Mexico.
authors.forename: Jaime
authors.initials: J
authors.lastname: Arroyo
authors.forename: Norma Judith
authors.initials: NJ
authors.lastname: Sánchez-Hernández
authors.forename: Narciso Ysac
authors.initials: NY
authors.lastname: Ávila-Serrano
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Camacho-Escobar
authors.forename: Mabel
authors.initials: M
authors.lastname: Rodríguez-De-La-Torre
mesh_terms: D000818:Animals; D005260:Female; D008800:Mexico; D010060:Ovulation / Q000235:genetics / Q000502:physiology; D012098:Reproduction / Q000235:genetics / Q000502:physiology*; D012621:Seasons; D034561:Sheep, Domestic / Q000235:genetics / Q000502:physiology*; D014329:Tropical Climate