title: The relationship between plasma leptin and FSH concentrations with ovulation rate in Iranian native sheep.
abstract: The aim of this study was to determine the relationship between plasma leptin and FSH concentration in Iranian sheep. Forty female Mehraban and Sanjabi sheep were used. All ewes were cyclic and synchronized with cloprestenol. The ewes were divided into two breed groups: Mehraban breed (n = 20) and Sanjabi breed (n = 20), feeding at maintenance level. On the first and second days of estrus cycle, blood samples were collected from the jugular vein. Ovulation number was determined by endoscopy 7 days after the second injection. Mean Plasma leptin concentrations on second day (4.74 +/- 0.15 and 4.68 +/- 0.10 ng mL(-1)) were significantly higher than those on first day (2.64 +/- 0.11 and 2.56 +/- 0.04 ng mL(-1)) for Mehraban and Sanjabi sheep, respectively (p<0.01). Mean plasma FSH concentrations on second day (2.75 +/- 0.17 and 2.74 +/- 0.15 ng mL(-1)) were also significantly greater than those on first day (1.19 +/- 0.05 and 1.19 +/- 0.04 ng mL(-1)) for Mehraban and Sanjabi ewes, respectively (p<0.01). In the present study, positive relationship has been shown between plasma Leptin and FSH concentrations (p<0.01) in Mehraban and Sanjabi sheep. Ovulation rate had a significant difference between Mehraban (1.20 +/- 0.33) and Sanjabi (1.07 +/- 0.1) ewes. Significant differences were not observed between concentrations of FSH and leptin with ovulation rate in both breeds (p < or = 0.01).
authors.affiliation: Department of Animal Science, Faculty of Agronomy and Animal Science, University of Tehran, P.O. Box 31587-4111 Karaj, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Towhidi
authors.forename: R
authors.initials: R
authors.lastname: Masoumi
authors.forename: M M
authors.initials: MM
authors.lastname: Moeini
authors.forename: H
authors.initials: H
authors.lastname: Solgi
authors.forename: H
authors.initials: H
authors.lastname: Moravej
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D004724:Endoscopy / Q000662:veterinary; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood*; D007492:Iran; D020738:Leptin / Q000097:blood*; D010060:Ovulation / Q000502:physiology*; D012756:Sheep / Q000502:physiology*; D013045:Species Specificity
chemical_list: D020738:Leptin; D005640:Follicle Stimulating Hormone