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Articles by R. Masoumi
Total Records ( 2 ) for R. Masoumi
  R. Masoumi , A. Towhidi , A. Nejati Javaremi , H. Nabizadeh and M. Zhandi
  The objective of this study was to determine whether injections of Cloprostenol (PGF2 αanalog) in low libido Holstein bulls can improve seminal characteristics and libido. Ten low libido Iranian Holstein bulls were randomly assigned to two groups and received; (1) 250 μg of Cloprostenol (n = 5) or (2) 2 mL of saline (n = 5) 30 min prior to collection of semen 2 days per week for 2 months. Reaction time was significantly decreased in treatment group. Duration of ejaculation was significantly increased in treatment group. Semen volume and sperm concentration were greater in treated bulls in compare with controls. The percentage of morphologically normal sperm cells, percentage of live sperm cells, motile sperm cells and post-thaw motile sperm cells were not affected by treatment. Plasma testosterone concentrations were increased approximately two fold after Cloprostenol injection. Overall, injection of Cloprostenol at this dosage and frequency increased libido, semen volume, sperm concentration and plasma testosterone concentration in low libido Holstein bulls.
  A. Towhidi , R. Masoumi , M.M. Moeini , H. Solgi and H. Moravej
  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±015 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≤0.01).
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