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Articles by A. Towhidi
Total Records ( 4 ) for A. Towhidi
  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
  To prepare standard tables of chemical composition of feedstuffs and to determine digestibility and palatability of different plant species in dromedary camel, this research was carried out by considering the most consuming herbages of Iranian desert rages. The plant species were included Atriplex lentiformis, Alhagi persarum, Seidlitzia rosmarinus, Saueda fruticosa, Haloxylon ammodendron, Tamarix kotschyi, Hammada salicornica, Salsola yazdiana, Salsola tomentosa, Tamarix aphylla and Artemisia sieberi. Thirty samples of the browsing parts were collected from the rangelands of Yazd province in autumn. Chemical composition of samples including Dry Matter (DM), Crude Protein (CP), Crude Fiber (CF), Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), Ether Extract (EE), Total Ash (TA), macro elements (Ca, P, Mg, K), micro elements (Fe, Mg, Cu, Zn)and gross energy (GE) were analyzed. The in vitro digestibility was determined by camel rumen liquor in Tilley and Terry method. Palatability of the plants were measured by three mature camels in cafeteria trials. The camels voluntarily fed 11 plant species during one hour for six days. Data were analyzed by GLM method in SAS software. The highest CP (18.3%) and the lowest NDF (40.4%) and ADF (35.4%) were related to Tamarix aphylla. The lowest CP (5.5%) and the highest NDF (72.8%) and ADF (59.6%) were related to Artemisia sieberi. The highest organic matter digestibility in dry matter was related to Haloxylon ammodendron. The results also indicated that Atriplex lentiformis, Alhagi persarum, Seidlitzia rosmarinus, Saueda fruticosa, Haloxylon ammodendron, Salsola tomentosa, Hammada salicornica, Tamarix kotschyi, Salsola yazdiana, Tamarix aphylla and Artemisia sieberi were more pleasure feed, respectively. It was not observed any correlation between %DOMD and chemical composition. Moreover, There was not a consistent relationship between the palatability of herbages with %DOMD or chemical composition.
  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).
  A. Towhidi , H. Khazali , A. Niasari Naslaji and M. Zhandi
  Two experiments were conducted to investigate the ability of leptin to mediate the effects of energy on the gonadotrophins secretion. In the first experiment, twenty-eight cyclic Chal ewes were assigned randomly to dietary energy restricted (60% of maintenance; n = 14) and control (100% of maintenance; n = 14) groups for 71 days (6 estrous cycles). Estrus was synchronized with seven consecutive injections of PGF2a. Biweekly, Body Weight (BW) and Body Condition Score (BCS) were determined and blood samples were collected to measure plasma leptin concentration. Blood samples were also taken to determine plasma progesterone concentration twice weekly. After each PG injection and from second injection to the end of experiment, four ewes were selected and blood samples were collected at 20 min and hourly intervals for 3 h to detect plasma LH and FSH concentration. In the 2nd experiment, after the ceasing of estrous cycle caused by energy restriction, six acyclic ewes were selected and randomly alloted to two groups (n = 3) and received the following treatment for four days. All ewes in group I were fed with a ration which provided 60% of maintenance energy requirements and intravenously injected with 4 μg leptin kg-1 BW in every day. All ewes in group II were fed with a ration that provided 180% (120+60%) of maintenance energy requirements and intravenously injected with 1 mL saline in every day. In both groups, blood samples were collected at 20 min and hourly intervals for 3 h before feeding on day 0 and day 5 and for 3 h before and after injections as above on day 2 and day 4 to detect plasma LH and FSH concentration. In the first experiment, BW and BCS from the second estrous cycle and leptin from the third estrous cycle to end of experiment significantly (p<0.05) decreased. In the dietary energy restricted ewes, mean plasma concentrations of FSH significantly (p<0.01) decreased from fourth estrous cycle to day 71 and LH pulsatile secretion suppressed on day 71, so that, mean plasma concentrations of LH (p<0.05) and LH pulse frequency (p<0.01) and LH pulse amplitude (p<0.05) significantly decreased. In the second experiment, injection of leptin significantly increased mean circulating concentrations of LH (p<0.05), LH pulse frequency (p<0.01) and LH pulse amplitude (p<0.05) and mean circulating concentrations of FSH (p<0.01) and leptin (p<0.01). High energy intake significantly (p<0.05) stimulated pulsatile secretion of LH and leptin secretion (p<0.01), but increased non-significantly plasma FSH concentration. The results of this study imply that the effects of energy on the gonadotrophins secretion are mediated by leptin in ewe.
 
 
 
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