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Articles by A. Karimi
Total Records ( 3 ) for A. Karimi
  H. Farahbakhsh , N. Pakgohar and A. Karimi
  Present experiment was carried out to investigate the influence of nitrogen (150 and 300 kg ha-1) and sulphur (0, 100 and 200 kg ha-1) fertilizers on yield, yield components and oil content of two cultivars of oilseed rape (Brassica napus L.), Hyola 308 and PF7045. The experiment was factorial, laid out in Randomized Block Design with three replicates. Biological and economical yield were significantly different between cultivars. The higher grain weight of Hyola 308 was due to bigger size of pods and heavier seed weight. Application of nitrogen did affect biological yield positively but it did not affect grain weight. The increase in dry matter production or biological yield was 14% when the amount of nitrogen fertilizer increased from 150 to 300 kg ha-1. Sulphur application affected neither dry matter production nor grain weight. Two cultivars were significantly different for oil contents. Nitrogen affected the oil content negatively and decreased it by 3.3%. Increasing the amount of sulphur fertilizer from zero to 200 kg ha-1 resulted in an increase in oil content.
  A. Karimi , H. Karami , M.M. Moini , A.A. Ahmadi Sefat and E. Haghvirdilu
  In order to determine different protocols of synchronization and their efficiency on pregnancy rate after fixed-timed AI (TAI), 120 dairy Holstein cows (n = 120) were assigned randomly to six groups: 1) two injections of Prostaglandin F (PGf2α) with 12 days apart as a control group, 2) two injections of Gonadotropin Releasing hormone (GnRH) with 9 days apart and an injection of PGf2α at day 7, 3) injection of GnRH and PGf2α with 7 days apart, then single injection of Estradiol Benzoate (EB) after 48 h, 4) injection of progesterone (P4) in conjugation with EB then after 7 days PGf2α injection and after 48 h an injection of GnRH were done, 5) as group 4 but EB was used instead of GnRH, 6)injections of PGf2α and EB conjugated with Human Chronic Gonadotrophin (hCG) with 12 h apart. Animals in group 1 (control), groups 2-5 and group 6 were inseminated after 72, 20 and 36 h, respectively. Serum P4 concentration of group 4 (4.43± 1.50 ng mL-1) was higher than control group (2.34±1.36 ng mL-1) at day 5 after insemination (p<0.05); P4 concentrations of groups 3 and 4 have significant differences with control group (2.69±2.64 and 2.56±1.40 versus 0.81±0.41 ng mL-1, respectively, p<0.05) at a day after second injection and groups 4 and 5 were in higher level of P4 concentration than control group at insemination time (3.14±1.9 and 2.89±1.8 versus 0.45±0.19 ng mL-1 respectively, p<0.05). Pregnancy rate were 0, 50, 45, 10, 30 and 45% for group 1 (control) through 6, respectively.
  A. Karimi , H. Karami Shabankareh and M.M. Moeini
  This study was carried out to evaluate the effects of different levels of GnRH in different days of reproductive cycle on progesterone concentration in dairy heifers. Two hundred heifers were divided into ten experimental treatment: control group with no injection 1) administration of 2.5 mL Gonadorelin (a GnRH analogue) in day of insemination 2) administration of 5 mL GnRH in day of insemination 3) administration of 10 mL GnRH in day of AI insemination 4) administration of 2.5 mL GnRH in day 5 post-insemination 5) administration of 5 mL GnRH in day5 post-insemination 6) administration of 10 mL GnRH in day5 post-insemination 7) administration of 2.5 mL GnRH in day 12 post-insemination 8) administration of 5 mL GnRH in day 12 post-insemination 9) administration of 10 mL GnRH in day 12 post-insemination. Blood samples were collected in days 0, 5, 12 and 19 post insemination (AI = Day 0) for analysis of serum P4 concentration. There was no significant difference among experimental groups on day of insemination. Evaluation of P4 concentration on day 19 illustrated differences in progesterone concentration between groups on day 19 post-insemination. P4 concentration of serum in the day 19 post-insemination significantly increased in groups either by 5 or 10 mL injection of GnRH whether in day 5 or 12 post-insemination versus control group (9.24±2.2, 8.6±1.96, 9.43±2.15 and 9.42±2.14 versus 5.5±0.8, respectively; p<0.05). GnRH administration in the day 5 and 12 post-AI significantly increased progesterone concentration that may decline early embryonic death and improve pregnancy rate.
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