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Articles by A. Mohammadi
Total Records ( 3 ) for A. Mohammadi
  A. Pirzad , H. Alyari , M.R. Shakiba , S. Zehtab-Salmasi and A. Mohammadi
  The essential oil content and chemical composition of German chamomile (Matricaria chamomilla L.) were determined at different irrigation regimes (irrigation at 100, 85, 70 and 55% of field capacity, respectively). Essential oil was obtained by hydro-distillation of dried flower and was analyzed by GC-MS. Results indicated that the yield of dry flower and essential oil per pot, essential oil percent and its composition vary with irrigation regimes. Highest amount of essential oil percent, yield of dry flower and essential oil per pot were obtained from irrigation at 85% of the field capacity. However, it was not significantly different from irrigation at 70% of field capacity. Lowest amount of essential oil percent were obtained when the plants irrigated with 100 and 55% of field capacity. Minimum yield of dry flower and essential oil per pot were observed when the plants irrigated with 55% of field capacity, but it was not significantly different from irrigation at 100% of field capacity. Major constituents of the essential oil for all irrigation treatments were azulene-7-ethyl-1,4-dimethyl, limonene, bisabolol oxides A and B, bisabolone oxide, trans-β-farnesen and isobornyl isobutyrate<8-isobutyryloxy>.
  H. Hamali , S. Mosafery and A. Mohammadi
  Teat end hyperkeratosis is a very important problem which affects cows in the farms of Iran and many other countries. This disease mainly caused by the over milking and defects in the milking machine. In a survey focusing on the 4 large dairy Holstein herds at around of Tabriz (north-west of Iran), prevalence of teat end hyperkeratosis, was evaluated. In the herds of A (n = 300) and B (n = 160), cows were milked 3 times/day. In the herds of C (n = 162) and D (n = 190) cows were milked 2 times/day. Prevalence of the teat end hyperkeratosis in the herds of A and B were recorded as 63.38%. In the herds of B and C this prevalence was 24.86%. Also, according to the Wilson`s grading schedule the grades of 2 and 3 of hyperkeratosis more prevalent between the cows with 3 times milking/day, than cows with 2 times milking/day. Statistical analyses indicated significant differences between the herds of A and B (3 times milking/day) and herds of C and D (2 times milking/day). In conclusion, according to our results, significant relationship exists between the cow`s teat end hyperkeratosis and milking frequency/day.
  M. Amiri Andi , M. Shivazad , S.A. Pourbakhsh , M. Afshar , H. Rokni , N.E. Shiri , A. Mohammadi and Z. Salahi
  Broiler breeders were allocated at random to one of seven experimental diets containing graded levels of supplementary vitamin E (0, 20, 40, 60, 80, 100 and 120 IU kg-1 diet) between 26-35 weeks of age. Egg production, egg weight, fertility, livability and hatchability (30 and 35 weeks of age) were not influenced by the level of vitamin E in the breeder diet. But birds receiving 40 IU of vitamin E kg-1 diet had higher hatchability of fertile eggs compared to 0 and 20 IU of vitamin E kg-1 groups at 35 weeks of age (90.79 vs. 85.09 and 86.60%, respectively). Dietary levels of vitamin E did not affect antibody titer (IgG) against Newcastle disease virus at 35 weeks of age. Antibody titer of day old chicks from hens receiving 60 IU of vitamin E kg-1 were higher (p≤0.05) than chicks from hens fed 0 and 20 IU of vitamin E. At 35 weeks of age (not at 31 weeks of age), Hugh units of eggs were higher (p≤0.05) in hens fed 40, 60, 80, 100 and 120 IU of vitamin E kg-1 compared to 0 IU of vitamin E kg-1 (87.06, 92.21, 93.89, 93.25, 94.61 and 93.09, respectively). Age had negative effect on Hugh units of eggs (p≤0.01). The results of this experiment suggest that the vitamin E requirement of broiler breeders for persisting of hatchability may be 40 IU kg-1 and for maximizing passive transfer of antibody from breeder to progeny may be higher.
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