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Articles by H. Fazaeli
Total Records ( 5 ) for H. Fazaeli
  H. Behbahani , S. Nowbakht , H. Fazaeli and J. Rahmani
  The purpose of this study is to evaluate the effect of fiber type and content on the rutting performance of stone matrix asphalt mixtures. In this research two types, cellulose fibers (made in Iran and Germany) and mineral fibers (rock wool) with various percentages (0.1-0.5%) of the total weight of the Stone Matrix Asphalt (SMA) mixture were used and after determining optimal bitumen content for each fiber percentage, we examined their effect on SMA bulk specific gravity, Void in Mineral Aggregate (VMA), void content, Marshall stability, Indirect Tensile Strength (ITS) and flow parameters. Also results of dynamic creep test were used as an indicator of rutting performance of SMA specimens. Results of the laboratory tests showed that variation of fiber type and content can lead to considerable changes in rutting performance of SMA. Specimens made with 3% cellulose-GER (made in Germany) has resulted to highest value of ITS and least permanent deformations. Also with considerations of potential rutting, optimum percentage for each fiber type has been concluded.
  H.R. Shahbazi , A.A. Sadeghi , H. Fazaeli , G. Raisali , M. Chamani and P. Shawrang
  The effect of electron beam irradiation at doses of 100, 200 and 300 kGy on ruminal dry matter degradation kinetics of wheat straw was investigated. Samples were irradiated by electron beam irradiator under identical conditions of temperature and humidity. Nylon bags of untreated or irradiated wheat straw were suspended in the rumen of three Taleshi steers for up to 96 h and resulting data were fitted to non-linear degradation model to calculate degradation parameters of dry matter. Results show that the washout fractions of dry matter increased linearly (p<0.001), but potentially degradable fraction and degradation rate decreased linearly (p<0.001) by electron beam irradiation. As a consequence, the effective degradability of dry matter increased linearly (p<0.001) with increasing irradiation dose. Electron beam irradiation at doses of 100, 200 and 300 kGy increased the effective degradability of dry matter at rumen outflow rate of 0.05/h by about 7, 15 and 18%, respectively. In the condition of this study, electron beam irradiation at dose of 200 kGy appeared to be a suitable dose for improving dry matter degradability of wheat straw in the rumen.
  H. Mahmoudzadeh , H. Fazaeli , I. Kordnejad and H.R. Mirzaei
  A factorial experiment with completely randomised design was conducted, using 27 heads of 15 month buffalo male calves with initial live weight of 287±15 kg. The animals were individually housed and randomly allocated into 9 treatment groups of three animals each. Three levels of energy (E1, E2, E3) with three levels of crude protein (P1, P2, P3) were formulated to provide 90, 100 and 110% requirement equivalents for 900 g, expected body weight gain of steers derived from NRC beef cattle requirements (1976). Live weight changes were obtained by direct weighing of the animals every month and ended by slaughtering the calves for carcass index measurements. Results indicated that Dry Matter Intake (DMI) was not significantly different between treatments. Average Daily Gain (ADG) ranged from 503 to 951 g/animal that was significantly varied among the diets (p<0.05). The significantly higher daily gain was obtained (p<0.05) when animals received medium energy diets that was similar to 100% beef cattle steer requirements. In addition the feed conversion ratio was significantly lower, when the animals received medium energy diets (p<0.05). The dressing yield as well as the meat %age was not affected by the type of the diet, but abdominal fat was significantly higher in medium energy diets (p<0.05). It can be concluded that the optimum fattening performance of 15 month old buffalo male calves may be obtained by providing around 10.42 MJ/kg of dietary metabolisable energy and about 10.22% of crude protein.
  H. Fazaeli , A. Azizi and M. Amile
  Wheat straw was inoculated by two species of Pleurotus fungi (H-77 and H-82) in polyethylene bags. After 17 days, half of the bags were removed from fermentation room and sampled. Fermentation were sized in an other half of the bags after two flashes of mushroom harvested in seven weeks. Chemical analysis and in vivo digestibility were conducted on straw before and after fermentation. In a feeding trial, in vivo digestibility and voluntary intake determined by sheep, where the dietary treatments were T1) untreated wheat straw, T2) fungal treated wheat straw (F-77) after complete mycelium run before fruit formation, T3) fungal treated wheat straw (F-77) after harvesting of mushroom, T4) fungal treated wheat straw (H-82) before formation of mushroom and T5) fungal treated wheat straw (H-82) after harvesting of mushroom. Fungal treatment significantly (p<0.05) increased the crude protein but decreased the cell wall components of straw. The digestibility and TDN were significantly (p<0.05) higher in T2 and T3. Average daily intake of DM and OM were significantly (p<0.05) higher in T2 but lower in T5 comparing to the initial straw (T1). In comparison to the untreated straw, fungal treatment increased the digestibility of straw as well as the voluntary intake, at the stage of mycelia running. However, the digestibility and intake of mushroom harvested straw were significantly (p<0.05) decreased. In conclusion, treated straw by two species of fungi, improved the nutritive value index, but the nutritive value of mushroom harvested straw was lower than that of the initial straw.
  H. Fazaeli , H.A. Golmohhammadi , A. Al-Moddarres , S. Mosharraf and A.A. Shoaei
  Sweet sorghum and maize were cultivated, in research station where the agronomic parameters recorded and the forage harvested and ensiled when the seeds were at dough stage. At the second step, 32 yearling male calves with 229±1.2 kg initial weight, were used to assess their fattening performances with two types of silages (sorghum and maize), using a completely randomized design with four diets where maize silage was substituted with sorghum silage in the amount of 0, 33, 66 and 100% of diets I, II, III and VI, respectively. The sorghum seed required ha-1 was much lower (4 vs. 30 kg ha-1) than that of the maize as well as the number of irrigations (8 vs. 11). However, the amount of forage yield per hectare was relatively similar for both crops. During the 120 days of feeding trial, average daily gain were 1037, 1068, 1010 and 1157 g for the diets I, II, III and VI, respectively which were not significantly different (p<0.05). The average dry mater intake was 7.50, 7.56, 7.74 and 8.06 kg, feed conversion ratio 7.23, 7.07, 7.66 and 6.59, respectively that were not significantly different (p<0.05). It conclusion, feeding performance of the sorghum silage was similar to the maize silage with the advantages of agronomy parameters.
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