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Articles by M. Hamedi
Total Records ( 2 ) for M. Hamedi
  S.J. Hosseini-Vashan , A.R., Jafari-Sayadi , A. Golian , Gh. Motaghinia , M. Namvari and M. Hamedi
  This experiment was conducted to compare the effect of diets with various energy constant ME: CP ratio on performance, nutrients efficiency and carcass characteristics of broiler chickens. In a completely randomized design experiment, five starter, grower and finisher diets were formulated to have 2800, 2,900, 3,000, 3,100 and 3,200 kcal of ME kg-1 whereas the CP in starter diets (0-7 day) were 20.14, 20.84, 21.56, 22.28 and 23%, in grower diets (8-28 days) were 17.5, 18.13, 18.75, 19.38 and 20 and in finisher diets (29-42 days) were 15.75, 16.31, 16.85, 17.43 and 18%, respectively. About 200 day old Arbor acres broiler chickens were randomly assigned to 20 groups of 10 birds each. The ME: CP ratio and other nutrients such as Ca, P and amino acid per CP ratio were fixed over all diets in every period. Feed and water were fed ad libitum. Body weight and feed consumption were measured weekly and carcass characteristics were evaluated at the termination of experiment. Two birds (1 male and 1 female) from each pen were randomly selected and slaughtered to weigh carcass yield, gizzard, heart, liver, abdominal fat, breast meat and thigh meat at the end of experiment. Body weight was greater in birds fed diets contained >3000 kcal kg-1 compared to those fed <3000 kcal ME kg-1. The feed intake was not affected by dietary treatment during growing and finishing periods. Birds fed diets contained lower energy and protein had a higher FCR during all periods. The Energy Efficiency Ratio (EER) and Protein Efficiency Ratio (PER) were decreased in birds fed diets with low CP and ME content during growing period but not affected throughout starter and and finisher periods. Dietary treatments did not influence relative weight of thigh, breast bile, gizzard and abdominal fat but the relative weight of liver and heart increased (p<0.05) when chickens fed diet contained higher ratio of ME: CP. The gender did not affect percentage weight of liver, Gallbladder, gizzard and abdominal fat but the percentage of breast, thigh and heart were influenced by sex of birds. It is concluded that the high nutrients density and high energy diets may improve the nutrients efficiency, carcass characteristics and performance of broiler chickens.
  M. Mohseni , T. Ohe , M.R. Fazeli , S.N. Ostad , M. Hamedi , H. Jamalifar and E. Azizi
  In this study, mutagenic potential of red florets of Iranian Safflowers IL 111 was evaluated by Ames test using Salmonella typhimurium TA98 and TA100 strains. Florets collected and dried in two conditions, dried on shade and dried on the bolls by sun. Extractions have been done with 70% hydro-ethanolic solution and also boiling water. Solvents were then evaporated from extracts by freeze drier. Different dilutions of extracts were prepared in either distilled water or DMSO to be evaluated in the presence and absence of S9 bioactivation. Test and control plates were prepared according to the plate incorporation method and incubated for 48 h at 37°C. Then the number of reverted colonies was counted to determine the Mutation Ratio (MR) for each test concentration. The MR for test samples was far less than positive controls to be considered mutagen. There was also no significant difference in MR of extracts before and after S9 bioactivation at studied concentrations. Therefore, it can be concluded that Safflower extracts have no mutagenic activities under different preparatory and assay conditions using Ames mutagenicity assay.
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