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Articles by A.R. Seidavi
Total Records ( 8 ) for A.R. Seidavi
  H. Kioumarsi , K. Jafari Khorshidi , M. Zahedifar , A.R. Seidavi , S.Z. Mirhosseini and M.R. Taherzadeh
  In this study, two levels of Metabolizable Energy (ME) (2.3 and 2.5 Mcal kg-1 DM) and three levels of Crude Protein (CP) (12, 14 and 16%) and their interactions were studied to identify the optimum levels of dietary energy and protein for lambs of the Taleshi breed. The growth performance variables measured included Average Daily Gain (ADG), final weight, Daily Dry Matter Intake (DDMI, kg day-1) and Feed Conversion Ratio (FCR) whilst other commercially important factors were assessed during specific periods. The urea dilution method was used for predicting the body composition of live lambs. At the end of the experiment, all animals were slaughtered, the carcasses were cut and the chemical composition of the area around the 9th, 10th and 11th rib was measured. The study comprised a completely randomized design with a 2x3 factorial arrangement with four replications per diet. The results showed that the energy and protein levels had a significant effect (p<0.05) on growth. The diet with 2.5 Mcal ME kg-1 and 14% CP was associated with the best final weight, ADG, FCR, feed cost kg-1 gain, un-variable profit kg-1 live weight, un-variable profit/total gain, carcass weight, shoulder weight, thigh weight and ribeye area (REA). A high dietary energy level helps to produce more ME and fermentable products for paunch microorganisms resulting in an increase in the synthesis of microbial protein and therefore the amount of protein available to the animal. Increasing the dietary protein level causes a change in the process of fermentation in the paunch whilst increasing fatty acid production and the ratio of propionate to fatty acids. These changes in the paunch improve the lamb`s energy balance allowing more nitrogen to be stored and increasing the body weight.
  H. Kioumarsi , K. Jafari Khorshidi , M. Zahedifar , A.R. Seidavi , Z.S. Yahaya , W.A. Rahman and S.Z. Mirhosseini
  This study estimated the relationship between Urea Space (US) and carcass attributes in lambs to derive coefficients for these relationships and functional equations for components of carcass quality and quantity. Twenty-four male Taleshi lambs with an average age of 8 months were used. Lamb live weight was determined using the urea dilution method and two or three days before slaughter, the urea dilution procedure was again used to estimate the chemical composition of the carcass. Subsequently, plasma urea nitrogen was determined and the percentage of urea space to lamb live weight was calculated. After slaughter, the carcasses were butchered and the parts measured. The results showed that the average amount of urea injected was 20.09 cm2 and the Blood Urea Nitrogen (BUN) averaged 17.16 and 27.72 mg before and after injection respectively. The average percentage of US to lamb live weight was 18.78%. Correlation coefficients between live weight, empty body weight, hot carcass weight and the weight of different parts of the carcass were high and statistically significant (p < 0.01). The urea space was significantly related to the percentage of protein and ash in the region of the 9th, 10th and 11th ribs (p < 0.05). Using this rib area and US, the development of functional equations between live weight and empty body weight for different parts of the carcass showed that the urea dilution test is a useful tool for predicting the chemical composition of Taleshi lamb carcasses.
  A.R. Seidavi , S.Z. Mirhosseini , M. Shivazad , M. Chamani and A.A. Sadeghi
  In the present study, a multiplex Polymerase Chain Reaction (mPCR)-based assay was developed for the simultaneous identification of Salmonella sp., Escherichia coli and Bifidobacterium sp., that isolated from broiler gastrointestinal in Iran. In order to detect these bacteria species, we were used a set of specific primers that produce different fragment size. Our results showed that all tested gastrointestinal segments were contaminated by these species and therefore the mPCR method is a appropriate method to identify these species directly from poultry gastrointestinal samples. There was no difference in the sensitivity of this method between samples of different gastrointestinal segments. This method has the potential to save considerable time and effort within the laboratory. Our developed mPCR is fast, sensitive, specific and can be used as a reliable choice for routine detection method of these bacteria species in chick gastrointestinal contents.
  A.R. Seidavi , A.R. Bizhannia , M. Ghanipoor and A.A.A. Qotbi
  Aim of this research was investigation on improvement possibility of resistance, production and reproduction traits in 3P, 2P and P generations in three Japanese pure lines of silkworm Bombyx mori L., using individual selection in 3P generation parent`s level. At silk cocoon production process and silkworm breeding programs, reproduction traits supplies silkworm egg producers, cocoon quantitative and resistance traits supplies farmers` benefits. Hence it must be noticed to these traits together. Furthermore, selection systems applied in 3P pure line levels. Reproduction, production and resistance characters have negative correlations probably in some varieties. Therefore, an experiment must be designed to investigation on effect of parent`s selection on the basis of cocoon weight on reproduction and resistance characters in 3P, 2P and P generations. At each pure line including 31, 103 and 107, it is recorded male and female cocoon weight and then 16 sire and dam parents were selected accordingly the most weight at each line. Furthermore, 16 sire and dam parents were selected by chance and without any selection at each line. These three pure lines were reared in 3P, 2P and P generations and investigated and compared their resistance, production and reproduction traits separately. From obtained results, it was showed that phenotypic trend for cocoon weight is positive and significant (p<0.01). It is showed that parental selection on the basis of single cocoon weight in 3P generation, had not decrease reproduction and resistance characters at next generations of 3P, 2P and P significantly (p<0.01). Hatchability, defected eggs percentage and pupae vitality were not declined significantly in three studied pure lines (p<0.01). These results could due non-negative correlations between these traits in three studied pure lines. From obtained results, parents would be selected on the basis of cocoon weight parameters in 3P generation. Also it is recommended that economical coefficients and genetical parameters are noticed for reproductive, resistance and quantitative cocoon characters together.
  M. Salehi Nezhad , S.Z. Mirhosseini , S. Gharahveysi , M. Mavvajpour and A.R. Seidavi
  The present study aims at shedding more light to larval duration and development of silkworm lines from Iranian silkworm gene bank and comparison of the results using statistical models for selection of the superior strains. Feeding and other conditions of larval rearing were conducted following the standard procedure and all germplasm strains were reared under standards protocols in all rearing steps. From obtained results, it is showed that the larval duration of the 101 (608.000 h), 5118x10133-3-3 (588.670 h), 307-300-2 (584.000 h), 105 (584.000 h) and 31 (584.000 h) strains remained significantly at upper level than other strains, respectively. The feeding larval duration in B2-09 (574.000 h), N19 (533.000 h), 1433-9 (525.000 h), BH-2 (517.330 h) and 1433-15 (511.330 h) strains increased significantly in comparison with other strains. Molting larval duration remained significantly at upper level in I 20 (197.670 h), 107-K (113.000 h), Black Larvae-White Cocoon (104.000 h), 101(104.000 h) and Shaki (103.000 h) increased significantly in comparison with other strains. From obtained results, it is showed the 1-3 instars larval duration of the Black-White (292.670 h), 101 (290.000 h), 1003-5 (288.670 h), 101xF6 (286.000 h) and 31 (286.000 h) strains remained significantly at upper level than other strains, respectively. Totally, 7409 (577.881), Black Larvae-White Cocoon (577.508), 236 (570.769), M-1-2(5) (568.583) and T5-M (566.602) showed higher evaluation index values. Also, 7409 (5.374), 236 (5.267), T5-M (5.183), 113-K (5.163) and White Larvae-Yellow Cocoon (5.027) showed higher sub-ordinate function values.
  M. Salehi Nezhad , S.Z. Mirhosseini , S. Gharahveysi , M. Mavvajpour and A.R. Seidavi
  This study was conducted in ordered to analyze of phylogenetic relationships and determination of relationship amounts in all peanut cocoon strains of Islamic Republic of Iran germplasm based on reproductive characteristics. Hierarchical agglomerative clustering was done by using NTSYS-pc, version 2.02e based on complete, single, UPGMA, UPGMC, FLEXI approaches and SAS-pc based on WARD and average approaches. However, method of average linkage between groups under UPGMA (Unweighted Pair-Group Method using Arithmetic average) was considered as major and final protocol for data conclusion and the resulting clusters were expressed as dendrograms. Various methods generated similar dendograms. This study reveals the phylogenetic relationship of peanut cocoon strains of Iran germplasm. Based on data from studied characters, we constructed dendrograms that resolved the 51 silkworm strains into 2 major clusters. However, the strains of the same origin did not grouped together, demonstrating they can have different biological and development performance. First cluster divided into one sub-group included five strains. However, second cluster divided into two sub-groups. Other strains were grouped together and far from other silkworm strains, indicating they might be suitable for future crossings, maintenance of parental strains and hybridizations with oval cocoon strains so as to maximize heterosis and to avoid depression inbreeding.
  A. Shabdini , A.R. Seidavi , S. Gharahveysi and S.Z. Mirhosseini
  Considering the lake of sufficient information in connection with the three commercial line of silkworm 32, 104, 110 of Islamic Republic of Iran, the objective of research is to investigate the effect of sex, generation, line on economic cocoon traits in these 3 commercial lines. Economic cocoon traits of 3 lines 32, 104, 110 by utilizing 11259 records obtain from four generation in Iran Silkworm Research Center (ISRC) was assessed. The fixed effect of sex, generation, line on traits studied were significant (p<0.01). The commercial lines regarding cocoon traits were also significant which demonstrated the various genetic diversities of commercial lines of silkworm. The total average of the cocoon weight was measured at 1.667±0.0045. The averages of Cocoon Weight trait (CW) in line 32, 104, 110 were 1.734±0.0084, 1.6997±0.0047 and 1.5654±0.0066, respectively. The effect of line was very significant (p<0.001). The effect of the generation was significant too (p<0.001) and the average of 1st generation was higher than other generations and after that there were 3rd, 2nd and 4th generations. The effect of sex was very significant and the average of CW in females and males were 1.85±0.005 and 1.48±0.003 g, respectively. Total mean of Cocoon Shell Weight (CSW) was 0.3618±0.0009 and average of this trait in line 32, 104 and 110 were 0.3902±0.0016, 0.3675±0.0013 and 0.3268±0.0019 g. Effect of all fixed effects were significant on cocoon shell weight. Total average of Cocoon Shell Percentage (CSP) was 21.89±0.044. Average of this trait in line 32, 104 and 110 were 22.736±0.789, 21.8416±0.752 and 21.0677±0.694%. All of the fixed effects were significant on this trait. Average of 1st generation for this trait was 23.794±0.184 and the average of 2nd, 3rd and 4th generations were measured at 21.723±0.079, 21.936±0.081 and 21.628±0.072, respectively. In addition the value of this trait was higher in male than female.
  S.M.H. Mirhoseini , M. Heydari , A. Shoulaie and A.R. Seidavi
  In order to test the effect of radio frequencies in rice and wheat flour pest control, the samples were dirtied by Tribolium confusum flour pest and Sitophilus oryzae rice pest. The wheat flour pests were radiated at 13.56 MHz in 10, 20, 30, 40, 45 and 60 sec, at 27.12 MHz in 5, 10, 20, 25, 30, 35 and 60 sec and at 40.68 MHz in 5, 10, 20, 12, 15 and 60 sec. The rice samples were heated at 13.56 and 27.12 MHz in 60, 75, 85, 95 and 105 sec. After above mentioned times, the number of died insects were counted. Quality test of treated flour and rice samples were done after treatments. Based on the results, the mortality of wheat flour pests after 45 sec at 13.56 MHz reaching 45°C, after 35 sec at 27.12 MHz reaching 46°C and after 15 sec at 40.68 MHz reaching 47°C was 100%. Temperature sensitivity of Tribolium confusum at 13.56, 27.12 and 40.68 MHz frequencies were 40, 38 and 43°C, consequently. Also, the results demonstrated that the mortality of rice pests after 105 sec at 13.56 MHz, reaching 57°C and after 95 seconds at 27.12 MHz, reaching 58°C was 100%. Temperature sensitivity of Sitophilus oryzae at 13.56 and 27.12 MHz frequencies were 48 and 50°C, in order. The combination of the results showed that pest control potency and intensity increases as frequency rises.
 
 
 
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