Majid Darvishi کارشناس ارشد، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه ‏ author Manouchehr Soori استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه ‏ author Hamid Reza Ansari Ranani عضو هیأت علمی مؤسسه تحقیقات علوم دامی کشور، کرج‏ author text article 2007 per The follicle arrangement and secondary to primary follicle ratio (S/P) were studied in the ‎skin of nine male and nine female Markhoz goats breed from one week to 16 weeks of age. The ‎skin samples were taken from mid-side area of each animal in nine stages every other week. The ‎follicles were arranged in groups, predominantly including three primary and several ‎secondary follicles. Each primary follicle associated with sudoiferous gland, bilobed sebaceous ‎gland and erector pili muscle and each secondary follicle associated with only monolobed (and ‎some bilobed) sebaceous gland. The mean of S/P ratio was significantly different in different ‎stages (except stages six and seven) (P ? 0.05). The maximum S/P ratio was observed at 16 ‎weeks after birth. Effect of sex and interaction of sex and age on S/P ratio was not significant ‎(P > 0.05).‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 1 10 https://joa.ut.ac.ir/article_27973_a2d1a2d815157c6af83955e4375b601e.pdf Mahmoud Sanadgol کارشناس ارشد، گروه گیاهپزشکی، پردیس ابوریحان، دانشگاه تهران، تهران‏ author حشمت اله امینیان استادیار، گروه گیاهپزشکی، پردیس ابوریحان، دانشگاه تهران، تهران ‏ author Hassan Reza Etebarian استاد، گروه گیاهپزشکی، پردیس ابوریحان، دانشگاه تهران، تهران ‏ author Giti Abolhasan بخش سم¬شناسی، اداره کنترل دارو و غذا، تهران ‏ author Omid Sabzevari دانشکده داروسازی، دانشگاه علوم پزشکی تهران‏ author text article 2007 per Isolates of A. flavus obtained from different feeds such as corn, barley, wheat, cotton ‎seed, bread waste, soybean, alfalfa, wheat bran, barley meal, canola meal, corn silage and beet ‎pulp from nine dairy farms in Tehran province during 2004. Ability of sclerotiom production by ‎isolates was tested. Results showed 62.9 percent of isolates produced sclerotiom on CzA medium ‎and 68.5 percent of these isolated were aflatoxigenic. From pollution of feed by A. flavus point of ‎view in dairy farms were between 20.37 - 3.7 percent. 16.67 percent of isolates obtained from ‎beet pulp as the most contaminated feed. Alfalfa, canola meal and corn meal with‏ ‏medium 1.8 ‎percent were of the least in every contaminated feeds. Analysis of milk samples by HPLC ‎showed that the rate of AFM1 in samples varied and ranged from 0.0009 to 0.5269 ppb. ‎Calibration regression coefficients determined 0.99 to 0.997 for these experiments and ‎determined recovery was between 70.31 to 1.4.93 percent in these experiments. ‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 11 21 https://joa.ut.ac.ir/article_27974_6581b1e881ce021d30469f47f5525ff3.pdf Mohammad Mehdi Moeini استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه ‏ author Manouchehr Soori استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه ‏ author Farzin Hazhbari استادیار، گروه علوم دامی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه ‏ author Ebrahim Nourian مربی، گروه دامپزشکی، دانشکده دامپزشکی دانشگاه رازی، کرمانشاه‏ author text article 2007 per An experiment conducted to evaluate the level of molybdenum, sulphur and iron ‎supplement on the copper status and clinical deficiency in Iranian sheep and goat. Eight of one ‎year -old Sanjabi sheep and Markhoz goats housed in individual crates in animal house of Razi ‎University. Animals fed with the same basal diet which was supplemented with different levels of ‎minerals of Mo, S and Fe during five months experiment. Blood samples were collected in EDTA ‎containing tubes to measure plasma copper and thiomolybdate. Wool and Mohair samples were ‎collected by taking patch samples (10 × 10 cm2) from the mid-side area of the animals every ‎three weeks to measure copper content and quality parameters. Supplementing the diet with 30 ‎mg molybdenum, 400 mg iron and 2.5 g sulfur /kg DM produced sub clinical copper deficiency ‎with minor dipigmentation of fleeces and mohair and poorer crimp being observed. The ‎response to high levels of molybdenum, iron, and sulfur in sheep and Markhoz goat was ‎different. The fiber diameter significantly reduced after four months of experiment especially in ‎goat mohair.‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 37 46 https://joa.ut.ac.ir/article_27975_44e7a0d439cd27ebb8b1d80551bcbd65.pdf abolghasem Sharifzadeh استادیار، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان ‏ author Khalil Kalantari دانشیار، دانشکده اقتصاد و توسعه کشاورزی، دانشگاه تهران، تهران ‏ author Seyed Mahmoud Hosseini استادیار، دانشکده اقتصاد و توسعه کشاورزی، دانشگاه تهران، تهران ‏ author Ali Asadi استادیار، دانشکده اقتصاد و توسعه کشاورزی، دانشگاه تهران، تهران ‏ author Gholam hossein Abdollah zadeh دانشجوی دکتری دانشکده اقتصاد و توسعه کشاورزی، دانشگاه تهران، تهران ‏ author text article 2007 per This research was based on survey strategy with the aim to study factors influencing research ‎function of agricultural faculty members. The population of this research consisted of all faculty ‎members of public agricultural faculties and colleges of Ministry of Scientific, Research and ‎Technology (N = 1260). Using multi-phase sampling method, 172 faculty members were selected and ‎studied. Validity of questionnaire as data gathering instrument, confirmed by selected faculty ‎members and researchers, and Coronbach Alpha coefficient (equal to .74) used to confirm its ‎reliability. The results of priority setting of research functions based on coefficient of variation shows ‎that agricultural faculty members, mostly engaged in postgraduate research and their participation ‎in research outreach and international research collaboration is so partial and limited. Calculated ‎Pearson coefficients of correlation indicated significant relationship between a number of personal ‎and professional variables of faculty members (participation in training workshop and ‎courses, ‎professional‏ ‏internet usage, research project, etc) and their research function. Stepwise regression ‎analysis led to a linear equation including several personal and professional variables and R2Ad ‎coefficient indicated that this linear equation, explained 70 percent of variance of research function of ‎faculty members as dependent variable.‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 47 62 https://joa.ut.ac.ir/article_27976_7a7491b8a2c3f5210b6a6a5588e53513.pdf Akbar Mohammad arab hosseini استادیار، گروه مکانیک ماشین های کشاورزی، پردیس ابوریحان، دانشگاه تهران author Hadi Samimi Ajhijahani کارشناس ارشد گروه مکانیک ماشین های کشاورزی، پردیس ابوریحان، دانشگاه تهران author Hamed Mehr avar کارشناس ارشد، گروه مکانیک ماشین های کشاورزی، پردیس ابوریحان، دانشگاه تهران author Jafar Massah استادیار، گروه مکانیک ماشین های کشاورزی، پردیس ابوریحان، دانشگاه تهران author text article 2007 per Mechanical weeding is one of the non-chemical methods to control weeds. In this paper a ‎new mechanism has been presented for mechanical cultivation. The machine works based on ‎the manual tools operation, which farmers still use in small scale for weeding and consists of a ‎number of four-bar linkage mechanisms. Each mechanism consists of a blade which moves ‎forward (active course) and backward (passive course). The three precise position methods ‎were applied to design the mechanism. The Matlab software was used for solving the equations ‎and drawing the path of motion. Considering the parameters and solving the equations, a four-‎bar linkage (crank-rocker) was proposed.‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 63 76 https://joa.ut.ac.ir/article_27977_a2c6fb36adb7002c8483ff9c0d335bbf.pdf Mehdi Shokouhmand کارشناس ارشد مرکز تحقیقات کشاورزی و منابع طبیعی استان یزد author Mohammad Ali Emami Meibodi عضو هیات علمی مرکز تحقیقات کشاورزی و منابع طبیعی استان یزد author text article 2007 per In this study traits of body weight in different ages and effect of selection on breeding value ‎at 42 days were investigated in three strains of Japanese quail for two generation. In the first ‎generation 51 male and 51 female of each strain were randomly selected from the base ‎population and one male with one female were located in‏ ‏each cage. Body weight‏ ‏‎(BW) of the ‎progeny was measured at 14, 28, 42 and 49 days of age. For the second generation in White, ‎Canadian Wild and Brown strains a number of 30, 40 and 35 pairs of male and female birds ‎that have the highest BV were selected. Mean differential of breeding value in two generations ‎for male and female in White strain were 10.7 and 10.2 gr, in Canadian wild strain were 8.6 and ‎five gr and in Brown strain were four and 9.1 gr, respectively. Heritability of BW at 14, 28 and ‎‎42 days for White strain was 0.37, 0.26, 0.74, Canadian wild strain was 0.21, 0.17 and 0.44 and ‎for Brown strain were 0.39, 0.45 and 0.52, respectively. ‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 23 35 https://joa.ut.ac.ir/article_27978_cbe582b401eb70a4444c664ef1c9382f.pdf Hassan Ghahhari استادیار، گروه کشاورزی، دانشگاه آزاد اسلامی واحد شهرری، تهران ‏ author Sohrab Imani استادیار، گروه حشره‌شناسی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران‏ author Kamran Parvanak استادیار، گروه کشاورزی، دانشگاه آزاد اسلامی واحد شهرری‏ author text article 2007 per The effect of four concentrations (0.5, 1, 2.5, and 5 mg/lit) of two insect growth regulators ‎‎(IGRs) of Buprofezin and pyriproxifen on 1 and 4-day eggs, different nymphal instars, and ‎pupae of Trialeurodes vaporariorum (Homoptera: Aleyrodidae), was studied at 26 ± 2 °C, 80 ± ‎‎5% RH, and 16: 8 (L: D) on Lantana camara in the greenhouse. The effect of both IGRs was ‎positively related to increasing of concentrations. The susceptibility of one-day eggs of T. ‎vaporariorum to the insecticides was more than four-day ones, and also early nymphal instars ‎‎(1st and 2nd) than 3rd, 4th, and pupa. The mean percentage of adult eclusion from first to fourth ‎nymphal instars and pupa in 2.5 mg/liter of pyriproxifen was 0, 0, 0, 61.32 ± 11.06, and ‎95.73 ± 3.66, in 5 mg/liter of it was 0, 0, 0, 54.16 ± 10.55, and 98.09 ± 1.14, in 2.5 mg/liter of ‎buprofezin was 19.88 ± 7.67, 48.35 ± 12.05, 60.28 ± 11.34, 85.84 ± 7.18, and 91.85 ± 6.55, and in 5 ‎mg/liter of it was 12.15 ± 4.60, 34.72 ± 8.96, 45.92 ± 7.87, 79.27 ± 8.95, and 92.28 ± 7.13 percent, ‎respectively. ‎ دانشگاه تهران 5524-1562 9 v. 2 no. 2007 77 89 https://joa.ut.ac.ir/article_27979_8d0ce7b687d63ba7fb270c8cfe193067.pdf