Department of Poultry Science (2013 - Present)
Animal Science-Poultry Nutrition
Animal Science, Ferdowsi University of Mashhad, Mashhad, Iran
Animal Science-Nutrition and Feeding
Animal Science, University of Guilan, Rasht, Iran
Animal Science
Animal Science, Ferdowsi University of Mashhad, Mashhad, Iran
Research field: Analysis of Agriculture-Animal systems (network, optimization, data science)
Expert:
Phone: +98(21)48292360
Address: Pajouhesh Blv. Tarbiat Modares University, Tehran, Iran, 14115-336
Dr. Hamed Ahmadi Born in December 1980 in Yazd, Iran. Primary and High School (Iranshahr School), Yazd (1986-1999). He earned BSc in the field of Animal Science from the Ferdowsi University of Mashhad (2000-2004), MSc in the field of Animal Feed and Nutrition from the University of Guilan (2004-2007), and PhD of Poultry Science from Ferdowsi University of Mashhad (2007-2013). Visiting scholar through a Sabbatical leave, University of Hohenheim, Stuttgart, Germany, working on the Modeling and optimization the nutritional system (2011-2012). In January 2013 he was joint as an Assistant Professor for Bioscience and Agriculture Modeling to the Department of Poultry Science in the College of Agriculture at Tarbiat Modares University. His main responsibilities are to conduct research through the multidisciplinary projects on Agriculture-Nutrition-Animal-Modeling-Data Science and to teach and direct graduate students at MSc and PhD levels. In mid of 2014, he established a research unit entitled Bioscience and Agriculture Modeling Research Unit in the faculty of agriculture, since then he run the unit and data-lab as director. Hamed, holds memberships in the Poultry Science Association (PSA), Worlds Poultry Science Association (WPSA), and Iranian Society for Animal Science, also contributes in Editorial boards of several scientific journals. He was the Associate Editor for Poultry Science during a 7-year period starting from 2009.
The current study was conducted to evaluate the effect of dietary camphor levels as a medicinal feed additive to improve semen quality, antioxidant capacity, reproductive hormones, and reproduction performance in roosters. For this purpose, thirty-five 29-wk-old Ross 308 broiler breeder roosters randomly were assigned to five experimental groups (seven birds/group) and received five doses of camphor containing 0, 50, 250, 750, and 1000 mg camphor/kg of feed for 12 wk consecutive. Semen quality parameters and motion characteristics of sperm were evaluated every 28 days and semen antioxidant capacity and plasma reproductive hormones concentration were tested at the end of the experiment. Also, at the end of the experiment, reproductive perfor
In the present study Box Behnken Design (BBD) and Artificial Neural Network-Genetic Algorithm (ANN-GA) hybrid system were used for predicting and optimizing a new organic-based postharvest sanitizer for fresh pistachio nuts under modified atmosphere packaging, combining different concentrations of five generally recognized as safe (GRAS) ingredients including H2O2 (1, 3 and 5%), Na2CO3 (1, 3 and 5%), K2CO3 (1, 3 and 5%), citric acid (CA) and acetic acid (AA, 1000, 5500 and 10,000 mg L−1). The nuts were submerged in sanitizer solutions for two minutes then dried for five minutes in ambient condition and packaged in polyethylene bags injected with ambient atmospheric gas (21% O2, 0.03% CO2, and 87% N2). BBD as a computer-based design of
Paclitaxel is the top-selling anticancer medicine in the world. In vitro culture of Corylus avellana has been made known as a promising and inexpensive strategy for producing paclitaxel. Fungal elicitors have been named as the most efficient strategy for enhancing the biosynthesis of secondary metabolites in plant cell culture. In this study, endophytic fungal strain HEF 17 was isolated from C. avellana and identified as Camarosporomyces flavigenus. C. avellana cell suspension culture (CSC) elicited with cell extract (CE) and culture filtrate (CF) derived from strain HEF 17, either individually or combined treatment, in mid and late log phase was processed for modeling and optimizing growth and paclitaxel biosynthesis regarding CE and CF co
Responses of broiler chickens to dietary glycine equivalent (Gly equi) are affected by dietary cysteine and choline. Hence, this study investigated interactive effects among dietary Gly equi, cysteine, and choline on the growth of broiler chickens. Male Ross 308 broiler chickens were maintained in 105 metabolism units (10 birds/unit) from days 7 to 22. Excreta were collected in 12-h intervals from days 18 to 21. Blood was sampled on day 22 (1 bird/unit). Five levels each of Gly equi (9–21 g/kg), cysteine (2–5 g/kg), and choline (0.5–1.7 g/kg) were tested under 15 diets in 7 replicates each following a fractional central composite design. Another diet was provided to five metabolism units (15 birds/unit) to measure prececal amino acid
The biological procedure used to determine the nitrogen-corrected True Metabolizable Energy (TMEn) value of feed ingredient is costly and time consuming. Therefore, it is necessary to find an alternative method to accurately estimate the TMEn content. In this study, 2 methods of Multiple Linear Regression (MLR) and Artificial Neural Network (ANN) were developed to describe the TMEn (Kcal kg-1 DM) value on a Dry Matter (DM) basis of Wheat Bran (WB) samples given their chemical composition of Ether Extract (EE), ash, Crude Protein (CP) and Crude Fiber (CF) contents (all used as% of DM). A data set containing 100 WB samples were used to determine chemical composition and TMEn. Accuracy and precision of the developed models were evaluated given
The present study proposes a Gaussian process regression (GPR) approach to develop a model to predict true metabolizable energy corrected for nitrogen (TMEn) content of corn samples (as model output) for poultry given levels of feed chemical compositions of crude protein, ether extract, crude fiber, and ash (as model inputs). A 30 corn samples obtained from 5 origins [Brazil (n = 9), China (n = 5), Iran (n = 7), and Ukraine (n = 9)] were assayed to determine chemical composition and TMEn content using chemical analyses and bioassay technique. In addition to GPR model, data were also analyzed by multiple linear regression (MLR) model. Results revealed that corn samples of different origins differ in their gross energy and chemical compositio
Four nonlinear models including Logistic, Gompertz-Laird, Richards, and von Bertalanffy were compared to achieve the best prediction of growth parameters describing the growth curve in a crossbred chicken population. Growth data (weekly body weights of chicken from birth to 84 days of age) were collected on 303 birds (174 females and 129 males) of F2 cross of the Arian line broiler chicken (Line B) and Urmia native chicken. Some statistical criteria such as Akaike Information Criterion (AIC), Corrected Akaike Information Criterion for small sample sizes (AICc), and Bayesian Information Criterion (BIC) were used to find the best model. The results showed that the estimated values of the initial weight (W0) and final Weight (Wf) in male were
An experiment was conducted to investigate the effects of using gelatin as a partial protein source and protease in broilers diets. The experiment was carried out as a factorial arrangement, containing two levels of protease (0 and 200 gs per ton of diet) and four levels of gelatin (0, 2.82, 4.23 and 5.64% of the diet replacing 12.5, 18.75 and 25% of the SBM protein, respectively) with 6 replicates and 15 chicks in each pen. Body weight, feed intake and FCR were measured at day 7, 21 and 35. Ileal digesta viscosity, ileal morphology and ileal coliform and lactobacilli population were measured at day 35. In addition, apparent protein digestibility was determined between 28 and 35 days of age. Results show that the highest inclusion rate of g
Context Gelatin, presently a waste material from animal tissues and bones, may be suitable as a partial dietary replacement for soybean meal. In combination with protease, it may enhance growth performances of broiler chickens. However, limitations when introducing gelatin, are its unusual amino acid profile and digesta viscosity. Aim An experiment was conducted to elucidate effects on growth performance, blood biochemistry, carcass and meat characteristics, and feed costs of partial replacement of soybean meal with gelatin and protease in broilers diets. Methods The experimental design was a factorial arrangement of two levels of mono-component protease (0 and 200 g/t diet) and four levels of gelatin (0%, 2.82%, 4.23% and 5.64% of the diet
The goal of this study was to determine regression equations to predict metabolizable energy of wheat samples given their chemical?compositions using meta-analytical approach. A database compromising chemical compositions and apparent metabolizable energy corrected??for the nitrogen (AMEn) of 111 published sources of wheat strains was used. Sample information contains crude protein (CP), ether extract?(EE), crude fiber (CF), ash and AMEn. Average values for AMEn was calculated as 2917.46 (kcal/kg), while for the CP, EE, CF, ash was?calculated as 12.53, 2.12, 1.61and 1.56 (% dry matter), respectively. Meta-regression equations for predicting AMEn wheat based on?chemical composition were developed and evaluated by means of provided database.
This study was conducted to assess the effects of dietary flaxseed and sesame oils, on the semen parameters, fatty acid composition of sperm?as well as the fertility and hatchability eggs from aged roosters. In a completely randomized design, 24 Ross-308 roosters (aged 45 week)?assigned to four groups, comprising six replicates and one bird in each. The birds received different diets including basal diet (control), basal?diet supplemented with 2% flaxseed oil (FO), basal diet supplemented with 2% sesame oil (SO) and basal diet supplemented with 1%?flaxseed oil and 1% sesame oil (MO). The diets were iso-caloric and iso-nitrogenous, containing the same level of vitamin E. The roosters?were fed diet for 60 days, during which semen samples were
The purpose of this study was to determine the contents of chemical compositions, apparent metabolizable energy (AME), apparent metabolizable energy corrected for nitrogen (AMEn), true metabolizable energy (TME), true metabolizable energy corrected for nitrogen (TMEn), in corn samples, as well as to predict diferrent energy contents of corn samples given their chemical components. A total of 30 samples were colleted from Iranian poultry feed plants. Metabolizable energy criterias of each sample were obtained by percision feeding method with 4 replications. Based on laboratory assessments, average of dry matter, crude protein, crude fat, crude fiber, ash, starch and glucose were 90.02, 9.15, 3.28, 3.93, 1.45, 65.33 and 9.79 (% of DM), respec
An experiment was conducted to investigate the supplementation of two commercially available multistrain probiotics as an alternative to antibiotics on growth performance, intestinal morphology, lipid oxidation and ileal microflora in broiler chickens. A total of 280‐day‐old ROSS 308 mixed‐sex broiler chickens with an average initial body weight of 42???0.5?g were randomly divided into four treatments with five replicate cages of 14 birds each cage in a completely randomized design and fed with the following diets for 42?day: (a) control (CON) (antibiotic‐free diet), (b) antibiotic (ANT) (CON?+?Avilamycin 150?g/ton feed), (c) probiotic A (CON?+?Protexin? 150?g/ton feed) and (d) probiotic B (CON?+?Bio‐Poul? 200?g/ton feed). The re
Reproductive performance in aged broiler breeder roosters is not desirable. The purpose of this study was to assess the effects of dietary flaxseed oil and vitamin E on the semen parameters, hormonal profiles, fatty acid analysis of sperm, and fertility performance of aged roosters. Twenty four roosters were assigned into four treatments and received their diets as following: 1) basal diet as control group (CTRL), 2) basal diet supplemented with 200?mg/kg vitamin E (CTRL?+?VITE), 3) basal diet supplemented with 2% flaxseed oil (FLAX) and 4) basal diet supplemented with 2% flaxseed oil plus 200?mg/kg vitamin E (FLAX?+?VITE). Roosters were fed their diets for 60 days and then, different characteristics of reproduction in the roosters were exa
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