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Articles by Yahya Ebrahim-Nezhad
Total Records ( 4 ) for Yahya Ebrahim-Nezhad
  Yahya Ebrahim-Nezhad , Ghassem Habibi Bibalani , Ebrahim Jafari Helan , Keyvan Hatefi Nezhad , Jalil Dolgari Sharaf and Roya Ebrahim-Nezhad
  This experiment was conducted to evaluate the combined effect of ethylenediaminetetraacetic acid (EDTA) and microbial phytase on the concentration of minerals of serum and parameters of mineralization of tibia in Hy-line commercial layers (W-36) in 53-64 weeks of age. One hundred and ninty two of laying hens were tested. The experimental design was completely randomized design with a 3x2 factorial arrangement with three levels (0, 0.1 and 0.2%) of EDTA and two levels (0.0 and 300 FTU kg-1) of microbial phytase in low available phosphorus diets with 6 treatments, 4 replicates and 8 hens in each replicate. The concentration of zinc, cupper and manganese of serum and ash, calcium and phosphorus of tibia was evaluated. The results showed that adding of EDTA into low available phosphorus diets significantly affected the concentration of serum zinc and tibia ash calcium (p < 0.05). Interaction between EDTA and microbial phytase significantly affected the concentration of copper and manganese in serum and tibia ash percentage (p < 0.01). Using 300 FTU kg-1 microbial phytase into low available phosphorus diets increased tibia ash phosphorus percentage (p < 0.01).
  Tohid Vahdatpour , Kambiz Nazer-Adl , Yahya Ebrahim-Nezhad , Naser Maheri-Sis and Sina Vahdatpour
  This experiment was conducted to determine the effects of increasing, energy to protein ratio and partial decreasing of nutrient contents of diet using different levels of fats on broiler chickens performance and serum lipids. With addition of fats (Poultry oil, Soybean oil and Tallow) in two levels (4 or 8%) to basal diet that was already balanced on NRC (1994) recommendations, seven different non-isocaloric and non-isonitrogenic diets were prepared (12 or 24% increasing of energy to protein ratio in 4 or 8% of fat level addition, respectively) and given ad libitum between 22 to 49 day of age. The blood samples were collected at 35 and 49 day and weight of selected visceral organs were recorded at 49 day. The results suggested that high fat intake had no significant effect on Final Body Weight (FBW) and Feed Conversion Ratio (FCR). Numerically the FBW was higher in all groups that received high fat levels than control group. But abdominal fat deposition only in birds that was fed by additional soybean oil and tallow in 4% level was constant. The liver weight significantly decreased (p<0.01) and abdominal fat weight significantly increased (p<0.05) by elevation of fat level. Serum lipids concentrations had no significant difference in dietary treatments. Serum LDL concentration showed significant elevation from 35 to 49 day (p<0.01), whereas serum cholesterol concentration showed decline at the same times (p<0.05). With increasing of dietary fat level from 4 to 8%, serum cholesterol had showed elevation (p<0.05). Therefore, it seems that broilers are more resistant against the high dietary fat intake and they can be effectively used for nutritional and growth requirements promoting, without mortality.
  Reza Montazer-Sadegh , Yahya Ebrahim-Nezhad and Naser Maheri-Sis
  This study was conducted to determine the replacement of different levels of rapeseed meal with soybean meal as protein source on broilers performance (7 to 49 day old). Experiment design consisted under completely randomized design of a 5 arrangement of dietary treatments with five replicates, a total of 375 (1-day-old) commercial broiler chicks (Ross-308) were randomly distributed into 25 groups consisting of 15 chicks per group. The treatments were (0.0, 4, 8, 12 and 16%) levels of rapeseed meal. The criteria used to assess were weight gain, feed consumption, feed conversion ratio and internal organs weight. Increasing of body weight between treatment in different levels of rapeseed meal and control group showed significant difference (p<0.05). Maximum weight gain belonged to treatment contain 8% and minimum weight gain belonged to treatment contain 16% rapeseed meal. Feed consumption between treatments in different levels of rapeseed meal showed significant difference (p<0.05). However, rapeseed meal had positive effect on feed consumption. Maximum feed consumption belonged to control group and minimum feed consumption belonged to treatment contain 16% rapeseed meal. Feed conversion ratio between treatment in different levels of rapeseed meal showed significant difference (p<0.05). Minimum feed conversion ratio belonged to treatment contain 16% rapeseed meal and maximum feed conversion ratio belonged to control group. There was significant difference between percentage weights of abdominal fat in different levels of rapeseed meal (p<0.05). But there was no significant difference between percentage weights of intestine, liver, pancreas and carcass yield of treatments (p>0.05).
  S.R. Riyazi , Yahya Ebrahim-Nezhad , Kambiz Nazer-Adl , Naser Maheri-Sis , T. Vahdatpour and P. Fouladi
  This study was conducted to determine the effect of replacing different levels of rapeseed meal with soybean meal on the performance of commercial laying hens. Four levels of rapeseed meal; 0, 5, 10 and 15% were used in diets of 144 Hi-Line (W-36, Strain) laying hens from the age of 44 to 56 weeks. Hens were distributed in a randomized complete block design with 4 treatment, 3 replicates and 12 hens in each replicate. The parameters measured were the feed intake, hen-day egg production, egg mass, feed conversion ratio and egg weight. With increasing of rapeseed meal level in diets, feed intake was showed elevation (p<0.05). Egg weight was significantly higher when birds fed 10% rapeseed meal (p<0.05). No specific trend was observed on the effect of rapeseed meal on egg mass and feed conversion ratio, however these parameters were higher in groups that fed 10% rapeseed meal. With increasing rapeseed meal in diets, production ratio was decreased. It was concluded that; the replacement of 10% rapeseed meal with soybean meal in the layer diets might be useful and had economical benefits for producers.
 
 
 
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