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Articles by Mehran Torki
Total Records ( 3 ) for Mehran Torki
  Mohammad Zarei , Mohammad Ehsani and Mehran Torki
  Problem statement: This study was conduct to compare effects of various commercial feed additives on performance of laying hens. Approach: To evaluate effects of dietary inclusion of feed additives (Yeasturer, A-Max, Thepax, Fermacto and Biomin) on performance of laying hens, 216 Lohmann LSL-Lite hens were divided in 36 cages (n = 6). Approach Hens in 6 cages (replicates) were assigned to feed on one of the 6 iso-caloric and iso-nitrogenous experimental diets (ME = 2720 Kcal Kg-1 and CP = 145 g kg-1) including control and diets with 0.5 g kg-1 of feed additives. Collected data of Feed Intake (FI), Egg Production (EP), Egg Weight (EW), Egg Mass (EM) and calculated Feed Conversion Ratio (FCR) during 6-week trial period was analyzed based on completely randomized design using GLM procedure of SAS. Results: Dietary additive inclusion significantly affected on EW on 1-3 and 3-6 weeks. Feed additive did not have significant effect on EP, FCR, FI and EM. There was no significant difference in EP, EM, FI and FCR among the experimental groups. Hens received Yeasturer or A-Max showed improved EW compared to hens fed the control diet during weeks 1-3. Hens fed diets included additives showed improved egg shell weight and thickness compared to hens fed the control diet. There was no significant effect of dietary treatment on blood levels of cholesterol, TG and HDL. Adding Thepax or Biomin to diet significantly reduced blood levels of LDL compared to hens fed the other experimental diets. There was no significant effect of dietary treatment on diacritical counts of white blood cells. Conclusion/Recommendations: According to the results of the present study, probiotic Yesture and A-Max can be included in laying hens diets to improve EM. In addition, the commercial feed additives (Yeasturer, A-Max, Thepax, Fermacto and Biomin) used in this study had beneficial effects on egg shell quality characteristics in terms of shell weight and thickness and to decrease egg abnormalities due to poor shell, these feed additives could be recommendable.
  Mohammad Ehsani and Mehran Torki
  Problem statement: Using Guar Meal (GM) in poultry diets has being limited because of having β-mannan, one of the Nonstarch Polysaccharides (NSP). In this study we try evaluating effects of enzyme supplementation of GM-included diets on productive performance of laying hens. Approach: A total number of 144 Lohmann LSL-Lite hens were divided in 24 cages (n = 6). Based on a 3 x 2 factorial arrangement of treatments, six iso-caloric and iso-nitrogenous diets including 3 levels of GM (0.0, 35.0 and 70.0 g kg-1) with and without enzyme (Hemicell® a β-mannanase-based enzyme, 0.0 and 0.6 g kg-1) were assigned to hens in 4 cages (replicates). Data was analyzed based on completely randomized design using GLM procedure of SAS. Results: Dietary GM inclusion significantly affected on Egg Production (EP) on weeks 2, 4 and 6 as well as the overall trail period. Hens fed the GM-included diets did have decreased EP compared to hens fed the control diet. Almost the same trend was observed in terms of Egg Mass (EM); so that hens fed the GM-included diets showed decreased EM compared to the hens fed the control diet. Enzyme supplementation did not have significant effect on EP in the present experiment, but EM was significantly improved in the hens fed the β-mannanase-supplemented diets on weeks 3, 6 and the overall experimental period. Dietary inclusion GM increased Feed Conversion Ratio (FCR) of laying hens compared to the hens fed the control diets on weeks 2, 4, 6 and overall trial period. Conclusion/Recommendations: Including GM in laying hens’ diets more than 3% may decrease productive performance. Supplementing corn-soybean or corn-soybean-GM diets by β-mannanase would have beneficial effects on performance of hens especially in terms of FCR and EP.
  Reza Mahdavi and Mehran Torki
  This study was undertaken to investigate the effect of dietary inclusion of protected Butyric Acid (BA) glycerides on growth performance, gastrointestinal tract parameters, carcass traits, blood metabolites and humoral immune response of broiler chicks. Four hundred and eighty days-old unsexed Arbor-acres broiler chicks were randomly distributed between 48 battery pens. Four dietary inclusion of BA (0-2 or 3 g kg-1) on different (starting, growing and finishing) periods was tested. There was no significant difference in Body Weight (BW), Body Weight Gain (BWG), Feed Intake (FI), Feed Conversion Ratio (FCR) and mortality among treatments (p>0.05). Chicks fed diets included 2 g BA kg-1 showed higher BWG during 0-21 days of age (p>0.05). The relative weights of breast, thighs, abdominal fat, liver, pancreases, gall bladder, spleen, bursa of fabricius, thymus and cecum to BW were not affected by experimental treatments (p>0.05). Dietary inclusion of BA significantly increased the relative weight of intestine segments as a percentage of body weight (p<0.05). The length of small intestine was affected by dietary inclusion of BA (p<0.05). Birds fed on diets included 3 g BA kg-1 during the whole rearing period (SGF3) presented longer small intestine as compared to the control group (p<0.05). The ileal pH as well as serum metabolites except calcium were not significantly affected by BA (p>0.05). Dietary butyric acid did not have a clear positive effect on performance of broilers reared under good hygiene conditions.
 
 
 
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