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Articles by Mehdi Toghyani
Total Records ( 2 ) for Mehdi Toghyani
  Sayed Ali Tabeidian , Mehdi Toghyani , Majid Toghyani and Ahmadreza Shahidpour
  This experiment was carried out in order to determine the nutritional value of Dried Tomato Pomace (DTP) and the impact of its incremental levels with and without enzyme supplementation on broilers growth performance and ileal protein digestibility. About 384 days old broiler chicks (Ross 308) were raised together until day 7. At 7 days of age chicks were randomly allocated to one of eight treatments with 4 replicates of 12 birds each according to factorial arrangement based on a completely randomized design. Treatments included 0, 3, 6 and 9% of DTP for starter period (7-21 days); 0, 6, 9 and 12% for grower period (21-42 days) and 0, 9, 12 and 15% for finisher period (42-49 days) with and without enzyme supplementation. Body weight gain and feed intake of chicks were recorded at the end of each period and calculated for entire experimental period. Food conversion ratio was also calculated for different periods. At 49 days of age, two male birds per replicate were slaughtered for determination of protein digestibility by chromium oxide marker. Increasing DTP in none-enzyme supplemented treatments resulted in a significant reduction of daily weight gain (p<0.05). Birds fed DTP added diets had a marked (p<0.05) higher daily feed intake at 21-42 days period but enzyme supplementation reduced feed intake. The overall FCR of the experiment was significantly influenced by increasing the inclusion rate of DTP, so that chicks in control group exhibited the most efficient (p<0.05) FCR. Enzyme supplementation improved FCR in different periods compared to none-supplemented groups. Treatments failed to have any statistical (p>0.05) impact on carcass characteristics. There was no deleterious impact of experimental diets observed on ileal protein digestibility. The obtained results suggest that DTP along with enzyme supplementation could be incorporated in broilers diet up to 3, 6 and 9% for starter, grower and finisher periods, respectively without any adverse effect on performance and carcass characteristics.
  Mohammad Mohammadrezaei , Majid Toghyani , Abbasali Gheisari and Mehdi Toghyani
  Fast growth rate is one of the main characteristics of broiler chicks which emanate from their high appetite. Probably it is right to say that broilers appetite depends on energy concentration of the diet but the optimum energy concentration of the diet is still highly disputable. Therefore taking into the account chick's real energy requirements, considering physiological and environmental changes relative to the values exhibited in chick's requirements tables seems to be a viable strategy for optimizing the production costs. Poultry nutritionists have been trying to make an accurate estimation of bird's energy requirements using statistical models. Energy models estimate energy considering different influential factors on bird's energy requirements. But since these estimative models express energy requirements as kcal day-1, it seems essential to know the amount of chick daily feed intake in different stages of growth which can help to formulate diets with optimum energy levels. Also, FI models can be applied in quantitative and qualitative feed restriction programs in order to assign optimum feed allocation. Considering the importance of an accurate estimation of birds daily feed intake and its impact on making these estimative models more practical, this study aimed at using four quadric regression models estimating daily feed intake relative to chick's daily body weight according to the data provided by Ross 308, Cobb 500, Arbor Acres and Lohmannn performance tables. The results led to the definition of four quadric regression models with a high coefficient of determination (R2). Therefore, it can be concluded that there is a high correlation between daily feed intake and daily body weight changes in the foregoing strains of broiler chicks.
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