Mostafa Lotfy; farid shariatmadari; Hamed Ahmadi; Mohsen Sharafi
Volume 21, Issue 2 , July 2019, , Pages 223-232
Abstract
The purpose of this study was to develop multiple linear regression (MLR) model to predict the nitrogen-corrected true metabolizable energy (TMEn) value of wheat bran. The amount of crude fat, ash, crude protein, crude fiber (all used as % of DM) and TMEn (Kcal/kg DM) were measured in 25 wheat bran samples ...
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The purpose of this study was to develop multiple linear regression (MLR) model to predict the nitrogen-corrected true metabolizable energy (TMEn) value of wheat bran. The amount of crude fat, ash, crude protein, crude fiber (all used as % of DM) and TMEn (Kcal/kg DM) were measured in 25 wheat bran samples with 4 replicates. The force-fed method has been used to estimate TMEn and excreta were collected for 48 h. There were significant (P < 0.001) differences in chemical composition and TMEn of wheat bran samples. The average crude fat, ash, crude protein, crude fiber and TMEn content of samples was determined to be 4.80, 5.68, 16.23, 8.60 (all used as % of DM) and 2062 (Kcal/kg DM), respectively. The calculated MLR model to predict the TMEn value (Kcal/kg) based on chemical composition (% of DM) was obtained as follows: TMEn = 2364 + (19×crude protein) + (46.1×crude fat) – (63×crude fiber) – (51.1×ash). The R2 value revealed that developed model could accurately predict the TMEn of wheat bran samples (R2=0.82). Crude fat and crude protein had a positive effect on TMEn, while ash and crude fiber had a negative impact on TMEn. The sensitivity analysis on the model indicated that dietary crude fiber (%) is the most important variable in the TMEn, followed by dietary ash, crude fat and crude protein. The results suggest that the MLR model may be used to accurately estimate the TMEn value of wheat bran from its corresponding chemical composition.
Fahima Daneshyar; S. Mohammad Hosseini; Akbar Yaghobfar
Volume 21, Issue 2 , July 2019, , Pages 233-246
Abstract
In order to determine the effect of non-starch polysaccarides on performance, energy and protein efficiencies and carcass characteristics of broiler chicks, an experiment was conducted in three periods of starter, grower and finisher period, using 420 one-day old Ross 308 broiler chicks from both sexes ...
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In order to determine the effect of non-starch polysaccarides on performance, energy and protein efficiencies and carcass characteristics of broiler chicks, an experiment was conducted in three periods of starter, grower and finisher period, using 420 one-day old Ross 308 broiler chicks from both sexes in a completely randomized design with seven treatments, six replicates and 10 chicks per replicate. The experimental treatments were basal diet, diets containing 0.10 and 0.20 percent of Saccharomyces cerevisiae yeast, diets containing 5 and 10 percent of wheat bran, diets containing three and six percent of soybean hull. The results of the experiment showed that the control treatment had the lowest feed intake during the whole period of breeding (P<0.05). The highest feed intake was related to 10 percent wheat bran and levels of 3 and 6 percent soybean hull (P<0.05). Treatments containing 3 percent soybean hull showed the highest daily weight gain (P<0.05) during the whole experiment. There is no statistical difference for the feed conversion ratio during the whole trial period. The highest relative energy efficiency related to yeast levels were compared to treatments containing wheat bran and soybean hull (P<0.05). The lowest relative energy and protein efficiency was related to 10 percent wheat bran compared to control treatment (P <0.05). The results of the experiment showed that the use of two tenths of yeast, 10 percent wheat bran and six percent soybean hull in the diet of broiler chickens is recommended.