جستجوی مقالات مرتبط با کلیدواژه « true metabolizable energy » در نشریات گروه « علوم دام »

An experiment was conducted to determining chemical composition, true metabolizable energy corrected to zero nitrogen balance (TMEn) of broiler finisher diets and establishment of prediction equation of TMEn value. At first, twelve broiler finisher diet samples were provided from twelve poultry feed plants and subjected to chemical composition analysis by standard laboratory methods. Average values of dry matter, crude protein, crude fat, crude ash, crude fiber, calcium and phosphorus were obtained 91.52, 18.64, 2.71, 6.85, 3.21, 0.80 and 0.36 percent, respectively. Sibbald’s method was used for determination of TMEn values and dry matter metabolizability of feeds using 54 d male Ross -308 broiler chickens. TMEn values showed significant differences among broiler finisher diet samples (P< 0.01). The average value of TMEn in broiler finisher diets was 3234 Kcal/kg and varied from 3012 to 3430 Kcal/kg. Values of TMEn/GE ratio in diet samples varied from 0.65 to 0.74 and showed significant differences (P< 0.01). Average value of dry matter metabolizability was 55.4 percent and showed significant differences among the diets (P< 0.01). The diets which had higher crude fiber content, showed lower dry matter metabolizability. TMEn values of broiler finisher diets showed a significant high negative correlation coefficient with crude ash percent (r=-0.80, P=0.01). Regression analysis showed that TMEn content of broiler finisher diets could be predict from ash, crude protein and phosphorous content of diets with coefficient determination equal to 0.69.

The aim of this experiment was to determine non-starch polysaccharides and true metabolizable energy of five wheat varieties (Alvand، Zarrin، Sabalan، Sardari and Azar2). Non-starch polysaccharides of wheat varieties were measured with Englyst method by spectrophotometer. Nitrogen corrected true metabolizable energy of five wheat varieties was also determined with Sibbald precision feeding method. A completely randomized design with 24 roosters (Ross 308) at the age of 5 month was used in this experiment. The result of NSP content showed the total NSP، Insoluble NSP and soluble NSP varied of 9. 44 to 11. 96 %، 7. 10 to 9. 40 % and 1. 95 to 3. 15 % DM، respectively. The highest total NSP value (11. 96%) and Insoluble NSP value (9. 40%) were found in Aza2 variety، and the highest Soluble NSP value (3. 15%) was found in Alvand one. The lowest total NSP (9. 44%) and soluble NSP (1. 95%) values were resulted of Sabalan variety، and the lowest Insoluble NSP (6. 94%) was resulted of Zarrin variety. The TMEn content of wheat varieties varied from 3562. 32 Kcal/kg (Sabalan variety) to 3741. 64 Kcal/kg (Zarrin variety)، and TMEn content showed significantly differences as wheat varieties (P<0. 01). This experiment demonstrated that the metabolizable energy content of East Azerbaijan wheat varieties have a high variation and relative to method of cultivation.

The aim of this experiment was to determine the chemical composition and true metabolizable energy content of poultry by-product and evaluation the effect of East Azerbaijan poultry by-product meal on broiler performance, carcass characteristics and blood parameters. Chemical composition of poultry by-product meal was determined with standard methods and nitrogen corrected true metabolizable energy (TMEn) of poultry by-product meal was determined with precision method. To evaluate broiler growth performance, a total of 3000 as-hatched broiler chicks (Ross 308) from 15 to 49 Days of age, was assigned to 6 treatments with 5 replicates using a completely randomized design. Dietary treatments were 0 (as control), 2, 4, 6, 8 and 10% included levels of poultry by-product in the diets. The average of TMEn and crude protein content of poultry by-product meal sample were 3680 kcal/kg and 54.81 %, respectively. The result of this experiment showed that the all performance parameters were significantly affected by the level of poultry by-product meal (P< 0.01). The broiler chickens fed with 8 % of poultry by-product meal had the highest weight gain, relative empty body, breast and thigh weights and the chickens fed with the control diet had the lowest performance (P< 0.01). The best feed convention ratio was observed in the chickens fed with 2 % of poultry by-product meal in the diet. Regarding blood parameters, the results showed that all bloody parameters (LDL, HDL, triglyceride and total cholesterol) were in the normal range. This experiment showed that the poultry by product meal could be supplemented to 8% in broiler chickens diet without any harmful effects.

An experiment was conducted to predict the true metabolizable energy (TMEn) of compounded starter feeds of broiler chickens trough their chemical composition using precision-feeding method of Sibbald in male boilers. In the first، eight compounded feed samples provided from eight feed plants and their chemical composition determined in laboratory. Results of chemical composition showed that average values of dry matter، crude protein، ether extract، crude ash، crude fiber، calcium and phosphorus were 90. 47، 20. 99، 2. 79، 2. 88، 6. 69، 1. 08 and 0. 49 percent، respectively with coefficient of variation between 2. 01 to 13. 29 percent. The average value of TMEn in compounded starter feeds was also obtained 3006 Kcal/kg with variation from 2884 to 3275 Kcal/kg and differences between them were significant. The variation between metabolizability values in the compounded feeds was 0. 7 to 0. 8 percent and differences between their values were not significant. The average value of dry matter true metabolizability in starter feeds was obtained as 54 percent and those having higher crude fiber، showed lower dry matter true metabolizability. The TME and TMEn values of compounded starter feeds showed a negative correlation as 0. 38 and 0. 59 percent with crude ash of feeds، so that the feeds containing higher crude ash had lower TME and TMEn values. Regression analysis showed that we can predict the TMEn value of broiler compounded starter feeds via regression equations from crude ash، crude protein، calcium and phosphorus contents of feeds from their crude ash، crude protein، calcium and phosphorus with R2 value as 0. 67 (P=0. 002).

The objective of this study was to determine of chemical composition، true digestibility of amino acid (TDAA) and true metabolizable energy corrected to zero nitrogen balance (TMEn) of three poultry by-product meals (PBM). Three PBM were obtained from Tabriz، Mahabad and Urmia commercial slaughter plants. TMEn and TDAA of PBM samples were determined in 16 adult cecectomized broiler roosters with completely randomized design. Four roosters were assigned to each treatment and four roosters were deprived of feed throughout the experimental period to measure endogenous excretion of energy، N، and AA. The mean levels of nutrients (percentage) in the meals for CP، EE and ash were 56. 84±0. 42، 21. 57±0. 48 and 7. 62±0. 17، respectively. TMEn and TDAA were significant differences among meals (P< 0. 05) and mean of TMEn for all samples were 3528 (kcal/kg). TMEn for Tabriz sample was greatest and for Urmia sample was lowest (P< 0. 05). Mean of TDAA for Tabriz sample (81. 56%) was higher than Mahabad (67. 71%) and Urmia (66. 9%) samples (P< 0. 05). However، digestible amino acid was greatest for Tabriz sample among the PBM. The results of this study indicated that the nutritive value of Tabriz PBM was higher than that of Urmia and Mahabad meals.