Composition of Metabolic Energy Value and Amino Acid Digestibility of Wheat, Wheat Screening and Barley Between Ileum and Faces of Broiler Chicken

Abstract

A broiler chick bioassay was carried out with forty eight -day-old Arian-broiler chickens to study the e ect of site sampling on metabolizable energy (ME) and amino acid digestibility. The test diet contained corn and soybean meal as the major ingredients. Three next treatments were formulated to contain barley, wheat and wheat screening as the test ingredients at a level of in the test diet. Chromic oxide was included in all diets as an indigestible marker. Apparent metabolizable energy (AME) and nitrogen-corrected apparent metabolizable energy (AMEn) based on excreta were significantly higher ( . ) than ileal AME and AMEn in barley. With the exception of histidine, digestibilities of amino acids based on excreta were numerically higher than the ileal value. Significant di erences between ileal and excreta-based digestibility of aspartic acid, arginine, threonine, lysine, valine and methionine indicating on a net catabolism of these amino acids in the large intestine. The current study suggests that determination of amino acid digestibility and metabolizable energy based on excreta collection will overestimate amino acid and energy availabilities in all test ingredients.: amino acids digestibility, energy value, excreta, ileal also appeared that microbial activity in the hind gut of broiler chickens is an important factor on catabolism and Cereal grains have been planted as specially crops in anabolism of amino acids (Kadim ). On the many years for human consumption, consequently considother hand di erences between amino acid digestibility in erable amounts of cereal grains and their by-products are ileum and excreta could be related to ingredient quality available for animal feeding and production. Therefore, and quantity. For example low quality diet may leads to the nutritional value of these products should be asundigested amino acids and consequently associated by certained for livestock. The formulation poultry diet large di erences between ileal and excreta digestibility. relies on matching nutrient requirements with composiTherefore this study was designed to compare ileal and tion of dietary ingredients with attention to nutrient availexcreta digestibility of amino acids in barley, wheat and ability. All diet components are important in formulation wheat screening in Iran conditions. of poultry diets but critical attention should be made to the dietary amino acids because the control of protein status and digestible amino acids have been shown to increase weight gain, feed intake and improve body comIn the present study, the physical status of wheat screenposition in broilers (Fernandez ; Rostagno ing was tested by wild seed mixer (Local-traditional in-; Taherkhani ). Finally, diets forstrument). Nitrogen-corrected apparent metabolizable mulated on a digestible amino acid basis o er economic energy was determined according to the method of benefits (Rostagno ). It is suggested that Newkirk ( ) using male chicken raised to days analysis of ileal contents rather than excreta may be a of age. After days, ...

Historical flaws in bioassays used to generate metabolizable energy values for poultry feed formulation: a critical review

“…Overall, such errors occurred in the bioassays to measure ME values of wheat (Saki et al, 2009 ), barley (Saki et al, 2009 ), full fat sunflower seed (Salari et al, 2009 ), sunflower meal (Moghaddam et al, 2012 ), Brassica meals (Newkirk et al, 1997 ), and canola meal (Woyengo et al, 2010 ; Toghyani et al, 2014 ). In contrast, some authors realized that basal diet inclusion rate (P bd ) does not equal to 1–P ti and they used appropriate equations with accurate P bd applied in the calculations as stated (Bartov, 1996 ; Rodriguez et al, 2005 ; Mandal et al, 2006 ; Adeola and Ileleji, 2009 ; Cozannet et al, 2010 ).…”