Nutritional evaluation of three local barley varieties and the impact of dietary enzyme on their apparent metabolizable energy

Two experiments were conducted to determine the true metabolizable energy corrected to zero nitrogen balance (TMEn) and true amino acid availability (TAAA) of three local barley varieties, two-row Litani (L,), two-row Pamir--/ (P,), and six-row Rihan-*- (R0) and to study the effect of enzyme supplementation on their apparent metabolizable energy corrected to zero nitrogen balance (AMEn). Forty grams of glucose, corn, or barley variety grains was precision intubated to eight individually caged Babcock B -2* roosters. The TMEn of L,, P,, and R0 (-,,., -.+3, and -,/- kcal/kg, on dry matter basis (DM), respectively) was lower than that of corn (P*.*/). All the TAAA values in P, and that of methionine, cystine, lysine, threonine, proline, and valine in L, and R0 were comparable with that of corn. Again, compared to corn, all other TAAA values in L, and R0 were significantly lower, except for serine, glutamic acid, and isoleucine in R0. In the AMEn experiment, a reference diet containing // glucose and diets containing /* corn or L,, P,, and R0 at the expense of glucose, supplemented with either * or *.+ enzyme, were each fed in . replicates (cages) to . birds/cage for . d, during which total excreta were collected at .2 and 30 h. Enzyme supplementation resulted in an AMEn improvement of ..--, ++./, and +1., for L,, P,, and R0, respectively with an average AMEn of -,.- kcal/kg DM. In conclusion, TAAA in P, was similar to corn whereas that of some amino acids such as arginine and leucine were lower in L, and R0. Enzyme supplementation to barley diets resulted in an average AMEn improvement of ++. The current .ndings can assist and encourage poultry producers in formulating least cost rations containing local barley varieties

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Product / service:	Carbohydrases and Proteases
Publication date:	01/02/2006
Species:	Poultry
Authors:	Barbour GW, Hruby M, Farran MT, Nada NU, Ali HD, Machlab HH, Uwayjan MG, Ashkarian VM, Darwish AH, Vahe M
Doctype:	Publications & Citations
Publication / conference:	Animal Feed Science & Technology, volume 129
Regions and countries:	Global
Keywords:	amen, amino, acid, availability, acids, apparent, metabolizable, energy, arginine, barley, diets, cages, corn, cost, cystine, dan, diet, dietary, enzyme, dm, dry, matter, supplementation, evaluation, excreta, glucose, glutamic, grain, grains, isoleucine, l, leucine, lysine, methionine, nitrogen, balance, p, poultry, proline, ration, rations, rooster, serine, threonine, tmen, true, valine, varieties, variety
Production challenge(s):	Gut health
Diets:	Barley, Wheat and barley & high fibre by-products
Brands:	Avizyme® 1200, Axtra® AB, Avicheck
Resource ref:	8953
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Nutritional evaluation of three local barley varieties and the impact of dietary enzyme on their apparent metabolizable energy

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