Amino acid availability in ruminants of cereals and cereal co‐products

BACKGROUND: Microbial corrected in situ estimates of the ruminal undegraded fraction (RU) and intestinal effective digestibility (IED) of amino acids (AA), except tryptophan, of rye, wheat and corn grains, wheat bran, wheat and barley distilled dried grains and corn gluten feed were measured on thre...

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Published in:Journal of the science of food and agriculture 2014-09, Vol.94 (12), p.2448-2455
Main Authors: González, Javier, Arroyo, José M, Guevara‐González, Jésus Alberto, Mouhbi, Rabiaa, Piquer, Olga, Moya, Vicente Javier
Format: Article
Language:English
Subjects:
Amino acids
Amino Acids - metabolism
Animal Feed
Animals
barley
Biological Availability
Corn
corn gluten
digestibility
Digestion
Duodenum
Edible Grain - chemistry
Estimates
Feeds
Food contamination & poisoning
Gluten
Grains
intestinal digestibility
microbial contamination
Microorganisms
protein value
rumen
Rumen - metabolism
Rumen - microbiology
ruminal degradability
Ruminants - metabolism
Ruminants - microbiology
rye
Sheep
wethers
Wheat
wheat bran
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Summary:BACKGROUND: Microbial corrected in situ estimates of the ruminal undegraded fraction (RU) and intestinal effective digestibility (IED) of amino acids (AA), except tryptophan, of rye, wheat and corn grains, wheat bran, wheat and barley distilled dried grains and corn gluten feed were measured on three rumen‐ and duodenum‐cannulated wethers using ¹⁵N‐labelling techniques and considering ruminal rates of particle comminution and outflow. RESULTS: The lack of microbial correction led to overestimations of the intestinal digested fraction that rose with the increase in ruminal degradability. Thus these overestimations varied widely among feeds (from 4.3 to 32.1% for total analysed AA) and among AA. Digestion led to large changes in the AA supply that were greater in the rumen than in the intestine. The impact of these changes on the protein value is conditioned by the magnitude of the undegraded protein fraction. CONCLUSION: Microbial contamination taking place in the rumen and changes in the AA supply with digestion should be considered to attain accurate estimates of AA digestion. Globally, digestion improved the AA supply in rye, wheat and wheat distilled dried grain and decreased it in corn and corn gluten feed by reducing the supply of valine and basic AA, especially lysine. © 2014 Society of Chemical Industry
ISSN:0022-5142
1097-0010
DOI:10.1002/jsfa.6579