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Effects of the comminution rate and microbial contamination of particles in the rumen on in situ estimates of protein and amino acid digestion of expeller palm kernel and rapeseed meal
Author(s) -
González Javier,
Arroyo José M,
Mouhbi Rabiaa,
GuevaraGonzález Jesús A,
Moya Vicente J,
Piquer Olga
Publication year - 2014
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6406
Subject(s) - digestion (alchemy) , rumen , food science , rapeseed , meal , palm kernel , dry matter , chemistry , biology , zoology , fermentation , palm oil , chromatography
BACKGROUND Microbial corrected effective in situ estimates of ruminal undegraded fraction ( RU ) and intestinal effective digestibility ( IED ) of dry matter ( DM ), crude protein ( CP ) and amino acids ( AA ) of expeller palm kernel ( EPK ) and rapeseed meal ( RSM ) were measured on three rumen‐ and duodenum‐cannulated wethers using 15 N labelling techniques and considering ruminal rates of comminution ( k c ) and outflow ( k p ) of particles .RESULTS The lack of k c and microbial correction overestimated the RU of DM by 4.91% ( EPK ) and 9.88% ( RSM ). The lack of this correction also overestimated in both feeds the RU of CP , individual and total ( TAA ) AA as well as the IED of DM , CP , TAA and most AA . RU estimates were higher for CP than for TAA , but the opposite was observed for IED . The intestinal digested fraction was higher for CP than for TAA : 17.4% ( EPK ) and 13.8% ( RSM ). Digestion led to large changes in the essential AA profile in both feeds .CONCLUSION The lack of k c and microbial correction as well as CP ‐based results leads to considerable overestimations in the protein use of both feeds. Digestion aggravates the lysine deficiency of EPK but has global positive effects in the absorbed profile of RSM . © 2013 Society of Chemical Industry