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Effect of dietary nutrients on ileal endogenous losses of threonine, cysteine, methionine, lysine, leucine and protein in broiler chicks

Published online by Cambridge University Press:  14 September 2017

S. Cerrate
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
S. K. Vignale
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
R. Ekmay
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
J. England
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
C. Coon*
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
*
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Abstract

An isotope dose technique was utilized (i) to determine endogenous amino acid (AA) and protein losses and (ii) to propose adjusted values for AA requirements. The endogenous flow rate was calculated from the pool of enrichment in plasma AA, assuming similitude to enrichment of endogenous AA. In experiment 1, chicks were orally administered D4-lysine at 2% of estimated lysine intake from 16 to 24 days to find the isotopic steady state of the atom percent excess (APE) of lysine for plasma and jejunal and ileal digesta. The APE of D4-lysine in plasma, jejunal digesta and ileal digesta reached the isotopic steady state at 5.5, 3.4 and 2.0 days, respectively, by using the broken-line model. It was assumed that the isotopic steady state at 5 days identified for D4-lysine is also representative for the 15N-labeled AA. In experiment 2, chicks were fed diets from 1 to 21 days with increasing levels of fat (6%, 8%, 12%, 13% extract ether), protein (26%, 28.5%, 31% CP) or fiber (14%, 16%, 18% NDF) by adding poultry fat, soybean meal, blended animal protein or barley. Chicks were orally administered 15N-threonine, 15N-cysteine, 15N-methionine, 15N-lysine and 15N-leucine at 2% of estimated daily intake for 5 days from 17 to 21 days of age. Dietary nutrients influenced endogenous losses (EL), where dietary fat stimulated EL of lysine (P=0.06), leucine and protein (P=0.07); dietary protein enhanced EL of leucine and protein; and finally the dietary fiber increased EL of leucine. Dietary nutrients also affected apparent ileal digestibility (AID). Dietary fat increased AID of cysteine but decreased AID of lysine. Dietary protein reduced AID of protein, threonine, lysine and leucine, and similarly dietary fiber decreased AID of protein, threonine, methionine, lysine and leucine. In contrast, dietary fat or protein did not affect real ileal digestibility (RID) of protein and AA except threonine and leucine. The dietary fiber reduced the RID of protein, threonine and leucine. This indicate that variations of some endogenous AA and protein losses due to dietary nutrients almost eliminates the effects of RID, and thus the EL coming from the body should be utilized to adjust the AA requirement instead of changing the true digestible nutrients of ingredients. The present data suggest that 5 days’ feeding labeled AA was enough to reach the isotopic steady state and AA requirements should be adjusted when additional dietary protein, fat or fiber is fed.

Type
Research Article
Copyright
© The Animal Consortium 2017 

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Footnotes

a

Present address: Aviagen Incorporated, Huntsville, AL, USA.

b

Present address: Kemin Agrifoods, Des Moines, IA, USA.

c

Present address: Dow Agro Sciences LLC, Indianapolis, IN, USA.

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