the role of added feed enzymes in promoting gut health in
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June, 2014
L.F. ROMERO
The role of added feed enzymes in promoting gut health in poultryEUROPEAN POULTRY CONFERENCEPRE-CONFERENCE TECHNICAL SEMINAR
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Outline
The links between enzymes and gut health
Production of pre-biotics in-situ
Digestion of feed substrates and its relationship with gut health
Summary and implications
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The links between enzymes and gut health
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Mechanisms of action of carbohydrases and proteases in broiler diets
Xylanase; endo-glucanaseReduced viscosity (Choct, 1999)
Improved access to cell contents (Cowieson, 2005)
Prebiotic effects (Fernandez et al., 2000)
Possible reduction of endogenous inputs(Satchithanandam et al., 1990)
Feed intake
Digestion
Feces
Endogenousinputs
Fermentation
Absorption
Production
a.a., starch, fat
a.a., NE
AX
XAP
ProteaseHydrolysis of dietary protein and increased protein solubility (Caine et al., 1998)
Disruption of protein-starch interactions in corn (Mc Allister et al., 1993; Belles et al., 2000 )
Disruption of protein-fiber interactions (Colombatto et al, 2009)
AmylaseDown regulation of pancreatic amylase (Jiang et al., 2008) Augmentation of pancreatic amylase activity in young animals (Gracia et al., 2003)
Improvement of digestion of resistant starch in corn and corn by products (Sharma et al., 2010) P
X SCFA
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Bio-efficacy of feed enzymes is affected by complex interactions in the gut system
Bio-efficacy of feed
enzymes
Substrate matrix
Interactions with gut biome
Interactions with gut mucosa
Dose
Biochemical profile
Other additives/ enzymes
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Gut health
Maintenance of optimal intestinal structure and function to enable the expression of the full genetic potential for growth and yield and to fully utilize the dietary nutrients (modified from Hoerr, 2010)
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(taken from Bischoff, 2011)
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Feed enzymes: phytase, xylanase, endo-glucanase,
amylase, protease
Increased growth and
feed efficiency
More nutrients digested
More nutrients
absorbed and metabolizedReduced
endogenous inputs for digestion
Reduced populations
of pathogenic bacteria
Reduced endogenous
inputs for immunity
Less nutrients
available for pathogens
Improved gut integrity
Possible links between feed enzymes and gut health
Production of prebiotics in-
situ
Production of SCFA
Changes on appetite and
passage rate?
Changes on organs
development and function
Reduced viscosity due
to soluble NSPs
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7/4/2014 Williams, 2005
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Production of pre-biotics in-situ
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Arabinoxylans from cereals are structurally complex
Diferulicacids/ xylose units
Arabinose/ xylose
Wheat 1/217Corn 1/41
(Bunzel et al., 2001)
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Digestion of fiber was affected by proteases in a rumen model (Colombatto and Beauchemin, 2009)
Serine protease tested in digestion of alfalfa in rumen batch model
Protease increased in vitro disappearance of DM, NDF, hemicellulose, and protein
Protease may have “acted by removing structural proteins in the cell wall, allowing ruminal microbes to gain faster access to digestible substrates”
From Colombatto and Beauchemin, 2009
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Solubilisation of pentosans and protein from corn-DDGS due to protease on top of xylanase are correlated
7/4/2014Pedersen et al., unpublished
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Carbohydrases had an additive effect on arabinose and xylose flow on top of proteases
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aa
a
a
abab
a
a
ccd
bc
b
cd
bc
b
bcbc
ab
a
cdde
c
b
de
c
b
0
0.5
1
1.5
2
2.5
3
3.5
Arabinose Xylose Galactose Glucose
Tota
l tra
ct N
SP fl
ow(g
/100
g DM
)
Negative Control Protease 1, 5000 U/kg Protease 1, 10000 U/kg
Protease 2, 10000 U/kg XAP 50%, 2500 protease U/kg XAP 100%, 5000 protease U/kg
XAP 200%, 10000 protease U/kg
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Prebiotic effects of cereal derived arabino-xylo-oligosaccharides have been well studied in humans and rats
7/4/2014 Broekaert et al., 2011
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Health-related effects of cereal derived AXOS in humans
Increased faecal acetate, propionate and butyrate (Grasten et al., 2003)
Normalization of stool moisture and consistency (Okazaki et al., 1990)
Reduced initial lesions of colon cancer development in rats (Hsu et al., 2004)
Attenuation of increases in
• serum cholesterol, triglycerides under adverse dietary conditions (Lopez et al., 1999)
• glucose levels in diabetes II subjects (Liu et al., 2004)
Feruloylated AXOS have anti-oxidant properties (Ou et al., 2007)
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Effects of cereal derived AXOS in chickens
Increased caecal Bifidobacteria levels (Courtin et al., 2008a, 2008b)Reduction of Salmonella in caeca, cloaca and spleen (Eeckhaut et al., 2008)
7/4/2014Eeckhaut et al., 2008
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Increased production of SCFA due to xylanases have been reported
Choct et al. reported increased SCFA production in the caeca of broilers fed wheat based diets supplemented with xylanase from Trichodermaressei and protease from B. subtilis
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Choct et al. 1999
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Not all xylanases have the same effects on production of SCFAs
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Choct et al. 2004
Factors affecting fibre degradation and SCFA production in vivo:
SpecificitySmall versus large intestine activityPepsin resistanceAge of birdsDietHealth status
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Positive effects of xylanases have been reported in chickens challenged with pathogens
Necrotic enteritis (C. perfringens)• Reduced endotoxin concentrations in plasma, and apoptosis index in ileum
post-challenge (Liu, 2012)• Increased expression of nutrient transporters (SGLT1, PepT1, and L-FABP) in
the jejunum of challenged broilers (Guo et al., 2014)
Salmonella• Reduced horizontal transmission with S. Heidelberg (Amerah et al., 2012)
Campylobacter• Reduced counts in caeca of chickens fed wheat based diets (Fernandez et al.,
2000)
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Production of prebiotics in-situ
Cereal arabinoxylo-oligosaccharides have been attributed prebiotic effects in humans and chickens
Xylanases can solubilise arabinoxylans and produce oligosaccharides in the bird’s gastro intestinal tract, with increased production of SCFAs
Prebiotic effects of xylanase depend on enzyme characteristics and other factors affecting gut microbial communities
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Digestion of feed substrates and its relationship with gut health
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Intra-epithelial lymphocytes (IEL) in chickens are natural killer (NK), B and T cells (Klasing, 2005).
Mucin (slime)
ColonCecaIleumJejunumDuodenumProventriculusEsophagus
Intra-epithelial lymphocytes (cells/mm)Bacteria (log /g luminal contents)
Small intestine balances conflicting objectives: absorbing nutrients and defending host from pathogens
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Proliferation of pathogenic C. perfringens was influenced by cereal type only in digested samples (in-vitro simulation)
7/4/2014 Annette et al., 2002
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High undigested protein levels might be associated to increased susceptibility to Necrotic Enteritis
7/4/2014 Drew et al., 2004
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In 13 broiler trials, ileal digestibility of starch was increased by Xylanase + Amylase and Protease enzymes
94,6%
96,8% 97,0%
92 %
94 %
96 %
98 %
Appa
rent
ilea
l dig
estib
ility
of
sta
rch
(%)
NC NC+XA NC+XAP
a a
b
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In 13 broiler trials, ileal digestibility of crude protein was increased by Xylanase + Amylase and Protease enzymes
82,5%
84,2%
85,6%
80 %
82 %
84 %
86 %
Appa
rent
ilea
l dig
estib
ility
of
pro
tein
(%)
NC NC+XA NC+XAP
b
a
c
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Mal-absorption plays a significant role in economic losses due to sub-clinical enteric disease
281 311 308 304 315
38 57 94 122 130305 191 110 49 -0,9
0100200300400500600700800
0 0,5 1 1,5 2
Ener
gy a
lloca
tion
(kca
l/bird
/day
)
Lesion scores (0-4)Maintenance cost Added energy lost in excretaRetained energy MEn intake
Teeter et al. 2011; Broussard et al., 2008
Energy partitioning of 42-48 d old broilers challenged with oocysts of three Eimeria species
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Bacillus DFMs and enzymes in a challenge situation
Cobb x Cobb males
8 pens/trm; 50 birds/pen
Necrotic Enteritis challenge model, mild mortality (~10-15%)Coccivac B at 0 dReused litterA field strain of C. Perfringens in feed at 20, 21 and 22 d
Mortality, lesion scores, performance
Corn/SBM/DDGS based diets, 500 FTU/kg of E. coli phytase in the background
Southern Research Centre, GA; Mathis et al., 2013
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Treatments
1. Unchallenged Control
2. Challenged Control (CC)
3. CC + A = Amylase from B. licheniformis (200 U/kg)
4. CC + P = Protease from B. subtilis (5,000 U/kg)
5. CC + XAP = AP + xylanase from T. ressei (2,000 U/kg)
6. CC + DFM (3 strains Bacillus subtilis; 7.5 x 104 CFU/g)
7. CC + DFM + A
8. CC + DFM + P
9. CC + DFM + XAP
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30
42-day body weight gain was affected by DFMs and enzymes
1988
1790 18141871 19031935 1945 1964
2016
1600
1700
1800
1900
2000
2100
Unchallenged control
Challenged control
CC + Amylase CC + Protease CC + XAP
BW
gai
n 0-
42 d
(g/b
ird)
No DFM + DFM
aabc
dd
abc
cd
ab
bc
a
CC = Challenged Control; birds were challenged with C. perfringens at 20, 21 and 22 dDFM is a combination of 3 Bacillus subtilis strains; XAP is xylanase, amylase, and protease a, b: means without a common letter differ at P<0.05
P<0.001
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Bacillus DFM and XAP reduced 42-day FCR to the level of the unchallenged control
1,753
1,967 1,9481,884 1,869
1,815 1,807 1,8091,756
1,60
1,70
1,80
1,90
2,00
2,10
Unchallenged control
Challenged control
CC + Amylase CC + Protease CC + XAP
FCR
0-4
2 d
(g/g
)
No DFM + DFM
d
c
aa
c
b
c
b
d
CC = Challenged Control; birds were challenged with C. perfringens at 20, 21 and 22 dDFM is a combination of 3 Bacillus subtilis strains; XAP is xylanase, amylase, and protease a, b: means without a common letter differ at P<0.05
P<0.001
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Mortality related to NE
0 %
11 %10 %
9 %7 %
3 % 4 %3 % 4 %
0 %
2 %
4 %
6 %
8 %
10 %
12 %
Unchallenged control
Challenged control
CC + Amylase CC + Protease CC + XAP
NE
rela
ted
mor
talit
y (%
)
No DFM + DFM
CC = Challenged Control; birds were challenged with C. perfringens at 20, 21 and 22 dDFM is a combination of 3 Bacillus subtilis strains; XAP is xylanase, amylase, and protease a, b: means without a common letter differ at P<0.05
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Digestion of feed substrates and its relationship with gut health
Increased absorption of nutrients in the small intestine, in particular readily available N and C sources, due to enzymes can contribute to maintain gut health in chickens
Conversely, clinical episodes of enteric disease causing mal absorption can reduce the potential of exogenous enzymes to increase nutrient utilization
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Summary and implications
Exogenous enzymes targeting feed arabinoxylans have the capacity to create prebiotics in situ• Increase SCFA production• Reduce negative effects of Necrotic enteritis• Reduce Salmonella and Campylobacter prevalence
Reduction of undigested substrates in the small intestine can play a role in reducing nutrient availability for the growth of pathogens
Exogenous enzymes are only one of the various tools to manage intestinal health in commercial poultry
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