University of Florida, Gainesville, FL Eight ruminally cannulated heifers were used in a replicated 4 x 4 Latin square to determine the effects of replacing dry rolled corn with corn bran or a combination of corn bran and corn steep, on diet digestibility and rumen environment. Heifers received diets including 0% bran, 30% bran, 30% bran/15% steep and 45% bran/ 15% steep. Byproduct diets were effective in reducing acidosis and had lower dry matter and organic matter digestibilities than the control diet, regardless of steep inclusion. Fiber digestion and microbial efficiency may have been promoted with the inclusion of corn bran and steep in the diet. Feeding a diet containing corn bran and steep may be valuable for improving nutrient utilization in the rumen

Erickson, Galen E.

Klopfenstein, Terry J.

Loy, Tim W.

Sayer, Kristi M.

English

UNL | Libraries

University of Nebraska - Lincoln 
DigitalCommons@University of Nebraska - Lincoln 
Nebraska Beef Cattle Reports Animal Science Department 
January 2005 
Effect of Corn Bran and Corn Steep Inclusion in Finishing Diets on 
Diet Digestibility and Fiber Disappearance 
Kristi M. Sayer 
University of Nebraska-Lincoln 
Galen E. Erickson 
University of Nebraska-Lincoln, gerickson4@unl.edu 
Terry J. Klopfenstein 
University of Nebraska-Lincoln, tklopfenstein1@unl.edu 
Tim W. Loy 
University of Nebraska-Lincoln 
Follow this and additional works at: https://digitalcommons.unl.edu/animalscinbcr 
 Part of the Animal Sciences Commons 
Sayer, Kristi M.; Erickson, Galen E.; Klopfenstein, Terry J.; and Loy, Tim W., "Effect of Corn Bran and Corn 
Steep Inclusion in Finishing Diets on Diet Digestibility and Fiber Disappearance" (2005). Nebraska Beef 
Cattle Reports. 176. 
https://digitalcommons.unl.edu/animalscinbcr/176 
This Article is brought to you for free and open access by the Animal Science Department at 
DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Nebraska Beef Cattle 
Reports by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. 
Page 39 — 2005 Nebraska Beef Report
Effect of Corn Bran and Corn Steep Inclusion
in Finishing Diets on Diet Digestibility and
Fiber Disappearance
(Continued on next page)
Kristi M. Sayer
Galen E. Erickson
Terry J. Klopfenstein
Tim W. Loy1
Summary
Eight ruminally cannulated heifers
were used in a replicated 4 x 4 Latin
square to determine the effects of
replacing dry rolled corn with corn
bran or a combination of corn bran and
corn steep, on diet digestibility and
rumen environment. Heifers received
diets including 0% bran, 30% bran,
30% bran/15% steep and 45% bran/
15% steep. Byproduct diets were effec-
tive in reducing acidosis and had
lower dry matter and organic matter
digestibilities than the control diet,
regardless of steep inclusion. Fiber
digestion and microbial efficiency may
have been promoted with the inclusion
of corn bran and steep in the diet. Feed-
ing a diet containing corn bran and
steep may be valuable for improving
nutrient utilization in the rumen.
Introduction
Providing options to decrease
ammonia emissions is essential for
future progress of the feedlot indus-
try. Feeding corn bran, which is a
source of highly digestible fiber, is
an effective means of reducing N
losses from the feedlot pen surface.
When 30% bran replaced dry rolled
corn (DRC), N losses were reduced
by 38% in the winter months (2003
Nebraska Beef Report, pp 54-58). The
reduction in N lost was achieved by
reducing diet digestibility, increas-
ing fecal N output, and increasing
OM on the pen surface.
Fecal N is more stable than uri-
nary N. Increasing the amount of
fermentable carbohydrates to the
hind gut, via feeding a lower digest-
ible diet, is an effective means to
increase fecal N (1996 Nebraska Beef
Cattle Report, pp 74-77). The conse-
quence of reducing diet digestibility
is reduced feed efficiency in cattle
(2002 Nebraska Beef Cattle Report, pp
54-57; 2003 Nebraska Beef Report, pp
54-58).
Corn steep is a by-product of the
wet corn milling industry that is a
combination of both distillers solu-
bles and steep liquor. It has a high-
er energy value than DRC (1998
Nebraska Beef Cattle Report, pp 69-
71). The objective of the following
metabolism study was to evaluate
the effect of corn bran and steep
inclusion in finishing diets on diet
digestibility and rumen environ-
ment.
Procedure
Eight ruminally cannulated
crossbred heifers were used in a
replicated 4 x 4 Latin square
design. All diets included 15% corn
silage, 5% supplement and DRC.
Treatments included a 0% corn
bran control (CON), 30% bran
(30/0), 30% bran/15% steep
(30/15), and 45% bran/15% steep
(45/15), with by-products replacing
DRC and molasses (Table 1). These
diets were similar in composition to
those fed in two finishing trials
used to evaluate cattle performance
and N mass balance (2005 Nebraska
Beef Cattle Report, pp 54-56). Periods
included 16-day adaptation and
5-day collection. Chromic oxide
was used as a marker to determine
total tract digestibility, dosed 7.5 g,
twice daily through the rumen can-
nula. The chromic oxide was dosed
72 hours before the first collection
day, to ensure it was equally con-
centrated throughout the digesta.
Fecal samples were taken three
times during each collection day,
dried in a 60oC oven for 48 hours,
and composited. Intake was con-
tinuously measured similar to the
system described by Cooper et al.,
(1997 Nebraska Beef Report, pp 49).
Ruminal fluid was collected prior
to feeding and at 2, 4, 6, 8, 10 and
12 hours after feeding on each of
the 5 days during a collection
period.
An in-situ trial also was con-
ducted during the final collection
period. Corn bran and DRC were
incubated as-is at time points of 0,
12, 24, 48, and 96 hours, with corn
bran extent of 96 hours and DRC at
a 48-hour extent. Each time point
used two steers per diet and two
replications per sample, with an
empty dacron bag incubated for a
control. Both bran and DRC were
evaluated for DM disappearance
2005 Nebraska Beef Report — Page 40
rate; corn bran also was evaluated
for NDF disappearance rate within
each of the four diets. Potential
digestible fractions were calculated
by subtracting the extent hour value
from the 0 hour value. A log trans-
formation calculation was used to
calculate DM and NDF disappear-
ance rates (%/hour).
Results
Dry matter intake was similar
among all treatments, averaging 25
lb/day (P > 0.10; Table 1). By-
product diets had higher ruminal
pH (5.96) than CON (5.75), aver-
aged across all time points
(P < 0.01; Table 2). The lower rumi-
nal pH supports the concept that
feeding by-products helps mini-
mize the effects of acidosis. Acetate:
propionate ratios were 2:09, 2:25,
2:30, and 2:52 for the CON, 30/0,
30/15, and 45/15 diets, respec-
tively (P<0.05). When diets had a
higher fiber content (i.e. bran
included in the diet), acetate con-
centrations were higher and propi-
onate concentrations were lower.
Total tract DM digestibility
(Table 2) was higher in CON than
by-product diets (79% vs 73.0%,
P < 0.01), as was OM digestibility
(80.2% vs. 74.6%, P < 0.01). Steep
provided no improvement in DM or
OM digestibility of the 30/15 diet.
This is somewhat different from
previous research that evaluated
15% corn bran and 15% corn bran
plus 15% steep (15/15). Scott et al.
(1998 Nebraska Beef Report, pp 69-
71) reported the DM digestibility of
a 15% bran diet to be 80%, while the
15/15 diet was 83% digestible.
Although there was no statistical
difference in the data from Scott et
al., (1998) steep did tend to improve
total tract digestibility.
In-Situ Results
DM disappearance (%/hour) of
DRC was lower in CON diet than
by-product diets (P < 0.01; Table 3),
suggesting that because the rumen
pH was higher in the byproduct
Table 1. Composition of dietary treatments for metabolism and in situ trials (% DM
basis).
Ingredient CON 30/0 30/15 45/15
Dry Rolled Corn 75 45 35 20
Corn Silage 15 15 15 15
Corn Bran — 30 30 45
Steep — — 15 15
Molasses 5 5 — —
Dry Supplementa 5 5 5 5
Nutrient Composition (%)
CPb 13.7 13.4 14.0 14.2
Calciumc 0.70 0.70 0.70 0.70
Phosphorusc 0.32 0.26 0.47 0.44
aSupplement formulated to provide 28g/ton Rumensin® and 10 g/ton Tylan®.
bCalculated based on CP analysis of feedstuffs.
cCalculated using tabular values for ingredients.
Table 2. Effect of dietary treatment on DM intake, total tract digestibility, and ruminal
pH.
Treatmenta
Item CON 30/0 30/15 45/15 SE b F-Testc
Avg pHd 5.75g 5.95h 5.94h 5.98h 0.06 <0.01
DM Intake, lb/d 23.8 25.8 25.4 25.2 1.4 0.56
DM Digested, lb/d 18.8 19.0 18.5 18.3 1.0 0.90
DMD,%e 79.0g 73.7h 72.8h 72.6h 1.5 0.03
OM Intake, lb/d 22.1 24.0 23.6 23.4 1.3 0.56
OM Digested, lb/d 17.7 18.0 17.6 17.4 1.0 0.95
OMD,%f 80.2g 75.0h 74.4h 74.4h 1.5 0.03
aCON = dry rolled corn based diet with no by-product inclusion; 30/0 = dry rolled corn
replaced with 30% bran and 0% steep; 30/15 = dry rolled corn and molasses replaced
with 30% bran and 15% steep; 45/15 = dry rolled corn and molasses replaced with 45%
bran and 15% steep.
bStandard error of the mean.
cData were analyzed using a protected F-test where numbers represent P-value for
variation due to treatment.
dAvg pH = average pH.
eDMD = DM digestibility.
fOMD = OM digestibility.
ghMeans within row with unlike superscripts have differing values.
Table 3. Disappearance rates (%/hour) of corn bran and dry rolled corn incubated
within each dietary treatment.
Treatmenta
Item CON 30/0 30/15 45/15 SE b F-Testc
DMd (corn)d 2.36f 2.71g 2.99g 2.89g 0.22 <0.01
DMd (bran)d 0.76f 2.18g 1.70g 1.92g 0.22 <0.01
NDFd (bran)e 0.82f 1.71g 1.79g 2.08h 0.05 <0.01
aCON = dry rolled corn-based diet with no by-product inclusion; 30/0 = dry rolled corn
replaced with 30% bran and 0% steep; 30/15 = dry rolled corn and molasses replaced
with 30% bran and 15% steep; 45/15 = dry rolled corn and molasses replaced with 45%
bran and 15% steep.
bStandard error of the means.
cData were analyzed using a protected F-test where numbers represent P-value for
variation due to treatment.
dDMd = Dry matter disappearance rate calculated as%/hour.
eNDFd = NDF disappearance rate calculated as%/hour for corn bran.
fghMeans with unlike superscripts within row have differing values.
Page 41 — 2005 Nebraska Beef Report
Figure 1. Corn bran NDF disappearance (%), reported at 12, 24, 48, and 96 hours,
incubated within each dietary treatment.
100
90
80
70
60
50
40
30
20
10
0
%
 N
D
F 
D
is
ap
pe
ar
an
ce
CON
30/0
30/15
45/15
0 20 40 60 80 100
Hour
diets, the microbial population was
more efficient at digesting the DRC.
The NDF content of corn bran was
72.9%. NDF disappearance rates
(%/hour) were highest for the
45/15, similar for 30/0 and 30/15,
and lowest for CON (P < 0.01; Table
3). This suggests that when corn
bran is increased in the diet, the
microbial population has more
cellulolytic bacteria. A higher cellu-
lolytic bacteria population would
promote an increase in the acetate:
propionate ratio, as well as an
increase in ruminal fluid pH.
The percentage of NDF dis-
appearance was not different
among diets at 0, 12 and 24 hours;
however, at 48 and 96 hours (Figure
1), the NDF disappearance for bran
was lower for CON than by-
product diets (P < 0.01). Digestion
of corn bran occurred to a further
extent when bran was incubated in
30/0, 30/15, and 45/15 diets, com-
pared to incubation in the CON
diet. These data support the theory
that because of a higher ruminal
pH and an altered microbial popu-
lation, digestion of both dry rolled
corn and bran occurs to a greater
extent.
While adding steep to the diet
did not improve total tract digest-
ibility, it did improve cattle perfor-
mance (2005 Nebraska Beef Report,
pp 54-56). By-product diets are
effective in reducing acidosis, and
have lower dry matter and organic
matter digestibilities than typical
corn-based diets, regardless of steep
inclusion. Rate of corn bran
digestion and extent is greater in
by-product-based diets. Feeding
corn bran and steep in combination
is an effective means of promoting
fiber digestion, and maintaining a
healthier rumen environment.
1Kristi M. Sayer, graduate student,
Galen E. Erickson, assistant professor,
Terry J. Klopfenstein, professor, Tim W.
Loy, former research technician, Animal
Science, Lincoln.


Effect of Corn Bran and Corn Steep Inclusion in Finishing Diets on Diet Digestibility and Fiber Disappearance

DigitalCommons@University of Nebraska

University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Nebraska Beef Cattle Reports Animal Science Department January 2005 Effect of Corn Bran and Corn Steep Inclusion in Finishing Diets on Diet Digestibility and Fiber Disappearance Kristi M. Sayer University of Nebraska-Lincoln Galen E. Erickson University of Nebraska-Lincoln, gerickson4@unl.edu Terry J. Klopfenstein University of Nebraska-Lincoln, tklopfenstein1@unl.edu Tim W. Loy University of Nebraska-Lincoln Follow this and additional works at: https://digitalcommons.unl.edu/animalscinbcr  Part of the Animal Sciences Commons Sayer, Kristi M.; Erickson, Galen E.; Klopfenstein, Terry J.; and Loy, Tim W., "Effect of Corn Bran and Corn Steep Inclusion in Finishing Diets on Diet Digestibility and Fiber Disappearance" (2005). Nebraska Beef Cattle Reports. 176. https://digitalcommons.unl.edu/animalscinbcr/176 This Article is brought to you for free and open access by the Animal Science Department at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Nebraska Beef Cattle Reports by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Page 39 — 2005 Nebraska Beef ReportEffect of Corn Bran and Corn Steep Inclusionin Finishing Diets on Diet Digestibility andFiber Disappearance(Continued on next page)Kristi M. SayerGalen E. EricksonTerry J. KlopfensteinTim W. Loy1SummaryEight ruminally cannulated heiferswere used in a replicated 4 x 4 Latinsquare to determine the effects ofreplacing dry rolled corn with cornbran or a combination of corn bran andcorn steep, on diet digestibility andrumen environment. Heifers receiveddiets including 0% bran, 30% bran,30% bran/15% steep and 45% bran/15% steep. Byproduct diets were effec-tive in reducing acidosis and hadlower dry matter and organic matterdigestibilities than the control diet,regardless of steep inclusion. Fiberdigestion and microbial efficiency mayhave been promoted with the inclusionof corn bran and steep in the diet. Feed-ing a diet containing corn bran andsteep may be valuable for improvingnutrient utilization in the rumen.IntroductionProviding options to decreaseammonia emissions is essential forfuture progress of the feedlot indus-try. Feeding corn bran, which is asource of highly digestible fiber, isan effective means of reducing Nlosses from the feedlot pen surface.When 30% bran replaced dry rolledcorn (DRC), N losses were reducedby 38% in the winter months (2003Nebraska Beef Report, pp 54-58). Thereduction in N lost was achieved byreducing diet digestibility, increas-ing fecal N output, and increasingOM on the pen surface.Fecal N is more stable than uri-nary N. Increasing the amount offermentable carbohydrates to thehind gut, via feeding a lower digest-ible diet, is an effective means toincrease fecal N (1996 Nebraska BeefCattle Report, pp 74-77). The conse-quence of reducing diet digestibilityis reduced feed efficiency in cattle(2002 Nebraska Beef Cattle Report, pp54-57; 2003 Nebraska Beef Report, pp54-58).Corn steep is a by-product of thewet corn milling industry that is acombination of both distillers solu-bles and steep liquor. It has a high-er energy value than DRC (1998Nebraska Beef Cattle Report, pp 69-71). The objective of the followingmetabolism study was to evaluatethe effect of corn bran and steepinclusion in finishing diets on dietdigestibility and rumen environ-ment.ProcedureEight ruminally cannulatedcrossbred heifers were used in areplicated 4 x 4 Latin squaredesign. All diets included 15% cornsilage, 5% supplement and DRC.Treatments included a 0% cornbran control (CON), 30% bran(30/0), 30% bran/15% steep(30/15), and 45% bran/15% steep(45/15), with by-products replacingDRC and molasses (Table 1). Thesediets were similar in composition tothose fed in two finishing trialsused to evaluate cattle performanceand N mass balance (2005 NebraskaBeef Cattle Report, pp 54-56). Periodsincluded 16-day adaptation and5-day collection. Chromic oxidewas used as a marker to determinetotal tract digestibility, dosed 7.5 g,twice daily through the rumen can-nula. The chromic oxide was dosed72 hours before the first collectionday, to ensure it was equally con-centrated throughout the digesta.Fecal samples were taken threetimes during each collection day,dried in a 60oC oven for 48 hours,and composited. Intake was con-tinuously measured similar to thesystem described by Cooper et al.,(1997 Nebraska Beef Report, pp 49).Ruminal fluid was collected priorto feeding and at 2, 4, 6, 8, 10 and12 hours after feeding on each ofthe 5 days during a collectionperiod.An in-situ trial also was con-ducted during the final collectionperiod. Corn bran and DRC wereincubated as-is at time points of 0,12, 24, 48, and 96 hours, with cornbran extent of 96 hours and DRC ata 48-hour extent. Each time pointused two steers per diet and tworeplications per sample, with anempty dacron bag incubated for acontrol. Both bran and DRC wereevaluated for DM disappearance2005 Nebraska Beef Report — Page 40rate; corn bran also was evaluatedfor NDF disappearance rate withineach of the four diets. Potentialdigestible fractions were calculatedby subtracting the extent hour valuefrom the 0 hour value. A log trans-formation calculation was used tocalculate DM and NDF disappear-ance rates (%/hour).ResultsDry matter intake was similaramong all treatments, averaging 25lb/day (P > 0.10; Table 1). By-product diets had higher ruminalpH (5.96) than CON (5.75), aver-aged across all time points(P < 0.01; Table 2). The lower rumi-nal pH supports the concept thatfeeding by-products helps mini-mize the effects of acidosis. Acetate:propionate ratios were 2:09, 2:25,2:30, and 2:52 for the CON, 30/0,30/15, and 45/15 diets, respec-tively (P<0.05). When diets had ahigher fiber content (i.e. branincluded in the diet), acetate con-centrations were higher and propi-onate concentrations were lower.Total tract DM digestibility(Table 2) was higher in CON thanby-product diets (79% vs 73.0%,P < 0.01), as was OM digestibility(80.2% vs. 74.6%, P < 0.01). Steepprovided no improvement in DM orOM digestibility of the 30/15 diet.This is somewhat different fromprevious research that evaluated15% corn bran and 15% corn branplus 15% steep (15/15). Scott et al.(1998 Nebraska Beef Report, pp 69-71) reported the DM digestibility ofa 15% bran diet to be 80%, while the15/15 diet was 83% digestible.Although there was no statisticaldifference in the data from Scott etal., (1998) steep did tend to improvetotal tract digestibility.In-Situ ResultsDM disappearance (%/hour) ofDRC was lower in CON diet thanby-product diets (P < 0.01; Table 3),suggesting that because the rumenpH was higher in the byproductTable 1. Composition of dietary treatments for metabolism and in situ trials (% DMbasis).Ingredient CON 30/0 30/15 45/15Dry Rolled Corn 75 45 35 20Corn Silage 15 15 15 15Corn Bran — 30 30 45Steep — — 15 15Molasses 5 5 — —Dry Supplementa 5 5 5 5Nutrient Composition (%)CPb 13.7 13.4 14.0 14.2Calciumc 0.70 0.70 0.70 0.70Phosphorusc 0.32 0.26 0.47 0.44aSupplement formulated to provide 28g/ton Rumensin® and 10 g/ton Tylan®.bCalculated based on CP analysis of feedstuffs.cCalculated using tabular values for ingredients.Table 2. Effect of dietary treatment on DM intake, total tract digestibility, and ruminalpH.TreatmentaItem CON 30/0 30/15 45/15 SE b F-TestcAvg pHd 5.75g 5.95h 5.94h 5.98h 0.06 <0.01DM Intake, lb/d 23.8 25.8 25.4 25.2 1.4 0.56DM Digested, lb/d 18.8 19.0 18.5 18.3 1.0 0.90DMD,%e 79.0g 73.7h 72.8h 72.6h 1.5 0.03OM Intake, lb/d 22.1 24.0 23.6 23.4 1.3 0.56OM Digested, lb/d 17.7 18.0 17.6 17.4 1.0 0.95OMD,%f 80.2g 75.0h 74.4h 74.4h 1.5 0.03aCON = dry rolled corn based diet with no by-product inclusion; 30/0 = dry rolled cornreplaced with 30% bran and 0% steep; 30/15 = dry rolled corn and molasses replacedwith 30% bran and 15% steep; 45/15 = dry rolled corn and molasses replaced with 45%bran and 15% steep.bStandard error of the mean.cData were analyzed using a protected F-test where numbers represent P-value forvariation due to treatment.dAvg pH = average pH.eDMD = DM digestibility.fOMD = OM digestibility.ghMeans within row with unlike superscripts have differing values.Table 3. Disappearance rates (%/hour) of corn bran and dry rolled corn incubatedwithin each dietary treatment.TreatmentaItem CON 30/0 30/15 45/15 SE b F-TestcDMd (corn)d 2.36f 2.71g 2.99g 2.89g 0.22 <0.01DMd (bran)d 0.76f 2.18g 1.70g 1.92g 0.22 <0.01NDFd (bran)e 0.82f 1.71g 1.79g 2.08h 0.05 <0.01aCON = dry rolled corn-based diet with no by-product inclusion; 30/0 = dry rolled cornreplaced with 30% bran and 0% steep; 30/15 = dry rolled corn and molasses replacedwith 30% bran and 15% steep; 45/15 = dry rolled corn and molasses replaced with 45%bran and 15% steep.bStandard error of the means.cData were analyzed using a protected F-test where numbers represent P-value forvariation due to treatment.dDMd = Dry matter disappearance rate calculated as%/hour.eNDFd = NDF disappearance rate calculated as%/hour for corn bran.fghMeans with unlike superscripts within row have differing values.Page 41 — 2005 Nebraska Beef ReportFigure 1. Corn bran NDF disappearance (%), reported at 12, 24, 48, and 96 hours,incubated within each dietary treatment.1009080706050403020100% NDF DisappearanceCON30/030/1545/150 20 40 60 80 100Hourdiets, the microbial population wasmore efficient at digesting the DRC.The NDF content of corn bran was72.9%. NDF disappearance rates(%/hour) were highest for the45/15, similar for 30/0 and 30/15,and lowest for CON (P < 0.01; Table3). This suggests that when cornbran is increased in the diet, themicrobial population has morecellulolytic bacteria. A higher cellu-lolytic bacteria population wouldpromote an increase in the acetate:propionate ratio, as well as anincrease in ruminal fluid pH.The percentage of NDF dis-appearance was not differentamong diets at 0, 12 and 24 hours;however, at 48 and 96 hours (Figure1), the NDF disappearance for branwas lower for CON than by-product diets (P < 0.01). Digestionof corn bran occurred to a furtherextent when bran was incubated in30/0, 30/15, and 45/15 diets, com-pared to incubation in the CONdiet. These data support the theorythat because of a higher ruminalpH and an altered microbial popu-lation, digestion of both dry rolledcorn and bran occurs to a greaterextent.While adding steep to the dietdid not improve total tract digest-ibility, it did improve cattle perfor-mance (2005 Nebraska Beef Report,pp 54-56). By-product diets areeffective in reducing acidosis, andhave lower dry matter and organicmatter digestibilities than typicalcorn-based diets, regardless of steepinclusion. Rate of corn brandigestion and extent is greater inby-product-based diets. Feedingcorn bran and steep in combinationis an effective means of promotingfiber digestion, and maintaining ahealthier rumen environment.1Kristi M. Sayer, graduate student,Galen E. Erickson, assistant professor,Terry J. Klopfenstein, professor, Tim W.Loy, former research technician, AnimalScience, Lincoln.

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Effect of Corn Bran and Corn Steep Inclusion in Finishing Diets on Diet Digestibility and Fiber Disappearance

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