Cien. Inv. Agr. 37(3):39-46. 2010
www.rcia.uc.cl
research paper
Effects of autoclaving on the apparent digestibility coefficient
of dehulled pea seed meal (Pisum sativum L.) in rainbow trout
(Oncorhynchus mykiss W.)
Adrián Hernández1, 2, Aliro Bórquez1, 2, Leonardo Alcaíno1, 2, Jorge Morales1,
Patricio Dantagnan1, 2 and1 Patricio Saez1, 2, 3
1
Escuela de Acuicultura, Universidad Católica de Temuco. Casilla 15-D, Temuco, Chile.
Unidad de Nutrición Acuícola, Centro de Genómica Nutricional Agro-acuícola. Casilla 58-D, Temuco, Chile.
3
UG/OMNR Fish Nutrition Research Lab, Department of Animal and Poultry Science, University of
Guelph, Guelph, Ontario, Canada N1G 2W1.
2
Abstract
A. Hernández, A. Bórquez, L. Alcaíno, J. Morales, P. Dantagnan, and P. Saez. 2010. Effects
of autoclaving on the apparent digestibility coefficient of dehulled pea seed meal (Pisum
sativum) in Rainbow trout (Oncorhynchus mykiss). Cien. Inv. Agr. 37(3): 39-46. The effect
of autoclaving on the nutrients’ apparent digestibility coefficient (ADC), digestible protein and
energy of pea seed meal (P. sativum) fed to Rainbow trout (O. mykiss) was examined. Two
samples of the pea meal were autoclaved at 121ºC and 1.1 atm for 5 min (5’APM) or 15 min
(15’APM), respectively. A third sample, used as control, was not treated (RPM). One reference
diet (Basal diet) and 3 experimental diets were elaborated and labelled based on autoclaving
time applied to the ingredient (RPM, 5’APM and 15’APM). The four diets were assigned using
a completely randomised design, with each treatment having three replicates. 12 tanks were
stocked each with 15 trouts with an average weight of 235 ± 10.4 g. Faeces were collected over
a 7-day period using a settlement column and pooled within the tank. ADCs were determined
using chromium oxide (Cr2O3) as an inert digestibility indicator. No significant differences
(P>0.05) regarding protein ADC were found among all treatments. On the other hand, dry
matter, energy and nitrogen free extract (NFE) ADC showed significant differences (p<0.05)
among all the different treatments. Results showed that 5’APM improved dry matter, protein,
and energy ADC of the dehulled pea seed meal in diets for rainbow trout.
Key words: Autoclaving, apparent digestibility coefficient, pea seed meal, rainbow trout.
Introduction
Feeding plays a key role in any intensive aquaculture operation. Fishmeal has been used as
the main protein source in salmonid feeds beReceived July 10, 2009. Accepted January 21, 2010.
Corresponding author: ajhernandez@uct.cl
cause of its high nutritional quality; however,
it is also one of the most expensive ingredients
(Wang et al., 2008).
The nutritional value of an ingredient or diet depends on its chemical composition, but also on
how much of its nutrients the fish can absorb and
utilize (NRC, 1993). Based on that, the need for
reliable methods to study the ingredient and diet
40
CiENCiA E iNvESTiGACióN AGRARiA
utilization has resulted in the development of
several methodologies to estimate the amount
of nutrients that are absorbed and available to
the fish (Vandenberg and De la Noüe, 2001). In
this regard, Allan et al. (2000), claimed that nutrient digestibility determination is the first step
in evaluating the potential use of an ingredient
in diets for reared species.
Legume seeds appear to be an acceptable source
of protein for animal feed formulation, due to
their relatively low cost and long conservation
time (Trugo et al., 2000). Among legumes, pea
seed (Pisum sativum L) has become widely
available as a low cost protein source for animal
feed. However, despite the nutritional potential of peas as an inexpensive and rich source
of proteins, carbohydrates, vitamins and some
minerals, the utilization of this legume has been
limited by its low protein digestibility, essential
amino acid deficiency and the presence of certain anti-nutritional factors. Among these are:
phytic acid, condensed tannins, polyphenols,
protease inhibitors (trypsin and chymotrypsin),
α-amylase inhibitors and lectins, which reduce
the nutritional quality of the protein (Alonso et
al., 1998).
Several industrial or home scale processes, such
as soaking, germination, dehulling, milling,
cooking, roasting or fermentation have been
used to improve the nutritional properties of
legumes. However, the efficacy of these treatments has been found to be variable (Alonso et
al., 2000).
Several studies have been carried out in order to demonstrate the potential of peas and
related feedstuffs in formulated diets for fish.
Gomes et al. (1993) showed that colzapro, a
co-extruded product of rapeseed (Brassica
napus L.) meal and pea seed, can be utilized
in rainbow trout (Oncorhynchus mykiss W.)
diets at levels up to 20% without negative
effects on growth, nitrogen or energy utilization and muscle fatty acid composition.
Gouveia and Davis (2000), after an 11-week
feeding trial, observed a positive but nonsignificant trend for both growth and feed uti-
lization with increasing incorporation of pea
seed meal in diets for juvenile European sea
bass (Dicentrarchus labrax L.).
The aim of this trial was to determine whether
different periods (5 and 15 minutes) of heat/
pressure treatment (autoclave) may have an effect on the nutrient apparent digestibility coefficient (ADC) and digestible protein and energy
of dehulled pea seed meal in pelletized diets for
rainbow trout.
Material and methods
Ingredients
Pea beans (P. sativum cv. Nitouche) were kindly
donated by the iNiA Carillanca, Chile; the sample was dehulled and ground to < 300 µm particle size. Afterwards, two samples of the pea
meal were autoclaved at 121 ºC and 1.1 atm for 5
or 15 min; these were labelled 5-min autoclaved
pea meal (5’APM) and 15-min autoclaved pea
meal (15’APM), respectively. These samples
were oven-dried at 50 °C for approximately 15
hrs. A third not-treated sample was used as control and labelled as raw pea meal (RPM). The
nutritional composition of the ingredient is presented in Table 1.
Diets
The ingredients of the basal diet were thoroughly mixed and used for further elaboration of all
experimental diets. The ingredient of study for
each test diet was added to a sub-sample of the
basal diet in a proportion of 30:70, respectively.
Diets were processed by addition of water (about
25% of mash dry weight) while mixing to form
dough, which were subsequently screw pressed
using a 3.5 mm diameter die. The resultant
moist pellets were oven-dried at 60 °C for approximately 15 H. The basal diet was prepared
in a similar manner. Formulation and chemical
composition of the experimental diets are presented in Table 2.
41
vOLUME 37 Nº3 SEPTEMBER - DECEMBER 2010
Table 1. Nutrient composition of the experimental ingredients 1.
RPM
5’APM
15’APM
Dry Matter
89.85
91.37
91.17
Protein
24.93
25.80
25.14
1.09
1.74
1.24
69.69
68.41
69.82
Fiber
1.42
1.30
1.08
Ash
2.88
2.75
2.73
16.68
16.90
16.67
Fat
Nitrogen free extract
Gross energy (MJ·kg-1 Dry matter)
1
-1
g·kg dry matter, unless otherwise indicated.
Table 2. Formulation and chemical composition of the experimental diets1.
ingredient
Basal diet
RPM
5’APM
Fish meal2
65
45.5
45.5
Fish oil3
11
Raw pea meal4
0
30
0
0
5’ autoclaved pea meal
0
0
30
0
15’ autoclaved pea meal6
0
0
0
30
Pregelatinized starch7
15
5
Cellulose8
vitamin premix
9
7.7
7.7
15’APM
45.5
7.7
10.5
10.5
10.5
6.5
4.6
4.6
4.6
0.5
0.4
0.4
0.4
Mineral premix10
0.5
0.4
0.4
0.4
Chromium oxide11
1.5
1.1
1.1
1.1
Diet Nutrient Content
Dry matter
93.48
93.04
92.95
93.16
Protein
46.82
40.25
40.29
39.68
Lipids
18.09
11.59
12.53
12.6
Nitrogen free extract
18.57
33.87
32.42
33.72
Fiber
4.24
4.91
5.04
4.69
Ash
12.28
9.38
9.73
9.31
1.67
1.24
1.23
1.20
20.51
19.39
19.53
19.46
Chromix oxide
Gross energy (Mj·kg-1)
1
-1
g·kg dry matter, unless otherwise indicated.
Supplied by Pesquera San Jos S.A., Chilean jurel meal super prime (Prot. 68%,
Fat 9.9%, Ash 14.5%).
3
Supplied by BioMar Chile S.A., Puerto Montt, Chile.
4, 5, 6
Produced from pea bean and processed as described in material and methods
Section.
7
Supplied by Mathiesen SAC, Santiago, Chile.
8
Supplied by Sigma – Aldrich α-cellulose (Fibers).
9
vitamins includes (iU/kg or g/kg of premix): vitamin A 1.0 MiU; vitamin D3,
0.5 MiU; vitamin E, 0.04 MiU; vitamin K3, 4 g; vitamin B1, 4 g; vitamin B2,
6 g; vitamin B5, 10 g; vitamin B6, 2 g; vitamin B9, 1.6 g; vitamin B12, 0.00 4g;
Niacin, 40 g; Biotin, 0.1 g; vitamin C 100 g; Choline, 200 g; inositol 50 g.
10
Minerals includes (g/kg of premix): Manganese, 50 g; Zinc, 100 g; Copper, 2 g;
Ferrous iron, 35 g; Selenium, 0.1 g; iodine, 4 g; Cobalt, 0.4 g.
11
Supplied by Sigma – Aldrich Chromiun (iii) oxide.
2
42
CiENCiA E iNvESTiGACióN AGRARiA
Fish handling
Hatchery-reared, same cohort rainbow trouts
(O. mykiss) were transferred from the Experimental Station Los Laureles (IX region, Chile)
to cylinder-conical tanks (500 L) at the Escuela
de Acuicultura, Universidad Católica de Temuco, Temuco, Chile. Freshwater (14.6 ± 0.1 °C)
was supplied to each of the tanks at a change
rate of 1.0·H-1. Twelve tanks were stocked each
with 15 trouts with an average weight of 235.1 ±
10.4 g. Fish were acclimatized to the tanks and
to each dietary treatment during 10 days before
initiating the faecal collection (Glencross et al.,
2003). Fish were fed manually twice a day, and
faeces were collected using a settlement column
faecal collector as described by Bureau and Cho
(1999). Faeces were collected over a period of
7 days. During this time, samples were pooled
within the tank and kept at -80 °C before being freeze-dried for 48 hours in preparation for
analysis.
Chemical and digestibility analysis
Diets and faecal samples were analysed for dry
matter, chromium oxide, ash, fibre, fat, nitrogen
and gross energy content. Dry matter was calculated by gravimetric analysis following ovendrying at 105 °C for 24 hours. Chromic oxide
levels were determined spectrophotometrically
following the digestion and oxidation of samples using a modified Furukawa and Tsukahara
(1966) technique. Protein levels were calculated from the determination of total nitrogen
by Kjeldhal digestion, based on N*6.25. Total
lipid content was determined gravimetrically
following extraction of the lipids with solvent
(Soxhlet). Ash content was determined gravimetrically following loss of mass after combustion of a sample in a muffle furnace at 550 °C for
3 hours. Fibre content was calculated by gravimetric analysis following oven-drying at 105 °C
for 24 hours, after acid and alkali digestion with
Sulphuric acid and Sodium hydroxide respectively. Nitrogen free extract (NFE) content was
determined by the difference approach. Gross
energy content was determined by adiabatic
bomb calorimeter using benzoic acid as the
standard. All of these determinations were con-
ducted according to the methods specified by
the AOAC (Association of Official Analytical
Chemists) (1995), unless otherwise indicated.
Diet apparent digestibility coefficients (ADCDiet)
were calculated using the formula:
Nutrient Faeces Cr2 O3 Diet
×
ADC Diet = 100 − 100 ×
Nutrient Diet Cr2 O3 Faeces
Cr2O3Diet and Cr2O3Faeces represent the chromium
oxide content of the diet and faeces, respectively. NutrientDiet and Nutrientfaeces represent the
nutritional variables of concern (dry matter, protein or energy) contained in the diet and faeces,
respectively (Glencross et al., 2003). The digestibility values of the test ingredients examined
in this study were calculated according to the
formula:
ADCTest × Nutrient Test − ( ADC Basal × Nutrient Basal × 0.7)
ADC Ingredient =
(0.3 × Nutrient Ingredient )
Where ADCingredient is the digestibility of the
test ingredient included in the test diet at 30%.
ADCtest is the apparent digestibility of the test
diet. ADCbasal is the apparent digestibility of the
basal diet, which represents 70% of the test diet
(Cho and Kaushik, 1990).
Digestible protein and energy of the diets were
calculated by multiplying the apparent protein
and energy digestibility coefficients (CDA) by
the protein and energy content determined for
each ingredient respectively.
Design and Statistical analysis
Treatments were assigned to the experimental array on a completely randomised design,
with each treatment having three replicates.
All were mean values unless otherwise specified. Data were analysed for homogeneity using Levene’s test. Effects of ingredient on digestibility of dry matter, protein, energy and
NFE in each of the ingredient were examined
by one-way ANOVA. Levels of significance
were determined using the Tuckey’s test. Percentage values for ADC were normalized by
the arcosine transformation according to Sokal
and Rohlf (1969). Limits for all critical ranges
43
vOLUME 37 Nº3 SEPTEMBER - DECEMBER 2010
were set at P < 0.05. All statistical analyses
were carried out using the SPSS version 11.5
(SPSS inc, Chicago, USA, 2009).
was significantly (P<0.05) lower with a value of
10.40 MJ·kg-1, but higher than RPM, which had
a value of 7.77 MJ·kg-1.
Results
Discussion
Nutrients’ ADC and digestible protein and
energy values are presented in Table 3. There
were not significant differences (P>0.05) regarding protein ADC among treatments. On the
other hand, dry matter, energy and NFE ADCs
showed significant differences (P<0.05). Dry
matter ADC was significantly higher (P<0.05)
for the 5’APM and 15’APM treatments with values of 59.29 and 57.92% respectively. Regarding
energy, the ADC for 5’APM treatment had the
highest (P<0.05) value (68.58%); on the other
hand, RPM (46.59%) was significantly lower
(P<0.05) than 15’APM (62.41%). The ADC for
NFE showed a significant (P<0.05) increment
when the autoclave treatment was applied, although there were no differences (P>0.05) as
the heat/pressure exposure time was increased,
with values of 37.71 and 42.74% for 5’APM and
15’APM respectively.
There are several nutritional factors affecting
the decision to include plant protein into salmonid diets, and pea seed meal is not the exception. Although it is a rich source of protein,
carbohydrates, fibre, vitamins and minerals
(vidal-valverde et al., 2003), it has been reported that pea seed contains some anti-nutritional
components that reduce its nutritive value for
salmonid species. These factors include trypsin inhibitors, lectins (phytohaemagglutinins),
gallic acid, tannins, cyanogens, phytic acid,
saponins, antivitamins and other phenolic acids and substances with phytestrogenic effects
(Francis et al., 2001; Dvorak et al., 2005). Most
of them are thermo labile compounds, and heat
treatments have been proved to be an effective
way to reduce or eliminate some of these antinutritional factors and increase the nutritional
value of this ingredient in diets for different
species (Conan and Carre, 1989; Periago et al.,
1996; Farhoomand and Poure, 2006; Stein and
Bohlke, 2007).
in the same way, results for digestible energy
and protein were significantly different (P<0.05)
after the heat/pressure treatment. Digestible
protein was significantly higher (P<0.05) for
5’APM with a value of 223.78 g·kg-1 ingredient,
compared with 203.78 and 207.98 for RPM and
15’APM, respectively.
it is recognized that heat processing is an effective method for inactivating trypsin inhibitors in soybeans (Stein and Bohlke, 2007). Heat
treatment may also induce conformational
changes in the pea proteins, which may make
them more accessible to digestive enzymes and
thus increase amino acids digestibility. in this
Finally, for digestible energy, 5’APM reached
the highest value of 11.59 MJ·kg-1, then 15’APM
Table 3. Apparent digestibility coefficient and digestible protein and energy for the ingredient under different treatments
ADC
RPM
5’APM
15’APM
Dry Matter
47.33 ± 2.22a
59.29 ± 3.97b
57.92 ± 3.37b
Protein
81.74 ± 3.29a
86.72 ± 1.67a
82.74 ± 2.99a
Energy
a
46.59 ± 1.65
b
68.58 ± 1.28
62.41 ± 2.32c
Nitrogen free extract
32.04 ± 0.25a
37.71 ± 6.82ab
42.74 ± 0.89b
203.78 ± 8.19a
223.78 ± 4.30b
207.98 ± 5.31a
7.77 ± 0.28a
11.59 ± 0.22b
10.40 ± 0.27c
Digestible protein and energy
Digestible Protein (g·kg-1 ingredient)
Digestible Energy (Mj·kg-1)
values are mean ± Standard deviation (n = 3).
a, b, c
different superscripts among rows denote significant differences at P < 0.05.
44
CiENCiA E iNvESTiGACióN AGRARiA
work, although there were not significant differences in protein ADC among the treatments,
there was a trend to increase this value with
the 5’APM treatment and then to decrease for
the 15’APM treatment. in this regard, Alonso
et al. (2000) claimed that thermal processing
may also impair the quality and availability of
some nutrients depending on the technology
and conditions used; some amino acids can become unavailable after thermal treatment. This
is due to the formation of cross-links or to Maillard condensation with reducing carbohydrates.
Arndt et al. (1999) reported this kind of effect
in soybean meal after extended heating. Nevertheless, the digestible protein results (Table
3) showed a significantly higher (P<0.05) value
after the 5’APM treatment, meaning that there
is a higher level of protein being digested (g·kg-1
ingredient). This is very interesting taking into
account that all pea meal (raw and autoclaved)
had the same protein content (Table 1), suggesting a better protein utilization for fish growth,
which may be subject of further research on this
technological pre-process.
Another important concern regarding inclusion
of vegetable protein sources into carnivorous
animal diets is related to their content of nonstarch-polysaccharides (NSP). The alfa-galactoside linkages of these polysaccharides are not
broken down by digestion in the gut of monogastric animals (Diaz et al., 2006). The pea seed
meal used in this trial presented a NFE values
ranging from 68.41 to 69.82% on a dry matter
basis; starch is a main component of pea seed,
and dehulled pea seeds contain approximately
52% starch on a dry matter basis (Cousing,
1997). So basically, improving digestibility of
NFE depends on how the heat/pressure treatment affects the starch components, because
even though starch is not an anti-nutritional
factor, it is poorly digested and nutrient utilization can be affected by high starch levels in carnivorous fish diets (Thiessen et al., 2003). NFE
apparent digestibility in this experiment was
significantly (P<0.05) enhanced by autoclaving
treatment in both 5’APM and 15’APM. These
results indicate that autoclaving of pea meal improves the access of digestive enzymes to the
starch molecule. in this respect, Periago et al.
(1996) stated that starch digestibility could be
affected by many other factors, such as starch
granule structure and amylase/amylopectin
proportion. in that sense, the main advantage of
heating treatment on peas is the matrix structure change and starch granular disruption via
gelatinization (Stein and Bohlke, 2007). On the
other hand, pea starch contains up to 34% amylose, which is known to have a greater digestibility improvement with heat treatment (Thiessen et al., 2003).
Regarding digestible energy content of the
ingredients, it was significantly (P<0.05)
improved by treatments, being 5’APM the
ingredient with the highest value for this parameter. The use of autoclaving, as with other
processes such as extrusion, have shown to
be important in increasing the nutrient availability of plant meals, especially in incresing the amount of digestible energy available
through greater starch gelatinization (Borlongan, 2003). This factor might be of significant
importance if we take into account that peas,
compared to soy bean or canola, comprise
the energy fraction as starch instead of oil
(Thiessen et al., 2003).
Results of this work demonstrated that 5 min at
1.1 atm autoclaving treatment significantly enhances on dry matter, energy and NFE ADC.
Furthermore, significantly higher (p<0.05) values for total digestible energy and protein of the
diet may make this pre-treated ingredient a new
alternative for the formulation of cost-effective
diets for salmonids; however, further research
on growth trials are needed to assess the actual
nutritive value of autoclaved pea seed meal for
fish.
Acknowledgements
This study was supported by the “Dirección
General de investigación de la Universidad
Católica de Temuco” Project DGiUCT 200703-16.
vOLUME 37 Nº3 SEPTEMBER - DECEMBER 2010
45
Resumen
A. Hernández, A. Bórquez, L. Alcaíno, J. Morales, P. Dantagnan y P. Saez. 2010. Efectos
del autoclave sobre el coeficiente de digestibilidad aparente de la harina descascarada
de arveja (Pisum sativum) en trucha arco iris (Oncorhynchus mykiss). Cien. Inv. Agr.
37(3):39-46. Se evalúo el efecto del tratamiento de autoclave de la harina de arveja (P. sativum)
sobre los Coeficientes de Digestibilidad Aparente (CDA) de nutrientes, para trucha arco iris
(O. mykiss). Dos muestras de harina de arveja fueron autoclavadas a 121 ºC y 1,1 atm por 5
min (5’ APM) y 15 min (15’ APM) respectivamente; una tercera muestra, usada como control,
no fue tratada (RPM). Las dietas fueron elaboradas y etiquetadas de acuerdo al tratamiento
aplicado al ingrediente. Los tratamientos fueron aplicados en un diseño completamente
aleatorio, y cada tratamiento se aplicó en triplicado. 15 peces con un peso promedio de 235
± 10,4 g fueron transferidos a tanques cilindro-cónicos (500 L) con flujo de agua dulce. Las
heces fueron colectadas usando una columna de decantación en cada tanque por un periodo
de 7 días. Los CDAs fueron determinados usando oxido de cromo (Cr2O3) como indicador
inerte de digestibilidad. No hubo diferencias significativas (P>0,05) con respecto a los CDAs
de proteína entre los tratamientos. Por otra parte, los CDAs de materia seca, energía y extracto
no nitrogenado (ENN) fueron estadísticamente diferentes (P<0,05). Los resultados demostraron
que el tratamiento 5’APM incrementó el CDA de materia seca, además de energía y proteína
digestible de la harina descascarada de arveja.
Palabras clave: Autoclave, coeficiente de digestibilidad aparente, harina de arveja, trucha
arco iris.
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