Effects of Yeast Glucomannan and Sodium Bentonite on the Toxicity of Aflatoxin in Broilers

ABSTRACT

The aim of this study was to evaluate the efficacy of a yeast glucomannan (YG) and sodium bentonite (SB) in reducing the toxicity of aflatoxin for broilers fed a diet naturally contaminated with aflatoxin. In total, 300 7-day-old Ross 308 broilers were randomly assigned to 10 dietary treatments, consisting of a diet with no aflatoxin (positive control), a diet naturally contaminated with 250 ppb aflatoxin (negative control), and eight aflatoxin-contaminated diets supplemented with different SB and YG and their combinations. Serum biochemical parameters and liver pathological changes were investigated when broilers were 42 days old. The birds fed the negative control diet presented lower uric acid, cholesterol, and triglyceride levels and higher in AST and ALT activities compared with the positive control group. In addition, negative-control birds also showed significant histopathological changes (p<0.05), including slight to moderate hydropic degeneration and/or fatty changes (8 cases), bile-duct hyperplasia (7 cases), periportal fibrosis (5 cases), cells infiltration (4 cases), congestion (3 cases) as well gross pathological changes. The addition of YG and SB to the aflatoxin-contaminated diet partially alleviated the negative effects of aflatoxin. However, the supplementation 0.1% YG alone to the aflatoxin-contaminated diet significantly prevented the adverse effects of aflatoxin on serum biochemical parameters and pathological liver changes and was found to be more effective than other treatments.

Keywords:
Aflatoxin; biochemical parameters; broilers; pathological changes; yeast glucomannan

INTRODUCTION

Aflatoxins are potent mycotoxins produced mainly by Aspergillus flavusand Aspergillus parasiticus. They are considered a significant problem in poultry production and public health because they cause considerable economic losses and severe health problems.

Various symptoms are associated with aflatoxicosis in poultry. The most common are weakness, anorexia with reduced growth rate, poor feed utilization, slow weight gain, decreased egg weight and production, and increased mortality (Oguz et al., 2000). The toxicity of aflatoxin in poultry has been extensively studied to determine their teratogenic, carcinogenic, mutagenic, and growth-inhibition effects (Oznurlu et al., 2012). The biochemical, hematological (Basmacioglu et al., 2005; Azizpouret al., 2012), immunological (Mogadam & Azizpour, 2011), and pathological (Ortatatli & Oguz, 2001) effects of aflatoxins have also been described in depth. Aflatoxins may also cause significant gross and microscopic changes in the liver, such as hepatomegaly, paleness, hydropic degeneration, fatty liver, bile-duct hyperplasia, and periportal fibrosis (Karaman et al., 2005; Ortatatli et al., 2005).

Preventing mold growth and aflatoxin contamination of feeds and feedstuffs essential, but when contamination is inevitable, aflatoxin must be inactivated before these materials are used. Producers, researchers, and governments have tried to apply efficient prevention management practices and decontamination technologies to minimize the toxic effects of aflatoxin in animal production. In addition to prevention strategies, other novel approaches including physical, chemical, and biological treatments to detoxify aflatoxin in contaminated feeds and feedstuffs have been employed (Parlat et al., 2001).

Since the early 1990s, studies on adsorbents-based strategies to eliminate mycotoxins from contaminated feeds and to minimize their effects of toxicity on poultry health have been carried out (Oguz, 2012). Zeolites (Modirsanei et al., 2004; Khadem et al., 2012), bentonites (Ibrahim et al., 2000; Rosa et al., 2001; Eraslan et al., 2004; Abousadiet al., 2007; Manafi, 2009; 2012), and yeast and esterified glucomannans (Raju & Devegowda, 2000; Aravind et al., 2003; Girish & Devegowda, 2006; Che et al., 2011; Mosca & Marichal, 2011; Rosaet al., 2012) have been shown to reduce aflatoxin absorption in the gastrointestinal tract. Some studies suggest that the best approach for decontamination is biological degradation, using yeast and yeast components, which may remove aflatoxin under mild conditions, without having to use harmful chemicals or causing any noticeable losses in the nutritional value or palatability of diets (Shetty et al., 2007;Oguz, 2012).

The objectives of the present study was to evaluate the toxic effects of aflatoxin (250 ppb) on serum biochemical parameters and liver gross and microscopic changes in broilers, and to determine the possible preventive effects of the dietary addition of a glucomannan-containing yeast product (Mycosorb; 0.05% and 0.1%) and sodium bentonite (1.5% and 3%) on serum biochemical parameters and pathological changes induced by aflatoxin in broilers.

MATERIALS AND METHODS

Birds and diets

In total, 325 one-day-old Ross 308 male broilers were obtained from a commercial broiler producer. Birds were submitted to a 7-day adaptation period before the beginning of the trial. Subsequently, birds were submitted to commercial broiler management practices and housed in an environmentally controlled broiler house on floor pens with litter.

Three hundred birds, with similar body weight, were randomly designated to 30 pens. They were fed a commercial starter feed (based on corn and soybean meal, containing 20.84% CP, 2900.29 ME) up to 21 days of age and a grower diet (19.68% CP, 3150 ME) from 22 to 42 days. Birds had access to feed and water ad libitum from one to 42 days of age. The basal diet was supplemented with amino acids, mineral and vitamins at the levels recommended by the National Research Council (NRC, 1994), and did not contain any antibiotics, coccidiostats, or growth promoters. In addition, birds were inspected daily and any health problem was recorded. Lighting was supplied for 23 h daily.

Treatments

The birds (three replicates of 10 chicks each) were designated to the following treatment groups: 1) positive control diet, consisting of the basal diet with no aflatoxin or additives (control); 2) negative control diet, consisting of a diet naturally contaminated with aflatoxin (250 ppb; NCD); 3) NCD supplemented with 1.5% sodium bentonite (SB); 4) NCD supplemented with 3% SB; 5) NCD supplemented with 0.05% yeast glucomannan (YG); 6) NCD supplemented with 0.1% YG; 7) NCD supplemented with 1.5% SB+ 0.05% YG; 8) NCD supplemented with 1.5% SB+ 0.1 % YG; 9) NCD supplemented with 3% SB + 0.05% YG; and 10) NCD supplemented with 3% SB+ 0.1% YG

Aflatoxin quantification and diet preparation

Individual feed ingredients were analyzed and screened for aflatoxin content. Aflatoxin was extracted according to Romer (1975), and quantified by thin-layer chromatography (TLC). The basal control diet was formulated to supply the nutritional requirements of commercial broilers (NRC, 1994) during the starter and grower periods.

The basal diet did not contain any detectable aflatoxin levels (below 1μg/kg diet; ppb). Corn was obtained from a private feed mill (already contaminated with mold) and was stored at 20% moisture for two months to promote mold growth. The presence of aflatoxin in the corn was confirmed by TLC. Aflatoxin-free corn was replaced with naturally contaminated corn in the formulation of the contaminated-diet treatments. The samples were randomly selected from four different portions of the whole sample. The analysis of the contaminated diet showed it contained 250 ppb aflatoxin (detection limit: 1 ppb). The aflatoxin in the contaminated diet was composed of 84.72% AFB1, 5.50% AFB2, 8.20% AFG1, and 1.58% AFG2.

During the experimental period, the control and the contaminated diets were analyzed for aflatoxin and other mycotoxins. The levels of aflatoxin in the control diet were below the detection limits. Aflatoxin levels in the contaminated diet ranged from 240 to 250 ppb. The presence of other mycotoxins was not detected.

Serum biochemistry

At the end of the trial, when broilers were 42 days old, 10 birds per treatment were randomly selected for blood collection from the wing vein for biochemical analysis. Blood was centrifuged at 1400 × g at 8°C for 30 min (Sorvall, RC 3 B plus) and the serum separated and preserved at −20°C until biochemical analyses. Serum concentrations of cholesterol, uric acid, triglycerides, and the activities of the enzymes aspartate aminotransferase (AST) and alanine aminotransferase (ALT) were determined using an automatic analyzer (Tokyo Boeki, TMS, 1024, Japan) with commercial test kits (Spinreact, Spain).

Pathological examination

After blood collection, the 10 previously selected birds were weighed and euthanized for pathological examination. The liver was removed, cleaned, weighed, and its relative weight (g liver/100 g live body weight) was calculated. Liver tissue samples were collected in 10% neutral buffered formalin. Upon fixation, samples were dehydrated in graded alcohol series, cleared in xylene, and embedded in paraffin wax. Ten-µm sections were cut and stained with hematoxylin and eosin (H&E; Thermo Shandon, 15275, USA).

Livers were scored for microscopic hepatocellular changes and degeneration as follows:

Degree 1 (mild): mild hepatocellular swelling due to hydropic degeneration and fatty changes only in centrilobular areas.

Degree 2 (moderate): clear hepatocellular swelling and changes in both centrilobular and midzonal areas.

Degree 3 (severe): dispersed and severe hepatocellular swelling and changes in other areas (this grade was not observed in any treatment).

The remaining broilers in each group were used to evaluate growth performance and immunological variables. The results have been published elsewhere (Mogadam and Azizpour, 2011).

Ethical considerations

The experiment procedures were approved by the Commission of Ethics and Animal Welfare of the Islamic Azad University under protocol number 1235.

Statistical analysis

The experiment was analyzed according to a completely randomized design with 10 dietary treatments with three replicates of 10 birds each. Data were subjected to statistical analysis using the general linear models procedure of SAS software (SAS, 1996). Treatment means showing significant differences in the one-way analysis of variance were compared using Duncan's multiple-range test. Histopathological lesions were compared among treatment groups by the chi-square test. All the statements of significance were based on 0.05 probability level.

RESULTS

Serum biochemistry

The effects of the dietary treatments on serum biochemical parameters are presented in Table 1. Feeding aflatoxin alone caused significant reduction in uric acid (52.4%) and triglyceride (54.22%) levels, and significantly increased AST (32.96%) and ALT (34.82%) activities (p<0.05) compared with the control group. Total cholesterol (29.75%) level of the group fed only with aflatoxin was not statistically different (p>0.05) from the control group.

Table 1
Effect of aflatoxin-contaminated diet, sodium bentonite (SB) and yeast glucomannan (YG) on serum biochemical parameters and relative liver weight in broiler chicks fed aflatoxin contaminated feed from 7 to 42 days of age.

Treatments*	42 days of age
	Uric acid (mg/dl)	Cholesterol (mg/dl)	Triglyceride (mg/dl)	AST (iu/l)	ALT (iu/l)	Relative liver weight(g)
1	7.68±2.20a	165.16±1.75	159.09±44.85a	241.82±32.92b	38.25±2.52b	2.3±1.2c
2	3.65±0.27b	116.02±8.79	72.83±58.80c	321.53±25.24a	53.10±7.95a	5.1±1.3a
3	4.08±1.36b	140.83±10.72	98.07±10.03bc	309.93±34.05ab	47.92±5.64ab	4.2±0.8ab
4	3.98±2.20b	132.42±14.48	79.50±26.90c	303.27±29.93ab	48.17±3.34ab	4.5±0.7ab
5	4.30±0.54ab	147.11±9.56	81.16±5.75c	305.39±40.72ab	44.13±6.45ab	3.5±0.9bc
6	6.35±0.60a	175.93±9.45	144.89±29.20a	265.42±18.63b	41.72±1.98b	2.9±.0.5c
7	4.24±0.44ab	131.16±3.40	91.81±14.64bc	306.63±52.48ab	45.49±7.20ab	4.3±1.1ab
8	4.12±0.52b	142.50±6.26	83.63±21.86bc	307.91±60.04ab	46.65±4.35ab	4.4±1.2ab
9	4.36±0.47ab	143.16±17.92	82.05±12.21bc	301.60±72.83ab	46.12±9.43ab	3.7±1.4abc
10	4.68±2.05ab	141.92±13.32	119.71±20.25ab	294.52±81.46ab	43.32±8.16ab	3.5±1.1bc
Sig.	**	NS	**	**	**	**

• a-b: means presented in a column with different superscripts differ significantly (p<0.05) .*1) Positive control diet, basal diet without additive(control); 2) Negative control diet, diet naturally contaminated with aflatoxin (NCD); 3) NCD supplemented with 1.5% SB; 4) NCD supplemented with 3% SB; 5) NCD supplemented with 0.05% YG; 6) NCD supplemented with 0.1% YG ; 7) NCD supplemented with 1.5% SB+ 0.05% YG ; 8) NCD supplemented with 1.5% SB+ 0.1 % YG ; 9) NCD supplemented with 3% SB + 0.05% YG; and 10) NCD supplemented with 3% SB+ 0.1% YG.SB = sodium bentonite . YG = Yeast Glucomannan.NS = Not significant, ** (p<0.05).

The addition of YG (0.1%) alone to the aflatoxin-containing diet (250 ppb; group 6) significantly alleviated the adverse effects of aflatoxin on uric acid and triglyceride serum levels, AST and ALT activities, and liver relative weight (p<0.05). The other adsorbent treatments (groups 3, 4, 5, 7, 8, 9, 10) tended to promote only partial amelioration of the parameters negatively affected by the aflatoxin treatment (p>0.05).

Liver pathological changes

The aflatoxin-contaminated diet caused a significant increase (p<0.05) in liver relative weight compared with the non-contaminated diet (5.1vs. 2.3; 121.7%).

No significant microscopic lesions were observed in liver tissue of the control birds (Table 2). The number of birds fed the aflatoxin-contaminated diet presenting liver damage was significantly higher (p<0.05) compared with the positive control group. The lesions included slight to moderate hydropic degeneration and fatty vacuoles in hepatocytes in centrilobular and midzonal areas (8 of 10 cases; Fig. 1). In this group, bile duct proliferation (7 of 10 cases) was observed in the portal areas (Fig. 2), as well as periportal fibrosis (5 of 10 cases), cell infiltration (4 of 10 cases;Fig. 3), and a slight hyperemia (3 of 10 cases). There were also histopathological changes (slight to moderate) in the livers of birds submitted to the other treatments.

Table 2
Effect of aflatoxin-contaminated diet, sodium bentonite (SB) and yeast glucomannan (YG) on microscopic changes of liver in broiler chicks fed aflatoxin contaminated feed from 7 to 42 days of age

Changes/lesions	Treatments*
	1	2	3	4	5	6	7	8	9	10
Hydropic degeneration and/or fatty changes	0/10b	8/10a	8/10a	7/10a	4/10ab	3/10b	6/10a	7/10a	7/10a	4/10ab
Bile-duct hyperplasia	0/10b	7/10a	4/10a	5/10ab	1/10b	0/10b	5/10a	4/10ab	4/10ab	2/10b
Periportal fibrosis	0/10b	5/10a	4/10 a	3/10ab	0/10b	0/10b	3/10ab	3/10ab	2/10b	1/10b
Cell infiltration	0/10b	4/10a	2/10ab	2/10ab	0/10b	0/10b	2/10ab	1/10b	2/10ab		0/10b
Hyperemia	0/10a	3/10a	2/10a	1/10a	0/10a	0/10a	2/10a	0/10a	0/10a		0/10a

• ^ab ;Different superscripts in the same row indicate significant difference (p <0.05) among treatments for each parameter.

The values represent the number of chicks showing histopathological changes/number of chicks examined in each treatment group.*1) Positive control diet, basal diet without additive (control); 2) Negative control diet, diet naturally contaminated with aflatoxin (NCD); 3) NCD supplemented with 1.5% SB; 4) NCD supplemented with 3% SB; 5) NCD supplemented with 0.05% YG; 6) NCD supplemented with 0.1% YG ; 7) NCD supplemented with 1.5% SB+ 0.05% YG ; 8) NCD supplemented with 1.5% SB+ 0.1 % YG ; 9) NCD supplemented with 3% SB + 0.05% YG; and 10) NCD supplemented with 3% SB+ 0.1% YG.SB = sodium bentonite . YG = Yeast Glucomannan.NS = Not significant, ** (p<0.05).

The addition of YG alone (groups 5 and 6) and YG+SB (group 10) to the aflatoxin-contaminated diet significantly reduced the number of affected broilers and/or the severity of lesions (Table 2). The reduction in the severity of hydropic degeneration and other liver changes was considerable. Liver relative weight was also recovered by YG (0.05 and 0.1%) and YG (0.1%)+SB (3%) treatments (groups 5, 6 and 10; p<0.05). Treatment 6 (0.1% YG) presented the mildest histopathological lesions (slight hydropic degeneration) relative to the other treatments, except relative to the positive control group.

Fig 1
Histological section of the liver of a bird of the 250 ppb aflatoxin -treated group showing marked fatty changes and moderate hydropic degeneration in hepatocytes (H & E×300).

Fig 2
Liver of a bird of the 250 ppb aflatoxin -treated group, showing bile-duct hyperplasia (H & E×300).

Fig 3
Liver of a bird of the 250 ppb aflatoxin-treated group, showing mononuclear cell infiltration in the portal triad and connective tissue increase (H & E×300).

DISCUSSION

Due to their high toxicity and frequency of occurrence in feedstuffs, aflatoxin is an important issue in the poultry industry. Aflatoxin-contaminated feed reduces the activities of several enzymes that are important for the digestion of carbohydrates, proteins, lipids, and nucleic acids in broilers (Oguz et al., 2011). Chronic and sub-clinical aflatoxicosis cases can be diagnosed by determining changes in serum biochemistry and hematological parameters before clinical symptoms become apparent. These parameters are sensitive indicators of aflatoxicosis (Kececi et al., 1998).

The biochemical and hematological toxic effects of aflatoxin have been well-investigated and are well-known. Some of the previously described biochemical toxic effects of aflatoxin were clearly seen in present study. Lower uric acid, cholesterol, and triglyceride serum levels, and higher AST and ALT activities were detected in the broilers fed the aflatoxin-contaminated diet with no adsorbents (negative control group) compared with the positive control feed, in agreement with previous reports on the biochemical toxic effects of aflatoxin (Raju & Devegowda, 2000; Basmacioglu et al., 2005; Mohamed & Mohamed, 2009; Magnoli et al., 2011). The higher AST and ALT activities and reduced cholesterol and triglyceride values observed in the group fed the contaminated diet are a result of hepatic damage and leakage of enzymes in the bloodstream, as well as of impaired carbohydrate and lipid metabolism (Rosa et al., 2001; Mohamed & Mohamed, 2009).

The gross and histopathological effects of aflatoxin on poultry are well-researched (Ortatatli & Oguz, 2001). Our aim was to evaluate the impact of 250 ppb aflatoxin, a level that has been shown to occur under field conditions, on pathological changes of the liver.

The liver is considered the primary target organ of aflatoxin (Ortatatli et al., 2005), and therefore, the livers of broilers were examined in the present study to determine if any pathological changes were present. In poultry, liver relative weight is increased by lower levels of aflatoxin more than that of other organs (Ortatatli & Oguz, 2001). Hepatomegaly, hydropic and fatty changes, and acinar arrangements in hepatocytes, periportal fibrosis, and bile duct proliferation were detected in the present study, in agreement with previous findings (Karaman et al., 2005; Bintvihok, 2010). In the present study, liver relative weight was significantly higher in the negative control group compared with positive control group.

Removing aflatoxin from contaminated feeds and feedstuffs is still a major problem and there is a desperate need for efficient decontamination technologies (Oguz 2012; Rosaet al., 2012). An approach to the problem is the addition of non-nutritive and inert adsorbents and biological compounds produced by microorganisms, like bacteria or yeasts, to the diet to bind aflatoxin and to reduce its absorption in the gastrointestinal tract. In order to be effective, these compounds must not be absorbed in the gastrointestinal tract. They should also have the ability to physically bind to chemical substances, preventing their absorption (Che et al., 2011). In this study, YG and SB were selected as adsorbents for reducing aflatoxin absorption in the gastrointestinal tract and alleviating serum biochemical changes and lesions caused by the exposure to aflatoxin (250 ppb).

Several experiments evaluated the efficacy of the addition of YG and/or SB to aflatoxin-contaminated diets to alleviate the effects of aflatoxin toxicity on the performance, hematological, serum biochemistry, immune, and gross and histopathological changes of broilers (Aravindet al., 2003; Karaman et al., 2005; Ghahri et al., 2009; Magnoli et al., 2011; Rosa et al., 2012) and ducklings (Banlunara et al., 2005; Bintvihok, 2010). In most of the mentioned studies, YG and SB were added to diets contaminated with different levels of aflatoxin (200 to 2000 ppb). The present experiment was conducted to evaluate the effects of SB and YG (Mycosorb) in a diet naturally contaminated with 250 ppb aflatoxin, which is considered as the level commonly present in field conditions.

When compared with the negative control group, the addition of 0.1% YG alone to the aflatoxin-contaminated diet (250 ppb; group 6) significantly reduced the adverse effects of aflatoxin on AST and ALT activities and on liver relative weight, as well as the number of broilers affected and/or the severity of liver lesions. The other adsorbent treatments (groups 3, 4, 5, 7, 8, 9, 10) provided partial, but not statistically significant amelioration of the parameters influenced by the aflatoxin treatment. This means that the values of the biochemical and histopathological parameters obtained in these groups were intermediate between the positive and negative control groups. These effects may depend on the amount of aflatoxin molecules adsorbed in the gastrointestinal tract by the feed additives. It is predicted that, when more aflatoxin molecules are adsorbed by feed additives in the gastrointestinal tract, there are less negative effects on the target organs and blood biochemistry. These findings are in agreement with other studies reporting significant improvements with addition of YG in mold-contaminated diets (Aravind et al., 2003; Girish & Devegowda, 2006; Che et al., 2011).

The effectiveness of YG to adsorb aflatoxin molecules in the gastrointestinal tract was clearly shown in our study, as predicted. The adsorbing effects of dietary YG are attributed to its ability to selectively bind to aflatoxin molecules. The cell wall of S. cerevisiae consists of a network of b-1,3 glucan backbone with b-1,6 glucan side chains, which in turn are attached to highly glycosylated mannan proteins, which make the external layer. The proteins and glucans provide numerous easily accessible binding sites with different binding mechanisms, such as hydrogen bonds, and ionic or hydrophobic interactions. The binding of aflatoxin to the yeast cell surface was reported earlier and it is attributed to cell wall glucans (Shetty et al., 2007; Guan et al., 2011).

When compared with negative control diet, the detoxifying efficacy of the inclusion of 1.5% and 3% SB in the aflatoxin-contaminated diet was not significant (groups 3, 4), in contrast with studies reporting significant amelioration of symptoms and lesions with the addition of SB (Eraslan et al., 2004; Miazzo et al., 2005; Magnoliet al., 2011) to diets containing aflatoxins (200 to 2500 ppb). The beneficial effects of SB in the aforementioned studies may be attributed to its sequestering action, i.e., it adsorbs aflatoxins, reducing their bioavailability in the gastrointestinal tract. The differences between our results and these findings may be due to differences in sodium bentonite or aflatoxin levels in the feeds or to poultry species.

In a previous work (Mogadam & Azizpour, 2011), we evaluated the toxic effects of aflatoxin (250 ppb) and the efficiency of dietary Mycosorb and SB addition to alleviate those effects on broiler performance and antibody production against Newcastle disease using the under the same experimental design as the present study. The amelioration of serum biochemical values and liver changes obtained with the diet contaminated with aflatoxin and with 0.1% YG addition in the present study is consistent with the findings of that study, in which 0.1% YG proved to be effective for reducing the negative effects of aflatoxin on the performance and humoral immunity against ND.

CONCLUSION

The supply of the aflatoxin-contaminated diet (250ppb) significantly and negatively affected serum biochemical parameters and liver pathological changes of broilers. The addition of YG and SB, individually and in combination, to the aflatoxin-contaminated diet counteracted the negative effects of aflatoxin, but the supplementation to the aflatoxin-contaminated diet with 0.1% YG alone was much more effective than other treatments in ameliorating the adverse effects of aflatoxin on serum biochemical parameters and liver pathological changes.

ACKNOWLEDGMENTS

The authors are thankful to Dr.H. Ghahri from Islamic Azad University, Urmia, Iran for his technical help and Dr. AA. Farshid from Urmia University, Urmia, Iran for kindly providing Figures. The authors gratefully acknowledge the assistance of Prof. H. Oguz from Selcuk University, Campus, Konya, Turkey for reviewing of the manuscript.

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Publication Dates

• Publication in this collection
  Oct-Dec 2015

History

• Received
  Oct 2014
• Accepted
  Apr 2015