CC BY
02021, Scienceline Publication
World's Veterinary Journal
World Vet J, 11(1): 29-36, March 25, 2021
DOI: https://dx.doi.org/10.54203/scil.2021.wvj4
Growth Performance and Health Status of Broiler Chickens Treated with Natural Kaolin
Somayia ElHag1, Ali Abdel Motelib1, Mosaad A. Soltan2* and Mohamed Abdel Gawad1
1 Geology Department, Faculty of Science, Cairo University, Egypt
2 Nutrition and Veterinary Clinical Nutrition Department, Faculty of Veterinary Medicine, Alexandria University, Egypt Corresponding author's Email: soltanmosaad@yalioo.com; : 0000-0002-7710-5631
ABSTRACT
The use of Kaolin as an inert ingredient in feed has been very common in the poultry industry. The present study aimed to investigate the effects of different inclusion rates of Egyptian kaolinite in broiler chickens' diet on growth performance, immune response, some blood serum changes, and bone development. A total of 240 unsexed one-day-old Avian 48 breed chickens were used in this experiment. The chickens were individually weighed and randomly allotted into 3 equal groups (80 chickens per each group) and each group was subdivided into 4 replicates (20 chickens per replicate), which received one of the three experimental diets (0.0, 0.5, and 1.0% kaolin for groups 1, 2, and 3, respectively) during the experimental period (6 weeks). The obtained data revealed that kaolin addition at the dose of 0.5 or 1.0% in broiler chickens' diet insignificantly increased final body weight by 4.5% and 4.4 %, respectively. On the other hand, it respectively decreased total feed intake by 1.0% and 1.8% and significantly improved the average feed conversion ratio and efficiency of energy utilization throughout the whole experimental period compared to the control. Moreover, kaolin addition had no adverse effect on the serum lipid profile and improved antioxidative activity through reduced nitric oxide and lipid peroxidase (malondialdehyde) concentrations or increased the activities of Glutathione peroxide, Catalase, and Superoxide dismutases in serum or liver tissues. Lysosomal and bactericidal activities were increased with kaolin addition at both levels in the broiler chickens' diets. The present results suggested that the broiler chickens' fed with kaolin-enriched diets improved growth, antioxidant activity, bone mineralization, and immune response.
Keywords: Antioxidant activity, Broiler chicken, Growth performance, Kaolin, Silicification, Strength INTRODUCTION
Presently, general knowledge reveals that feed constitutes the highest and the most expensive input in any livestock especially poultry farms (Owen et al., 2010). Any major reduction or decrease in the cost of feed will extensively reduce the overall cost of production and increase the profit margin of the farm. In general, antibiotics are used in poultry feed to control infectious diseases, but they lead to drug resistance of microbes, which has led to many human health and environmental problems (Castanon, 2007).
As an additive, the natural clays have become a new line of an alternative to antibiotics and chemotherapeutics in the effective prevention of diseases (Ghosal, 1990). Clay minerals are mainly defined as hydrous layer aluminosilicates and it has some unique properties, which includes the high cation exchange capacities, the catalytic properties, and the plastic behavior when getting moist. Structures of clay minerals are mainly formed from a tetrahedral and octahedral sheet when they are combined into groups, and can be differentiated by the kinds of isomorphic action substitution (Moore and Reynolds, 1997). In systematic mineralogy, the kaolin known as a thin clay was white in color and was created by the weathering of aluminous minerals, such as feldspar, a plastic clay mineral. It was classified as a phyllosilicate group because of its absorption capacity and the absence of primary toxicity (Owen et al., 2012). Mechanical erosion created the rock under the tropical climate and at the increased temperatures and the chemical corrosion happened under the activity of water saturated with CO2 and humic acids which eluted from water (Bernard and Rost, 1992; Slivka, 2002). Kaolinite is a clay mineral with the chemical composition of Al2Si2O5(OH)4. It has a low cation exchange capacity and usually absorbs water and forms a plastic, paste-like substance (Duda et al., 1990; Trckova et al., 2004). Kaolin as an inert ingredient has been used in poultry diets for the improvement of growth performance and alleviation of the adverse effects of mycotoxins (Safaeikatouli et al., 2011).
The current substance was used to promote the reduction of toxins that cause injuries to the intestinal epithelium, by the absorption and excretion of the pathogen thereby protecting the intestinal mucosa and improving the performance of the poultry (Trckova et al., 2009; Owen et al., 2012). Similar data in the previously published articles for improvement in broiler chickens' performance were shown upon supplementing diets with kaolin, bentonite, zeolite (Katouli et al., 2010), clay (Ani et al., 2014), and kaolin (Jorge de Lemos et al., 2015). Wu et al. (2013) showed that adding clinoptilolite to diets improved antioxidant capacity in broiler chickens as evidenced by increasing glutathione
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peroxidase, catalase, and total superoxide dismutase activities as well as decreasing malondialdehyde content of the liver. Adamis et al. (2005) discussed the adverse effect of using mineral silicate in the diet of poultry and livestock on their health, yield, and consumers. It is well established that the health and performance of birds are influenced by the nutrient and metabolites of blood. Therefore, the current study was designed to investigate the effects of different levels of Kaolin on the parameters of growth performance and health status of broiler chickens.
MATERIALS AND METHODS
Ethical approval
The present study was accepted by the animal ethics committee in Cairo University, Egypt, under the registration number (CU-I-F-49-18).
Chickens management and experimental design
A total of 240 unsexed one-day-old Avian 48 breed chickens were used in this experiment. The chickens were individually weighed and randomly allotted into 3 equal groups (80 chickens per each) and each group was subdivided into 4 replicates (20 chickens per each). The chicks were housed in a clean and well-ventilated room (side extraction systems, which removed air through the sides of the housing), previously disinfected with formalin (one part of formalin to 49 parts of water). The room was supplied with electric heaters to adapt to the environmental temperature according to the age of the chickens (Cobb-Vantress, 2008). Feeds and water were provided ad-libitum (using galvanized poultry feeder and inverted plastic drinker). Neomycin sulphate, clostin sulphate, spectinomycin, and cephadrin were used in the drinking water as prophylactic against the most common infectious diseases (Abeer et al., 2019)
The broiler chickens were randomly allotted into 3 groups; each group (80 chickens per group) received one of the three experimental diets (0.0, 0.5, and kaolin 1.0% for groups 1, 2, and 3, respectively) during the experimental period (6 weeks). A basal diet formulated to meet the requirements of broiler chickens as recommended by Cobb-Vantress (2008). According to AOAC (1990), different proportions of ingredients to meet the requirements at different production periods and chemical analysis of the basal diets are presented in Table1.
Measurements
Body weight development, body weight gains, and feed intake of broiler chickens in different groups were weekly recorded. Feed Conversion Ratio (FCR), Protein Efficiency Ratio (PER), Efficiency of Energy Utilization (EEU) and Performance Index (PI) were calculated according to Crampton and Loyd (1959), Lambert et al. (1936), McDonald et al. (1987) and North (1981) respectively.
Concentrations of blood serum lipids
These parameters included serum total lipids, total cholesterol, serum high-density lipoprotein (HDL-cholesterol), serum low-density lipoprotein (LDL-cholesterol), and serum triglyceride. These parameters were respectively estimated according to Sidney and Barnard (1973), Allain et al. (1974), Lopes-Virella et al. (1977), and Assmann et al. (1984) using commercial kits produced by Biodiagnostic (Diagnostic and Research reagents). Serum VLDL-cholesterol was calculated by subtraction according to the following equation: VLDL-cholesterol: Total cholesterol - (HDL-cholesterol + LDL-cholesterol).
Antioxidant enzymes
These included serum Catalase (CAT), Superoxide dismutases (SODs), Glutathione peroxide (GPx) and lipid peroxidase (Malondialdehyde MDA). These antioxidant enzymes' activities were estimated according to Aebi (1984), Nishikimi et al. (1972), Paglia and Valentine (1967), and Satoh (1978) using commercial kits produced by Biodiagnostic (Diagnostic and Research reagents).
Evaluation of the immune response
The immune response of the chickens was estimated by lysosome activity and bactericidal activity.
Lysosome activity
Serum lysosome activity was measured with the turbid metric method described by Engstad et al. (1992); using 0.2 mg/ml lyophilized Micrococcus lysodekticus as the substrate in phosphate buffer adjusted to pH 5.75. Fifty microliters of serum were added to 3 ml of the bacterial suspension. The 540 nm absorbance was measured by spectrophotometer after-mixture (Ao) and after incubation at 37°C (A) for 30 minutes. The result expressed as one unit of lysosome activity was defined as a reduction in the absorbency of 0.001/min. (Lysosome activity, (A0-A)/A).
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Bactericidal activity
Serum bactericidal activity was determined by using 300 ^l of Aeromonas hydrophila suspension (1.5 x 103 cells/ml), and 300 ^l of fresh serum was mixed in sterile tubes according to Rainger and Rowley (1993). A blank consisted of 300 ^l of bacterial suspension and 300 ^l of sterile Phosphate Buffer Solution. The tubes were incubated at 28 oC. Fifty ^l of the sample was removed at 0, 1h, 2h, 3h, and 4h, and different dilutions were plated on nutrient agar for 24 h at 28°C, and then Colony Forming Units (CFU) were counted. The results were calculated as survival index (SI) (Wardlaw and Unkles, 1978). Values were calculated as follows: SI: CFU at the end / CFU at the start x100.
Fourier transform infrared spectroscopy techniques
It was one of the analytical techniques that had been previously used to gather information on the composition and crystallinity of the bone mineral (Fook and Guastaldi, 2005; Petra et al., 2005; Fuchs et al., 2008; Nagy et al., 2008). Collected bone samples were prepared in accordance with Greene et al. (2004). The sample was grounded to a fine powder with an agate mortar and pestle. Fourier Transform Infrared Spectroscopy (FTIR) grade potassium bromide (97-99 mg) was ground to a fine powder in a separate agate mortar and pestle. The two powders (100 mg total) were then combined and mixed with a spatula. An additional 100 mg of potassium bromide (KBr) was ground into a fine powder, and then it was used to obtain background spectra. The sample was transferred into a sample cup for overflowing, and a coverslip was dragged across the top of the cup to remove excess powder and smoothed the sample surface to maintain uniform distribution of particle size. Each sample was then mixed with KBr and placed in a Diffuse Reflectance Fourier Transform Infrared Spectroscopy Techniques cell. Absorbance infrared spectra were obtained between 4000 cm-1 and 400 cm-1 wave number. This method of analysis gives information on the composition and crystallinity of the bone mineral, and at the same time indicates the behavior of the protein materials in bones.
Statistical analysis
Obtained data were subjected to one-way ANOVA to study the effect of different treatments on the different studied variables (body weight, feed utilization parameters, serum lipids, oxidative index and antioxidant enzymes and immune response items) using Statistical Analysis System (SAS, 1996) to assess significant differences using Honestly Significant Difference (HSD) t test. The obtained data were presented as mean ± standard error of mean (SE) and significance was considered at P < 0.05.
Table 1. Ingredient and chemical composition of the basal diets used for broiler chickens feeding during different experimental periods.
Feed Type Feed Type
Ingredients Starter Grower Starter Starter Grower Starter
diet diet diet diet diet diet
Ingredient (kg/ton) Chemical composition%
Yellow corn 580 647 675 Crude protein 23.0 21.0 19.0
Corn gluten (60%) 18.5 31.5 15.5 ME (Kcal/kg diet) 3010 3100 3200
Soybean meal (44%) 348 272 248 Calcium 1.0 0.9 0.85
Limestone 2.5 18 17 Available phosphors 0.5 0.45 0.42
Mono calcium phosphate 11.5 9.5 8.3 Crude fiber 2.3 2.4 2.4
Vegetable oil1 5 5 20 Ether extract 2.6 2.8 2.9
Premix 2 3 3 3 Chloride 0.2 0.18 0.19
Lysine3 2.5 3.6 2.5 Sodium 0.16 0.16 0.16
DL-Methionine4 2.3 2.4 2.3 Lysine 1.4 1.3 1.1
Salt 2.5 2.5 2.5 Methionine 0.62 0.62 0.56
Sodium bicarbonate 2 2 2
Mycotoxin binder 0.5 0.5 0.5
Phytase enzyme 0.1 0.1 0.1
Enzyme mixture 0.5 0.5 0.5
De-cocox 0.5 0.5 0.5
Lincomix 0.1 0.1 0.1
1Vegetable oil (mixture of sunflower oil and cottonseed oil). 2The premix used was Heromix produced by Heropharm and composed of (per 1.5 kg) vitamin A 12000000 IU, vitamin D3 2500000 IU, vitamin E 10000 mg, vitamin K3 2000 mg, thiamin 1000 mg, riboflavin 5000 mg, pyridoxine 1500 mg, cyanocobalamine 10 mg, niacin 30000 mg, biotin 50 mg, folic acid 1000 mg, pantothenic acid. 3Lysine: lysine hydrochloride (contain 98.5% Lysine). 4DL-Methionine (Produced by Evonic Company and contains 99.5% methionine).
RESULTS
Growth performance
As shown in Table 2, the addition of 0.5 or 1.0% kaolin in the broiler chicken diet increased non-significantly (P > 0.05) final body weight and total gain by 4.5% and 4.7% and 4.4% and 4.5%, respectively compared with the control group. On the other hand, it was found that kaolin addition at 0.5 or 1.0% decreased TFI by 1.0% and 1.8% and
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significantly (P < 0.05) improved average FCR and EEU consequently throughout the whole experimental period by (5.4% and 5.4%) and (5.9% and 6.2%) respectively compared to the control group, while non-significantly (P > 0.05) improved average protein efficiency ratio (PER) and performance index (PI) compared to the control group.
Blood serum lipid profile
The effect of kaolin addition in broilers' diet on serum lipid profile is presented in Table 3. It was observed that kaolin supplementation at the dose of 5 or 10g/kg in the diet non-significantly (P > 0.05) increased blood serum total lipids and triglycerides concentrations by 0.8% -0. 25% and 5.9%-1.6%, respectively, compared to the control group. On the other hand, kaolin supplementation at the dose of 5 or 10g/kg in the diet significantly (P < 0.05) increased serum HDL concentration, while had no clear effect on serum cholesterol (CHO), LDL, and VLDL concentrations compared to the control group.
Oxidative index and antioxidant enzymes activities
The data of serum and liver oxidative marker and antioxidant enzyme activities are presented in tables 4 and 5, respectively. Kaolin addition at the dose of 5g/kg in the broilers' diet significantly (P < 0.05) reduced nitric oxide concentration in blood serum and liver tissues while higher inclusion level non-significantly (P > 0.05) reduced nitric oxide concentration compared to the control group. Moreover, both inclusion levels (5 or 10g/Kg diet) of kaolin non-significantly (P > 0.05) reduced the activity of MDA in blood serum and liver tissues, compared to the control group. Regarding antioxidant enzyme activities, it was observed that kaolin addition at the concentrations of 5 or 10g/kg in the broiler chickens diet increased the activities of GPx, SOD, and CAT in both serum and liver tissues, compared to the control group. Moreover, kaolin addition at 10g/kg was more effective on serum antioxidant enzyme activities, compared to a lower kaolin addition.
Immune response
As shown in Table 6, kaolin addition at the concentration of 0.5 or 1.0% in the broiler chickens' diet non-significantly (P > 0.05) improved bactericidal and lysosome activities by 3.9-39.3% and 5.4-14.3%, respectively, compared to the control group.
Fourier Transform Infrared Spectroscopy
Data about the FTIR spectra of all samples are recorded in Figure 1. All spectra of samples differed from the control sample and provide information regarding the effect of feed additives on the investigated bones.
The results of FTIR indicated a similarity in groups fed on the basal diet supplemented by 10g kaolin/kg diet, compared to the control group. The results showed that mineralization and silicification started in the bone of the broiler chicken group fed on the basal diet with 5 g kaolin/kg diet.
Table 2. Effects of different dietary kaolin supplementation on the growth performance and feed efficiency parameters of broiler chickens
Parameters Dietary kaolin supplementation
Control (0.0%) 0.5% 1.0%
Initial weight (g/chicken) Final weight (g/chicken) Total gain (g/chicken) Total feed intake (TFI g/chicken) Average FCR1 Average PER2 Average EEU3 Average PI4 40.55±0.23a 1864.47±35.95a 1824.05±35.88a 3625.00 2.02±0.05a 2.46±0.05a 6.25±0.16a 95.24±3.36a 40.38±0.25a 40.43±0.27a 1949.23±36.99a 1946.76±37.65a 1908.90±36.83a 1906.54±37.49a 3587.5 3560.00 1.91±0.04b 1.90±0.04b 2.60±0.05a 2.61±0.05a 5.91±0.13b 5.86±0.13b 105.17±3.78a 105.69±3.99a
Values are means ± standard error. conversion ratio. Average PER2: performance index. Means within the same row of different litters are significantly different at P < 0.05. Average FCR1: Average feed average protein efficiency ratio. Average EEU3: average efficiency of energy utilization. Average PI4: average
Table 3. Effects of different dietary kaolin supplementation on serum lipids profile of broiler chickens
Parameters Dietary kaolin supplementation
Control (0.0%) 0.5% 1.0%
Total lipids (mg/dl) Triglycerides (mg/dl) CHO (mg/dl)1 HDL (mg/dl)2 LDL (mg/dl)3 VLDL (mg/dl)4 901.97±26.88a 218.59±2.88a 195.28±2.43a 51.22±1.61b 100.34±1.94a 43.72±0.58a 909.47±3.53a 219.13±4.31a 194.03±0.92a 54.33±1.56a 96.47±1.75a 43.23±0.86a 955.55±5.72a 222.19±4.25a 194.78±1.71a 55.43±2.21a 94.91±1.68a 44.45±0.84a
Values are means ± standard error. Means within the same row of different litters are significantly different at P < 0.05. CHO1: total cholesterol. HDL2: high-density lipoprotein, LDL3: low-density lipoprotein. VLDL4= very low-density lipoprotein.
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Table 4. Effects of different dietary kaolin supplementation on some serum and liver tissue oxidative index activities of broiler chickens
Parameters Dietary kaolin supplementation
Control (0.0%) 0.5% 1.0%
Blood serum
Nitric oxide (umol/L) 55.58±0.71a 50.74±0.27b 54.89±0.62a
MDA (nmol/ml)* 11.76±0.69a 10.89±0.48a 10.65±1.15a
Liver tissues
Nitric oxide (umol/g) 50.58±0.32a 46.55±0.40b 49.69±1.03ab
MDA (nmol/g) 10.12±0.60a 9.76±0.65a 9.75±0.40a
Values are means ± standard error. Means within the same row of different litters are significantly different at P < 0.05. * MDA: Lipid peroxide (Malondialdehyde)
Table 5. The effects of different dietary kaolin supplementation on some serum and liver tissue antioxidant enzyme activities of broiler chickens.
Parameters Dietary kaolin supplementation
Control (0.0%) 0.5% 1.0%
Blood serum
GPx (mu/ml)1 35.69±0.57b 38.47±0.35a 38.35±0.87a
SOD (U/ml)2 282.82±50.06a 320.30±27.17a 320.51±25.64a
CAT (U/L)3 26.45±8.96b 38.79±0.64b 56.85±4.34a
Liver tissues
GPx (U/g) 38.90±10.71a 43.86±2.48a 44.60±7.08a
SOD (U/g) 282.17±24.22a 354.33±62.07a 331.03±63.25a
CAT (U/g) 0.13±0.01a 0.16±0.02a 0.15±0.01a
Values are means ± standard error. Means within the same row of different litters are significantly different at P < 0.05. GPx1: Glutathione peroxide. SOD2: Superoxide dismutases. CAT3: Catalase.
Table 6. The effects of different dietary kaolin supplementation on bactericidal and lysosome activity of broiler chickens.
Parameters Dietary kaolin supplementation
Control (0.0%) 0.5% 1.0%
Bactericidal activity (survival index %) 32.07±2.18a 30.79±2.43a 30.33±2.58a
RTC* 100 96.01 94.6
Lysosome (unit/ml) 0.28±0.02a 0.39±0.03a 0.32±0.02a
RTC* 100 139.3 114.3
Values are means ± standard error. Means within the same row of different litters are significantly different at (P <0.05). RTC*: Relative to control.
Figure 1. Fourier Transform Infrared Spectroscopy (FTIR) showing the difference between the control and the groups fed with 5 kg and 10kg of kaolin/ton of the diet. Red line represents FTIR result of FTIR for the control group which had no additions in the diet, Black line represents the result of FTIR for the group B which took 5 kg of kaolin per ton of ration, and green one represents the result of FTIR for the group A which took 10 kg of kaolin per ton of ration. samples were taken at age of the 42 days.
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DISCUSSION
Generally, the growth performance and feed utilization parameters were considered an important index in poultry studies. It has been reported that dietary supplementation with kaolin improved enzymatic activity of the gastrointestinal secretion (Ouhida et al., 2000; Alzueta et al., 2002). The improvement of growth performance and better feed efficiency parameters of broiler chickens' groups fed with kaolin-containing diets may be related to enhancing nutrients digestibility and absorption through increasing enzyme secretion and intestinal health. Moreover, it was found that kaolin at both concentrations in broiler chickens' diets significantly reduced feed intake, compared to the control group, which may be related to the high reduction of digest transit rate and improvement of digestion (Angulo et al., 1995). Results of previous experiments on the effects of clay on broiler performance were generally inconsistent (Ouhida et al., 2000). The feeding values of clays are known to be affected by the kind of clays, producing area, grade, and their physicochemical and structural characteristics. The present study agreed with the findings of Xia et al. (2004), Parizadian et al. (2013), and Jorge de Lemos et al. (2015).
The obtained results of serum lipid profile were in the normal range and the results of the present study were in agreement with previous findings (Miles and Henry, 2007; Safaeikatouli et al., 2011; Emam et al., 2019). Numerical reduction of serum cholesterol in broiler chickens gave kaolin in the diet is consistent with the specific inhibition of hepatic cholesterol biosynthesis (Kato et al., 1969).
Nitric oxide (NO) is a poisonous, unstable free radical gas that has been known for years to be a constituent of air pollutant and is involved in the depletion of the ozone layer. However, nitric oxide is produced by all types of body cells (Mayer and Hemmens, 1997) and is considered the most important molecule for blood vessel health and neuronal communication (Schmidt and Walter, 1994). On the other hand, when it is produced in large excess or produced with reactive oxygen species (ROS) con-currently, Nitric oxide (NO) also displays neurotoxicity and it can induce apoptotic cell death in different types of neuronal cells. Lower NO in serum or liver tissues of the broiler chicken fed on kaolin supplemented ration indicated that the zeolites show the ability to bind NO, 4-hydroxy-noneal, and oxygen which may also have an antioxidative effect (Sverko et al., 2004). The present data were in agreement with Wu et al. (2013) stating that the activity of total nitric oxide synthase was significantly (P < 0.05) decreased in 2 % natural clinoptilolite, and it modified the clinoptilolite group than the control group.
Free radicals can generate ROS in cells. It can contribute to cell and tissue damage in the living body. The ability of a cell to keep functional homeostasis depends on the fast induction of protective antioxidant enzymes. The antioxidants may prevent these damages induced by oxidation of protein and lipid. The antioxidant enzymes include GPx, SOD, and CAT. These are the three main antioxidant enzymes in the body, which remove unwanted ^O2-, ROOH, hydrogen peroxide (H2O2), and the ones produced by free radicals. The concentrations of SOD, CAT, or GPx play an important role in protecting cells against the oxidative stress (Ermak and Davies, 2002). Decreased activity of these enzymes will induce increased free radicals and then will lead to damage of the corresponding tissue. Malondialdehyde (MDA) is an ending product of lipid peroxidation, so the amounts of MDA could be used to assess the extent of lipid peroxidation (Satoshi et al., 1989). The higher activities of GPx, SOD, and CAT and reduced activity of MDA in serum or liver tissues of the broiler chickens fed on the diets supplemented by 5 or 10 kg kaolin/ton, compared with the control group, were supported by Wu et al. (2013) stating that the activities of liver GSH-Px, CAT, and T-SOD were increased in the broiler chickens fed with 2 % natural clinoptilolite group and modified clinoptilolite group.
Lysosome activity is an effective tool in attacking the cell wall polysaccharide of different bacterial species (Manchenko, 1994), leading to a breakdown and hydrolyze a tetrasaccharide found most often in the cell wall of Grampositive bacteria. Moreover, improvement of lysosomal and bactericidal activity of broiler chickens' serum as a result of dietary kaolin addition did not significantly increase the immune stimulation, compared to the control group. The obtained data were in harmony with Harikrishnan et al. (2018), suggesting that C. idellus fed with kaolin enriched diet improved lysosome activity, compared to the control group. The Organic compound phase included the OH group, C-H group, and protein group with specific range and it was described as follows: The OH group represented by the band at 3441.01 cm-1 in the control sample was assigned to the abroad band which represents (OH) hydroxyl stretching due to intermolecular hydrogen bonding of the hydroxyl group. The results indicated that these groups were shifted in some conditions. In some samples, OH groups increased in comparison to the control sample and decreased in others. As noticed in the bone sample of the group with 10 kg kaolin as a feed additive was shifted to increase in comparison to the control group at 3448.72 cm-1. The C-H group recorded at the band with 2924.09cm-1 was assigned to C-H stretching in the control group. This band showed a similarity in groups fed on the basal diet supplemented by 10g kaolin/kg, compared to the control group, while increased in groups B to 2931.80cm-1 in comparison to the control group. The protein bands between 3421.1cm-1 and 2925.48cm-1 in group samples are protein characteristic and the increase and decrease of this band indicated the expansion or contraction of the protein area (Abdel Maksoud, 2010).
CONCLUSION
It can be concluded that supplementation of 0.5% or 1.0% of kaolin in broiler chickens' diet non-significantly improved growth performance, feed efficiency parameters, and bone mineralization and had no adverse effect on the serum lipid
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profile. Moreover, kaolin addition had a beneficial effect on antioxidant activity and immune response of broiler chicken, however, 0.5% of kaolin was more effective than higher concentration levels. Kaolinite has a low cation exchange capacity which easily adsorbs water. The result of Fourier Transform Infrared Spectroscopy indicates a similarity in the groups fed on the basal diet supplemented by 10 g kaolin/kg diet in comparison with the control group. The results show the start of mineralization and silicification in the bone.
DECLARATION
Competing interests
The authors declare that they have no known competing interests or personal relationships that could have appeared to influence the obtained results of this paper.
Acknowledgments
The authors would like to thank the Geology department, Faculty of Science, Cairo University, Egypt for their support. This research did not receive any specific grant from funding agencies in the public, commercial, or not-forprofit sectors.
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