Impact of adding natural bioactive mixture composed of lemon, onion, and garlic juice at different levels on productive performance, egg quality, and some blood parameters of commercial laying hens
Bulletin of the National Research Centre volume 43, Article number: 137 (2019)
The World Health Organization (WHO) encourages using medicinal herbs and plants to substitute or minimize the use of chemicals through the global trend to go back to nature. Many studies mentioned that using medicinal herbs and plants as feed additives seems to be a recent trend depending on availability and their cost but using them with monogastric animals and birds, as pharmaceutical tool, is available. Their action was manifested in a reduced expanding range of pathogenic microorganisms in the digestive tract, which resulted in the improvement of growth performance, efficient digestion, immunity, and health of poultry.
The present work aimed to establish the influence of adding natural bioactive mixture composed of the juice of lemon, onion, and garlic (LOG) at portions 1.00, 1.00, and 0.125/l clean water, respectively, to laying hens’ diets on their performance, egg quality, and some blood constituents. Seventy-two 30-week-old commercial Bovan Brown layers were randomly divided into four dietary treatment groups. Each treatment included eighteen hens in 6 replicates (3 birds each). All tested diets were almost isocaloric and isonitrogenous.
Adding LOG in laying hens’ diets significantly (P < 0.05) improved feed conversion throughout the second stage of egg collection in comparison with the control group. Inclusion of LOG in laying hen diets significantly (P < 0.05) improved the number of eggs/hen, percentage of egg production, and egg mass/hen throughout the second stage of egg collection comparing with the control (G1). Diet supplied by 1% LOG recorded the best value of yolk color (5.40) and yolk percentage (28.42%) compared with the other groups. Adding 2% or 3% LOG significantly (P < 0.05) decreased the total plasma cholesterol content compared to the control group. Inclusion of LOG at different levels significantly (P < 0.05) decreased blood plasma contents of GPT and GOT. However, insignificant decreases in blood plasma creatinine occurred comparing to control.
Adding the natural bioactive mixture composed of the juice of lemon, onion, and garlic can be safely used in improving the general health, egg weight, and feed conversion with decreasing the blood cholesterol of laying hens. Supplementation of LOG in the ration of hens improved the feed conversion and egg production.
Egg is an important animal protein resource which is greater than other protein resources in terms of amino acid score and is a rich source of minerals, vitamins, and other nutrients; moreover, lower price of egg has caused all segments of society to be able to access this high-quality protein resource. Anyways, quality and quantity of produced egg highly depend on nutritional and health management of laying hen farms (Motamedi and Taklimi 2014).
In general, using medicinal herbs and plants with humans has been known since the old civilizations. Old drug industry depended upon the raw material of medicinal herbs and plants and their extracts, which proved safe. Inversely, many synthesized chemicals’ additives caused many hazards to animal, plants, and humans. The World Health Organization (WHO) encourages using medicinal herbs and plants to substitute or minimize the use of chemicals through the global trend to go back to nature (El-Ashry et al. 2006).
Feed additive as garlic, onion, and lemon juice is experiencing a resurgence in animal health and production too. Meanwhile, the risk of the presence of human health has led to its prohibition for use in animal antibiotic, residues in milk and meat, and its effects on feeds (Wagr et al. 1994).
Dietary factors play a key role in the development of various human diseases, including cardiovascular disease. Garlic and its preparations have been widely recognized as agents for prevention and treatment of cardiovascular and other metabolic diseases, atherosclerosis, hyperlipidemia, thrombosis, hypertension, and diabetes (Banerjee and Maulik 2002).
The key active ingredient in garlic is a powerful plant chemical called allicin which rapidly decomposes to several volatile organosulfur compounds with bioactivities (Chang and Cheong 2008). Garlic (Allium sativum, Chihabi’s Dictionary of Agricultural and Allied Terminology 1988) is used both as condiment and medicament, anticoagulant, antioxidant, hypolipidaemic, antihypertensive, antiaging, antiplatelet, and heavy metal detoxifier (Agarwal 1996; Marilynn 2001).
Lemon (Citrus limonum, Chihabi’s Dictionary of Agricultural and Allied Terminology 1988) is a good source of potassium (145 mg/100 g fruit); calcium (61 mg); vitamin C (40 to 50 mg/100 g); vitamins A, B1, B2, and B3; and 27 Kcal/100 g (Murray 1993; Chevallier 1996). Also, lemon includes volatile oil (2.5% of the peel), limonene, alpha-terpinene, alpha-pinene, citral, coumarins, mucilage, pectins, and bioflavonoids (mostly from pith and peel as noted by Chevallier (1996), Miyake et al. (1999), Fisher and Phillips (2006), Manners (2007), and Miyake et al. (2007)). Lemon juice and lemon oil have been evaluated for antimicrobial action. The oil shows some bacteriostatic and antiviral action thought to be due to citral and linalool content (Fisher and Phillips 2006; Manners 2007). In addition for that, lemon also contained some active antioxidant compounds such as flavonoids, isoflavones, flavones, anthocyanins, coumarins, lignans, catechins, and isocatechins as reported by (Prior 2003; Ibrahim et al. 2011). Antimicrobial compounds produced by microorganisms have long been used in animal diets as growth promoters (Barragry and Powers 1994). However, their use has become highly regulated due to the possible development of drug resistance in human pathogenic bacteria (CAFA 1997).
Garlic (Allium sativum) has been used as spice and folk medicine since antiquity (Rivlin 2001). Bioactive components of garlic, including several sulfur-containing compounds such as alliin, diallyl sulfides, and allicin, may partly account for some effects of garlic (Amagase et al. 2001). These components are known to possess antibacterial (Sivam 2001), antifungal, antiparasitic, antiviral (Ankri and Mirelman 1999), antioxidant (Prasad et al. 1995), antithrombotic, vasodilatory, and anticancer (Agarwal 1996) activities.
Onion (Allium cepa L.) bulbs possess numerous organic sulphur compounds including Trans-S-(1-propenyl) cysteine sulfoxide, S-methyl-cysteine sulfoxide, spropylcycteine sulfoxides and cycloallicin, flavinoids, phenolic acids, sterols including cholesterol, stigma sterol, b-sitosterol, saponins, sugars and a trace of volatile oil compounds mainly of sulphur compounds. Also, most of the plant parts contain compounds with proven antibacterial, antiviral, antiparasitic, and antifungal properties and have antihypertensive, hypoglycemic, antithrombotic, antihyperlipidemic, anti inflammatory and antioxidant activity (Lampe 1999, Melvin et al. 2009). Both garlic and onion have been shown to have applications as antimicrobial, antithrombotic, antitumor, hypolipidaemic, antiarthritic, and hypoglycemic agents. In recent years, extensive research has focused on the beneficial and medicinal properties of garlic and onions. In particular, the use of these agents in the treatment and prevention of cardiovascular disease and cancer is an area of considerable investigation and interest (Ali et al. 2000; Williams and Lamprecht 2008).
Many investigators reported that garlic and onion are highly inhibitory to Escherichia coli and to other bacteria and fungi, e.g., antibacterial and antifungal (Sato et al. 1990), as enzyme inhibitory (Kumar and Berwal 1999).
Activities of garlic and onion have been widely studied; the active inhibitory principle of garlic is allicin or daily thiosolphinic acid (Saleem and Al-Delaimy 1982). Allicin is enzymatically released from precursor form when the garlic and onion bulbs are crushed.
Garlic, onion, and lemon juice is highly inhibitory to molds and fungi (Elgyyar et al. 2001). Also, Wangensteen et al. (2004), Khir and Ibrahim Nany (2007), Aiad et al. (2008), and Ahmed et al. (2009) noted that adding natural additive to feed well increases the antioxidant content and may have potentials as a natural antioxidant and thus inhibit unwanted oxidation processes.
So, this study aimed to establish the influence of incorporation natural bioactive mixture composed of the juice of lemon, onion, and garlic (LOG) at different levels on performance, egg quality, and some blood plasma constituents of commercial Bovan Brown laying hens.
This study was carried out at El-Nubaria Experimental and Production Station at El-Imam Malik Village which belongs to the Animal Production Department, National Research Centre, 33 El-Bohouth Street, Dokki, Cairo, Egypt.
This work was carried out in cooperation work between Animal Production Department, National Research Centre and Regional Centre for Food and Feed, Agriculture Research Centre, Ministry of Agriculture, Giza, Egypt.
Preparation the natural mixture for Feed supplementary
It is composed of the juice of lemon, onion, and garlic (LOG) at portions 1.00, 1.00, and 0.125/l clean water, respectively, of which its addition to laying hens’ diets influenced their performance, egg quality, and some blood constituents.
Animal experiment design
Seventy-two 30-week-old commercial Bovan Brown layers were housed in individual wire cages and divided into four equal treatment groups of thirty hens each (10 replicates of three birds each). All hens were kept under the same managerial, hygienic, and environmental temperature which ranged from 22 to 38 °C and humidity from 40 to 60% during over all the experimental intervals (3 periods of 4 weeks each). Also, the lighting schedule was 16-h light to 8-h dark/day.
The experimental diets consisted of antibiotic-free layer mash formulated to meet the nutrient requirement for layers as established by NRC (1994).
Feed and water were offered ad libitum. Egg weight (EW) and egg number (EN) were recorded daily. Feed intake (FI) was recorded weekly, while feed conversion ratios (FCR) were calculated.
Egg quality assessment
Six eggs from each treatment were used after being weighed. Using a Vernier Caliper, egg shape index was assessed by measuring the egg length (along the longitudinal axis) and egg width (along the equatorial axis). The index was expressed as a ratio of width to length according to the following equation as extrapolated by Anderson et al. (2004).
Each egg was then carefully broken onto a flat plate, and the height of the albumen was measured midway between the yolk and the edge of albumen using a tripod micrometer. The yolk was separated from the albumen and weighed, and the albumen Haugh units were calculated from the tables according to the relationship between egg weight and albumen high as described by Doyon et al. (1986) depending on the following equation:
where HU = Haugh unit, H = height of the albumen (millimeters), and W = weight of the egg (grams).
Also, yolk index was estimated according to the relationship between yolk high and yolk diameter using the following equation:
Shell thickness of the dried shells with intact membrane was measured with a micrometer (Lasec, Berlin, Germany) to the nearest 0.01 mm and calculated as the mean of 3 measurements taken at the broad end, equator, and narrow end as noted by Günlü et al. (2003).
Albumen weights were obtained by determining the difference between the whole egg weight and weights of yolk and shell added together.
Chemical analysis of feed ingredients was analyzed according to AOAC (2005) methods.
At the end of the third stage of egg collection, blood samples were collected from the wing vein of laying hens using sterilized syringes and needles. Collection of blood samples were centrifuged at 4000 rpm for 20 min, for preparation of blood plasma. Plasma was kept frozen at − 18 °C for subsequent analysis.
Various blood plasma chemical parameters were calorimetrically determined using commercial kits, following the same steps as described by the manufacturers.
Plasma total protein was determined according to Armstrong and Carr (1964) and Witt and Trendelenburg (1982) and albumin according to Doumas et al. (1971) and (Tietz 1986); globulin was calculated by subtracting the albumin value from the total protein value and total cholesterol according to Allain et al. (1974) and Pisani et al. (1995). Alkaline phosphates activity was measured according to the method of Beliefield and Goldberg (1971); plasma glutamic oxaloacetic transaminase (GOT) and glutamic pyruvic transaminase (GPT) activities were determined as described by Reitman and Frankel (1957) and Harold (1975); creatinine (Husdan 1968); high-density lipoprotein (HDL) concentration was estimated according to the Assmann (1979). Also, albumin to globulin ratio (A:G ratio) was calculated.
Data collected for laying hens’ performance including the number of egg/hen, egg production percentages, egg mass, egg weight, feed consumption, and feed conversion; blood parameters including total protein, albumin, globulin, A:G ratio, total cholesterol, HDL, GPT, GOT, alkaline phosphates, and creatinine; and egg quality including egg weight, shape index, yolk index, Haugh unit, yolk color, shell thickness, albumin percentage, yolk percentage, and shell percentage were subjected to statistical analysis using the one way analysis of variance according to SPSS (2008). Duncan’s multiple range test (Duncan 1955) was used to separate means when the dietary treatment effect was significant according to the following model:
where Yij = observation; μ = overall mean; Ti = effect of experimental diets for i = 1–4, 1 = laying hens receiving diet not containing LOG, 2 = laying hens receiving diet sprayed by 10 ml LOG/kg feed, 3 = laying hens receiving diet sprayed by 20 ml LOG/kg feed, and 4 = laying hens receiving diet sprayed by 30 ml LOG/kg feed; and eij = the experimental error.
Composition and calculated chemical analysis of experimental diets
Data presented in Table 2 show that control diet was formulated to cover the laying hens’ diets (17% CP and 2750 kcal ME/kg DM feed). Chemical analyses of different tested diets approximately were not altered by LOG compared with control diet. So, all tested diets appear almost isocaloric and isonitrogenous.
Performance of laying hens
Data illustrated in (Table 3) clear that adding LOG had no significant effect on average of egg weight throughout the three stages of egg collection. In the first stage, G4 is superior (P < 0.05) compared to G3. However, it had no significant effect on feed consumption/hen/day throughout the first and second stages of egg collection. On the other hand, feed conversion insignificantly improved through out of the first and third stages of egg collection, but it was significantly (P < 0.05) improved through out of second stage of egg collection in comparison with the control group hens.
Egg production of laying hens
Data presented in Table 3 clear that adding LOG in laying hens’ diets significantly (P < 0.05) improved the number of eggs/hen, percentage of egg production, and egg mass/hen throughout the second stage of egg collection comparing with the control. Egg production and quality are heritable traits of major concern for breeders and consumers. To improve these characteristics, correct nutritional, management, and environmental practices are needed to enhance egg production and quality. Eggs are delicate product which can lose quality rapidly during the period of collection to consumption.
Egg quality of laying hens
Data presented in Table 4 clear that incorporation LOG at different levels of supplementation in laying hens’ diets had no significant effect on all parameters of egg quality; however, insignificant increases were noticed with egg weight, shape index, yolk index, and shell thickness in comparison with the control group. On the other hand, laying hens receiving 1% LOG-containing diet recorded the best value of yolk color (5.40) and yolk % (28.42%) compared with the other groups.
Moreover, Haugh unit insignificantly decreased with adding LOG in laying hens’ diets. Meanwhile, laying hens offered 2% LOG recorded the highest value of shell percentage (12.84) in comparison with the other groups.
Blood plasma constituents of laying hens
Data illustrated in Table 5 show that incorporation of 1% LOG in laying hens’ diets (G2) insignificantly increased both total protein and globulin in comparison with the control; meanwhile, the others of two levels of supplementation (G3 and G4) significantly (P < 0.05) decreased the total protein and globulin comparing with control and 1% LOG. On the other hand, G2 significantly (P < 0.05) increased the albumin content; however, G3 and G4 insignificantly increased the content of albumin compared to control. Moreover, A:G ratio significantly (P < 0.05) increased by adding 2 or 3% LOG (G3 and G4) compared to control.
Data of lipid contents including both HDL and total cholesterol (Table 5) cleared that incorporation of LOG in laying hen diets at 1% or 3% insignificantly decreased HDL content; meanwhile, laying hens receiving 2% LOG-containing diet caused a significant (P < 0.05) decrease in their content of plasma LDL. Incorporation of 2% or 3% LOG caused a significantly (P < 0.05) decrease in the total plasma cholesterol content compared to control and 1% LOG-containing diets.
Inclusion of LOG at different levels significantly (P < 0.05) decreased blood plasma contents of GPT and GOT in laying hens (Table 5).
Adding LOG at different levels insignificantly decreased blood plasma content of creatinine compared to control (Table 5). On the other hand, incorporation of LOG at 2% or 3% significantly (P < 0.05) decreased alkaline phosphatase.
The present results of feed intake were in agreement with those noticed by Khan et al. (2008) who noted that supplementation of garlic powder had no effect on the feed consumption in native Desi laying hens. Also, Qureshi et al. (1983b) did not report any differences in daily feed consumption of pullets fed diets with various garlic products at levels equal to about 50 kg/ton of added garlic bulb. On the other hand, Khan et al. (2007), Nusairat (2007), and Asrat et al. (2018) reported that feed consumption of layers was increased with increasing the level of garlic powder supplementation in laying diets. This is an attribute of rich aromatic oil content of garlic which enhances digestion. Also, Adibmoradi et al. (2006) observed that garlic administration enhanced villus height and crypt depth and decreased epithelial thickness and goblet cell numbers in the duodenum, jejunum, and ileum of birds. The morphological changes in the birds’ gut proclaim improvement in the digestive capacity and improved activity of the pancreatic enzyme. Also, Chowdhury et al. (2002) showed that feed consumption and feed efficiency were not affected by supplementation of 0, 2, 4, 6, 8, or 10% garlic paste (P > 0.05) as averaged over the 6-week period. The discrepancy between the results of this experiment and other similar work might be resulted due to the fact that the duration of the experiment was different and also the difference in garlic products. The present results of feed conversion were in agreement with those attributed by Lewis and Elvin-Lewis (2003) and Demir et al. (2003) who concluded an improvement in the feed conversion ratio of broilers fed garlic. Meanwhile, Asrat et al. (2018) found that feed conversion was not affected by the addition of garlic powder in White Leghorn hens.
The improvement in egg quality (Table 3) is of paramount importance in the field of production and management (Mahmoud et al. 2010). There is a dearth of literature available concerning the beneficial effects of garlic or onion or their juices on egg quality. So, Yalcin et al. (2006) observed that egg weight increased when laying hens were fed 5 and 10 g/kg garlic powder. Also, Khan et al. (2007) reported that egg production increased during the 6 weeks in which 0, 2, 6, or 8% garlic powder was fed to laying hens. On the other hand, Canogullari et al. (2010) noted that egg production increased significantly by adding 1% garlic powder in the feed of laying hens. Meanwhile, Reddy et al. (1991) and Chowdhury et al. (2002) showed that the supplementation of garlic powder did not affect egg production. Moreover, Khan et al. (2012) found that garlic is one of such potential feed supplements which has recently been reported as having a wide range of beneficial effects of the production performance and physiological biochemistry of laying hens. However, Chowdhury et al. (2002) recorded that egg production was not affected by supplementation of 0, 2, 4, 6, 8, or 10% garlic paste as averaged over the 6-week period.
Egg quality of laying hens (Table 4) in agreement with those noted by Canogullari et al. (2010) who showed that egg weight, yolk index, shell weight, shell thickness, yolk weight did not change when laying hens were fed with diet containing 1% garlic powder; meanwhile, eggshell index and Haugh unit decreased significantly when laying hens received diet containing 4% garlic powder. Meanwhile, Yalcin et al. (2006) reported that the supplementation of garlic had no significant effect on egg albumin index, eggshell index, and egg Haugh unit values when laying hens were fed with diets containing 5 or 10 g/kg garlic powder for 22 weeks. On the other hand, Mahmoud et al. (2010) recorded that egg albumin, yolk and shell weight, albumin height, and Haugh unit were improved when laying hens were supplemented with 0.25, 0.50, and 1% garlic juice. Moreover, Mottaghitalab and Taraz (2002) noted that the inclusion of 0, 5, 10, and 15 g/kg garlic powder significantly decreased yolk weight. But, Khan et al. (2008) showed that feeding 8% garlic powder may result in better egg production in Desi laying hens, with no effect on egg mass and egg weight. The differences in the results of different reports may be due to the different experiment protocols and garlic preparation in their experiments (Canogullari et al. 2010).
Blood plasma constituents of laying hens (Table 5) were exactly near from the results obtained by El-katcha et al. (2016) who showed that garlic extract (allicin) supplementation at 50 mg/kg diet significantly increased total protein and albumin concentrations by about 4.7 and 5.9%, respectively, while allicin supplementation at 25, 75, or 100 mg/kg had no significant effect on total protein and albumin concentrations compared with the control. Also, they noted that allicin supplementation had no significant effect on globulin blood serum concentration compared to the control. Moreover, Oleforuh-Okoleh et al. (2015) noted that the total protein, albumin, and globulin significantly increase with adding garlic compared with the control one. Also, the present results were in agreement with those noted by Omer et al. (2015) who indicated that the incorporation of LOG in growing rabbits at 0.5, 1, 1.5, and 2% had no significant effect on total protein and globulin, while it significantly affected (P < 0.05) albumin for rabbit receiving 1 or 1.5% LOG and albumin to globulin ratio for rabbit offered with diet containing 1.5% LOG. Also, Ahmed et al. (2009) reported that serum total protein was not significantly affected by the natural additive (LOG) when added to calves’ rations. In addition, Bush (1991) noted a positive correlation between dietary protein and plasma protein concentration. This indicates that the supplement had not affected protein synthesis in liver function. Also, the low level of proteins may be attributed to a decrease in the protein absorbed and synthesized and an increase in protein losses. Also, Hassan and Abdel-Raheem (2013) mentioned that calves fed with diets containing garlic had greater (P < 0.05) serum concentrations of globulin.
Lipid content (Table 5) in harmony with those obtained by Motamedi and Taklimi (2014) noted that laying hens receiving diets containing 1% garlic powder, 1% fenugreek, and 1% garlic powder + 0.5% fenugreek decreased LDL compared to the control group. Also, Saffa (2007) reported a reduction in total concentration of plasma cholesterol as well as LDL as a result of adding garlic and fenugreek to the diet of laying hens. On the other hand, Motamedi and Taklimi (2014) observed that inclusion of 2% garlic and fenugreek had beneficial effects on the cholesterol metabolism without having any adverse effect on the laying hens’ performance. In addition, Ao et al. (2010) studied the effect of using garlic powder on plasma cholesterol concentration of laying hens, and they noted that by increasing the amount of garlic powder in the diet from 0.00 to 3%, blood serum cholesterol concentration has been significantly decreased. Meanwhile, Saki et al. (2014) observed that levels of serum HDL in laying hen fed with diets containing 8 or 12 g kg−1 herb mixture were increased significantly. Interestingly, LDL levels were increased by supplementation of phytogenic feed additive treatments. However, serum triglyceride and cholesterol concentration were not affected by herb mixture supplementation. Also, Canogullari et al. (2010) showed that plasma HDL and LDL levels were higher in birds fed with diets containing 10, 20, or 40 g kg−1 garlic powder than those in the control diet. On the other hand, Azeke and Ekpo (2009) noted that the reductions of the total cholesterol, total triglyceride, LDL, and HDL were observed by garlic powder supplementation at levels of 10 and 20 g kg−1 in laying hens’ diet. Canogullari et al. (2010), Kim et al. (2009), and Chowdhury et al. (2002) have shown that plasma LDL cholesterol was dropped linearly with 5–20 g kg−1 garlic powder in diet, but HDL cholesterol concentration was not affected. Meanwhile, Ghasemi et al. (2010) reported that plasma levels of cholesterol, triglyceride, HDL, and LDL were not affected by dietary inclusion of 0.1 and 0.2 g kg−1 mixture of garlic and thyme powder. Meanwhile, Omer et al. (2015) noted that incorporation of LOG as natural bioactive mixture in rabbit rations at 1.5% or 2% significantly (P < 0.05) decreased total cholesterol in comparison with the control, while the addition of 0.5% or 1% LOG did not alter significantly with the other groups. Also, they reported that treatments contained (1%, 1.5%, and 2% LOG) significantly (P < 0.05) decreased low-density lipoprotein (LDL), while it had no significant effect on high-density lipoprotein (HDL) for rabbits. In addition, Hassan and Abdel-Raheem (2013) found that calves fed with diets containing garlic caused lowering in cholesterol content compared to those fed with the control diet. Also, El-Ashry et al. (2006), Abo El-Nor et al. (2007), and Ahmed et al. (2009) observed that the mean values of blood metabolites were higher in animals fed with diets containing medicinal herbs than the control. The lowering in total cholesterol in the present study could be ascribed to LOG which is thought to have various pharmacologic properties. Lower serum and liver cholesterol (Qureshi et al. 1983a) inhibit bacterial growth (Cavallito and Bailey 1944), inhibit platelet growth, and reduce oxidative stress (Horie et al. 1992).
Results of liver function (Table 5) were in disagreement with those obtained by Ahmed et al. (2009) who found that blood components of GPT and GOT were significantly increased (P < 0.05) by increasing natural additive (LOG) in calves. On the other hand, Omer et al. (2015) noted that the incorporation of LOG in rabbit diets significantly (P < 0.05) decreased GOT; meanwhile, it had no significant effect on the GPT content. Also, Hassan and Abdel-Raheem (2013) noted that calves fed with diets containing garlic depressed the level of GPT in comparison with those animals fed with control ration.
The present results of kidney function were in agreement with those obtained by Omer et al. (2015) who noted that inclusion of LOG in rabbit diets significantly (P < 0.05) decreased creatinine; however, rabbits receiving diet containing 2% LOG significantly (P < 0.05) decreased alkaline phosphatase compared to the control group and rabbits that received 0.5% or 1% LOG.
Under the same condition, it can be mentioned that adding natural bioactive mixture composed of the juice of lemon, onion, and garlic (LOG) at portions 1.00, 1.00, and 0.125/l clean water, respectively, to laying hens’ diets can be safely used in improving the general health, egg weight, and feed conversion of hens with decreasing blood cholesterol.
Availability of data and materials
Not applicable for this section.
- A:G ratio:
Albumin to globulin ratio
Official Methods of Analysis
Feed conversion ratios
Glutamic oxaloacetic transaminase
Glutamic pyruvic transaminase
Height of the albumen
Juice of lemon, onion, and garlic
National Research Council
Standard error of mean
Statistical Package for Social Sciences
- W :
Weight of the egg
World Health Organization
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Omer, H.A.A., El-Mallah, G.M.H., Abdel-Magid, S.S. et al. Impact of adding natural bioactive mixture composed of lemon, onion, and garlic juice at different levels on productive performance, egg quality, and some blood parameters of commercial laying hens. Bull Natl Res Cent 43, 137 (2019). https://doi.org/10.1186/s42269-019-0160-4
- Laying hens
- Natural bioactive mixture
- Egg quality
- Blood plasma constituents