Phytogenics (Lemon and orange peels) influenced the performance, gut morphology and blood profile of broiler chickens

2020 ◽  
Vol 47 (3) ◽  
pp. 234-244
Author(s):  
A. O. Fafiolu ◽  
J. O. Alabi ◽  
C. G. Godwin ◽  
I. D. Dada ◽  
A. A. Orimogunje ◽  
...  
Keyword(s):  
Lipid Profile ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Haemoglobin Concentration ◽  
Basal Diet ◽  
Feed Additives ◽  
Control Group ◽  
Broiler Chicks ◽  
Blood Profile ◽  
Gut Morphology

This study evaluated the effect of phytogenic feed additives (Lemon peel, LP and Orange peel, OP) added singly or in combination to basal diets on the performance, gut morphology, haematology, serum biochemistry and lipid profile of broiler chickens. Four nutritionally adequate Corn-Soybean based diets were generated by the addition of LPand/or OPto basal diet. A total of 320, 1-d-old Marshall strain broiler chicks were given the basal diet supplemented with no additive (T1), 500g/tonne of LP (T2), OP (T3), or LP+OP (T4) in a study which lasted for 42 days. Growth performance was assessed weekly while gut and blood samples were collected at d 42 for examination. Data generated were analyzed using ANOVA with a P<0.05 level of significance. Results showed that chickens fed diets supplemented with LP and OP had similar (P>0.05) growth performance compared with the control group. Higher (P<0.05) duodenal and jejunal villus height were observed in chickens fed LP and OP, respectively. Phytogenics inclusion caused reduced (P<0.05) laminal propria depth at the ileum segment. Higher (P<0.05) PCV (30.00%), total protein (6.89 g/L) and albumin (3.67 g/L) were observed in chickens on LP+OP. Haemoglobin concentration (Hb) and RBC were not affected by the treatments imposed. Serum creatinine, uric acid and liver enzymes (AST and ALT) activity were reduced (P<0.05) with inclusion of LP and OP in broiler diets. Increase (P<0.05) HDL and decrease total cholesterol, LDL and triglycerides were observed in broilers fed LP and OP. Dietary inclusion of LP and OP had positive influence on gut morphology, RBC production, plasma protein reserves and lipid profile of broiler chickens.

scholarly journals The Effect of Dietary Inclusion of Sesame indicum Leaves on Haematology and Serum Parameters of Broiler Chickens

2019 ◽  
Vol 2 (1) ◽  
pp. 73-78
Author(s):  
Olusegun S. Adedeji ◽  
Shola R. Amao ◽  
Kayode S. Olugbemiga
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Basal Diet ◽  
Well Being ◽  
Feed Additives ◽  
Broiler Chicks ◽  
Growth Promoters ◽  
Serum Parameters ◽  
Randomized Design ◽  
Experimental Trials

Introduction: Various types of feed additives have been evaluated under commercial conditions and in experimental trials with the aim to achieve improvements on growth performance and the best economic return. Herbs, including Sesame indicum leaves, spices and various plant extracts/essential oils can be used as alternatives to replace antibiotic growth promoters as they are rich in phytochemicals (active compounds) that can be used to stimulate growth and health of the animals. The uses of all these herbs should be studied in relation to the blood and serum indices of the animals in order to determine their harmful level of consuming them by the animals. Therefore, the aim of the study is to determine the effect of different dietary inclusion levels of Sesame indicum leaves on haematology and serum parameters of broiler chickens at both starter and finisher phases. Methods: A total of one hundred and fifty 1-day old, unsexed (Marshal) broiler chicks were randomly divided into five experimental groups at rate of 30 birds per group. Each group was further subdivided into three replicates at the rate of ten chicks per replicate in a Complete Randomized Design. A maize-soybean basal diet served as control while the Sesame indicum leaves was added to the basal diets at level (0g, 10g, 20g, 30g and 40g/kg) resulting in five formulae, respectively. At the end of the 4th and 8th weeks respectively, six birds were randomly selected from each of the replicate and blood samples were collected from the jugular vein of birds for haematology and serum. Results: The results indicated that all the haematology and serum parameters were significantly (p < 0.05) affected by the different inclusion levels of S. indicum leaves but the value obtained were within the recommended range while birds fed with the diet containing 40g/kg of S. indicum leaves had the highest values. Conclusion: Inclusion of S. indicum leaves in the diets appear not to have detrimental effect on the haematology and serum parameters of the experimental birds. The study recommended that 40g/kg inclusion level be adopted as it improved growth performance and general well-being of broiler chickens.

scholarly journals Growth Performance, Nutrient Digestibility, Biochemical Properties, Hematological Traits, and Intestinal Histopathology of Broiler Chicks Fed Mannan Oligosaccharides

2021 ◽  
Vol 11 (4) ◽  
pp. 621-633
Author(s):  
Abdallah Ali Ghazalah ◽  
Mohamed Ahmed Fouad El-Manylawi ◽  
Hady Fathy Abbas Motawe ◽  
Marwa Salah Khattab ◽  
Yara Ibrahem Youssef
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Density Lipoprotein ◽  
Basal Diet ◽  
Blood Parameters ◽  
Nutrient Digestibility ◽  
The Other ◽  
Control Group ◽  
Broiler Chicks ◽  
Treatment Groups

, , , , and Antibiotics as growth promoters in poultry diets are currently restricted, so other feed additives, such as prebiotics and probiotics, have been suggested as an antibiotics alternative to improve the performance and gut health of poultry. The current experiment was conducted to study the effects of adding Mannan oligosaccharides (MOS) as a potential replacement for an antibiotic on productive performance, nutrient digestibility, some blood parameters, and caecal microbiota of broiler chickens. For conducting the current research experiment, a total of 180 one–day old Ross broiler chicks were randomly divided into one control group fed a basal diet and four dietary treatments with six replicates for each treatment. The treatment groups were fed a basal diet supplemented with different levels of MOS 0.5, 1, and 2 g/Kg diet and Lincomycin 4.4 mg/Kg diet during 35 days of the feeding trial. With exception of the growing period, the group fed a basal diet supplemented with 2 g MOS/Kg feed had considerably higher body weight and weight gain, while having the lowest feed consumption and best feed conversion ratio compared to the other treatment groups, during all experimental periods. Moreover, dietary supplementation of MOS resulted in a significant decrease in the counts of caecal E. coli and Enterococcus, while Lactobacillus and Yeast bacteria counts were significantly higher, compared to non-supplemented groups. Broiler chicks having a 2 g MOS/kg diet recorded lower values of cholesterol, low-density lipoprotein (LDL), urea, and liver enzymes, including Aspartate transaminase (AST) and Alanine aminotransferase (ALT), while they recorded significantly higher high-density lipoprotein (HDL), compared to the other experimental groups. Group treated with MOS 2 g/Kg feed improved digestibility of crude protein, ether extract, crude fiber, nitrogen-free extract, and organic matter, compared to the control group, Additionally, MOS supplementation also increased the intestinal villi length, width, and crypt depth and decreased intestinal inflammation, compared to the control group. In conclusion, supplementation of MOS at 2 g/kg diet improved growth performance, digestibility, and blood parameters without having adverse effects on the intestine of broiler chickens, comparable to the Lincomycin.

scholarly journals Effects of Nigella sativa and amino acids on growth performance and haematological parameters of broiler

2020 ◽  
Vol 17 (2) ◽  
Author(s):  
M. S. U. Akon ◽  
M.R. Amin ◽  
M. T. Hussan ◽  
R. Akhter ◽  
M. L. Mollah
Keyword(s):  
Amino Acids ◽  
Growth Performance ◽  
Nigella Sativa ◽  
Haemoglobin Concentration ◽  
Feed Additives ◽  
Cross Resistance ◽  
Control Group ◽  
Broiler Chicks ◽  
Feed Conversion ◽  
Growth Promoters

Background: Recently, the use of antibiotic growth promoters has been banned in many countries due to cross-resistance among pathogens and residues in tissues, which led to search for the alternative feed additives in animal production. The aim of this study was to investigate the effects of “Kalo jeera” (Nigella sativa) powder and amino acids supplementation on the growth of broiler chicks and their blood parameters. Methods: A total of 100 day-old (Cobb® 500) chicks were randomly divided into four groups such as T0, T1, T2, T3, and each group contained 25 chicks. The group T0 was used as control and groups T1, T2 and T3 were treated group. Chicks of control group were fed with only basal diet and no supplements were supplied, and chicks of treatment group including T1, T2 and T3 were supplemented with amino acids, Nigella sativa powder and combination of Nigella sativa and amino acids, respectively. Body weight was recorded on 7th, 14th, 21th, 28th and 35th day of age. Haematological tests were performed at 15th, 25th and 35th day of age. Results: The results showed that net weight gain and feed conversion ratio were improved in the treated groups than that of the control group. Among the treated groups, the significant level of improvement was achieved in the T3 group followed by T1 and then T2. Total erythrocyte count, packed cell volume and haemoglobin concentration were significant (p<0.01) in the treated groups as compared to control. Conclusions: The results suggest that better growth performance could be achieved in broilers supplemented with Nigella sativa and amino acids in combination and those can be used as growth promoters.

scholarly journals Growth performance and haematology of broiler chickens fed enzyme supplemented neem leaf meal -based diets

2021 ◽  
Vol 48 (5) ◽  
pp. 152-164
Author(s):  
A. A. Akintomide ◽  
I. B. Osho ◽  
G. E. Onibi
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Haemoglobin Concentration ◽  
Average Weight ◽  
Broiler Chicks ◽  
Poultry Production ◽  
Feed Conversion ◽  
Blood Profile ◽  
Leaf Meal ◽  
Body Weights

The quest for sustainable poultry production using alternative feed ingredients is imperative. This study was conducted to assess the growth performance and blood profile of broiler chickens fed neem leaf meal (NLM) based diets with or without enzyme supplementation. Two hundred and eighty-eight, one-week old chicks (with an average weight of 98.44g) arranged in a completely randomized design with twelve birds/ replicate and three replicates/ treatment were fed NLM at 0, 1.5, 3 and 5% with or without Polyzme® to form eight experimental treatments. Data on initial body weights, weekly body weights and feed intake were taken during the trial which lasted for eight weeks and feed conversion ratio calculated. Blood was also collected for haematological studies at the 4 and 8 week by humanely severing the jugular vein. Results indicated that total weight gain at starter phase decreased progressively with increase in NLM inclusion and addition of Polyzme did not significantly (P>0.05) affect performance. At the finisher phase, growth performance was not significantly (P>0.05) influenced by NLM or enzyme addition. Furthermore, NLM with/without Polyzyme did not elicit any significant influence on the packed cell volume and haemoglobin concentration of the chickens. In conclusion, broiler chicks could tolerate up to 3% NLM and finishers up to 5% based on growth performance. The use of polyzyme at 400g/tonne in this study did not improve the utilization of NLM by the chickens.    La recherche de la production de volaille durable utilisant des ingrédients d'alimentation alternatifs est impérative. Cette étude a été réalisée pour évaluer la performance de la croissance et le profil sanguin des régimes à base de feuilles neem (NLM) avec ou sans supplémentation en enzyme. Deux cent quatre-vingt-huit poussins âgés d'une semaine (avec un poids moyen de 98,44 g) disposés dans un design complètement randomisé avec douze oiseaux / répliqués et trois répliqués / traitement ont été nourris à 0, 1,5, 3 et 5% avec ou sans Polyzme pour former huit traitements expérimentaux. Les données sur les poids corporels initiaux, les poids corporels hebdomadaires et l'apport alimentaire ont été pris au cours de l'essai qui a duré huit semaines et le ratio de conversion alimentaire calculé. Le sang a également été collecté pour des études hématologiques à la 4ème et 8ème semaine en coupant humainement la veine jugulaire. Les résultats ont indiqué que le gain de poids total à la phase de démarrage a diminué progressivement avec l'augmentation de l'inclusion de NLM et l'addition de polyzme n'a pas significativement (p> 0,05) affecter les performances. À la phase de finition, la performance de la croissance n'était pas significativement (p> 0,05) influencée par l'addition NLM ou enzyme. De plus, la NLM avec / sans polyzyme n'a suscité aucune influence significative sur le volume de la cellule emballé et la concentration en hémoglobine des poulets. En conclusion, les poussins de chair pourraient tolérer jusqu'à 3% de NLM et des finisseurs jusqu'à 5% sur la base de la performance de la croissance. L'utilisation de polyzyme à 400 g / tonne dans cette étude n'a pas amélioré l'utilisation de NLM par les poulets.

Effects of feeding Isomaltooligosaccharides on the growth performance, carcass traits and immune response of broiler chickens

2014 ◽  
Vol 3 (1) ◽  
pp. 150-157
Author(s):  
Khalid M. Gaafar
Keyword(s):  
Immune Response ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Carcass Traits ◽  
Dietary Supplementation ◽  
Control Group ◽  
Broiler Chicks ◽  
Feed Conversion ◽  
Flu Vaccine ◽  
Lipids Profile

The research was conducted to study the effect of feeding broiler chickens on diets containing isomaltooligosaccharides on the growth performance, carcass traits and immune response. 90-one day old broiler chicks were used according to completely randomized two treatment groups and one control, 30 birds each. Birds fed ad-libitum on basal starter and grower-finisher diets for 35 day. Diets of treatment`s groups contained 0.5 g/Kg and 1 g/Kg of Isomaltooligosaccharides, while the control group fed on the basal diets without Isomaltooligosaccharides supplementation. Dietary supplementation of broiler chickens with Isomaltooligosaccharides improved body weight, feed conversion, carcass traits, two lymphoid organs weight and log antibody titer against avian flu vaccine. Most of the highest values were for birds fed low levels of Isomaltooligosaccharides. Feed intake decreases as Isomaltooligosaccharides level increases. Dietary supplementation with Isomaltooligosaccharides did not affect the lipids profile (triglycerides, total cholesterol, LDL and HDL), however the blood VLDL levels decreased with increased levels of Malondialdehyde and Glutathione reductase. Collectively, Dietary supplementation of broiler chickens with 0.5 g/Kg diet of Isomaltooligosaccharides improved growth performance, carcass traits and immune status.

scholarly journals Dietary Enteromorpha Polysaccharide Enhances Intestinal Immune Response, Integrity, and Caecal Microbial Activity of Broiler Chickens

2021 ◽  
Vol 8 ◽  
Author(s):  
Teketay Wassie ◽  
Zhuang Lu ◽  
Xinyi Duan ◽  
Chunyan Xie ◽  
Kefyalew Gebeyew ◽  
...  
Keyword(s):  
Immune Response ◽  
Gut Microbiota ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Marine Algae ◽  
Basal Diet ◽  
Control Group ◽  
Villus Height ◽  
Crypt Depth ◽  
Caecal Microbiota

Marine algae polysaccharides have been shown to regulate various biological activities, such as immune modulation, antioxidant, antidiabetic, and hypolipidemic. However, litter is known about the interaction of these polysaccharides with the gut microbiota. This study aimed to evaluate the effects of marine algae Enteromorpha (Ulva) prolifera polysaccharide (EP) supplementation on growth performance, immune response, and caecal microbiota of broiler chickens. A total of 200 1-day-old Ross-308 broiler chickens were randomly divided into two treatment groups with ten replications of ten chickens in each replication. The dietary treatments consisted of the control group (fed basal diet), and EP group (received diet supplemented with 400 mg EP/kg diet). Results showed that chickens fed EP exhibited significantly higher (P &lt; 0.05) body weight and average daily gain than the chicken-fed basal diet. In addition, significantly longer villus height, shorter crypt depth, and higher villus height to crypt depth ratio were observed in the jejunal and ileal tissues of chickens fed EP. EP supplementation upregulated the mRNA expression of NF-κB, TLR4, MyD88, IL-2, IFN-α, and IL-1β in the ileal and jejunal tissues (P &lt; 0.05). Besides, we observed significantly higher (P &lt; 0.05) short-chain volatile fatty acids (SCFAs) levels in the caecal contents of the EP group than in the control group. Furthermore, 16S-rRNA analysis revealed that EP supplementation altered gut microbiota and caused an abundance shift at the phylum and genus level in broiler chicken. Interestingly, we observed an association between microbiota and SCFAs production. Overall, this study demonstrated that supplementation of diet with EP promotes growth performance, improves intestinal immune response and integrity, and modulates the caecal microbiota of broiler chickens. This study highlighted the application of marine algae polysaccharides as an antibiotic alternative for chickens. Furthermore, it provides insight to develop marine algae polysaccharide-based functional food and therapeutic agent.

scholarly journals The Effect of Replacing Dried Meal Worm with Soybean Meal on Growth Performance and Carcass Characteristics of Broiler Chickens

2021 ◽  
Author(s):  
Navid Naderi Boroojerdi ◽  
Mostafa Rajabzadeh
Keyword(s):  
Growth Performance ◽  
Soybean Meal ◽  
Broiler Chickens ◽  
Relative Weight ◽  
Carcass Characteristics ◽  
Basal Diet ◽  
Control Treatment ◽  
Broiler Chicks ◽  
Feed Conversion ◽  
Significant Difference

Abstract An experiment was conducted on 240 one-day old male (Ross308) chicken to the effect of substitution of dried mealworm (Tenebrio molitor) with soybean meal on growth performance and carcass characteristics broiler chicks. Chicks fed in a completely randomized design with 4 replicate cages (12 birds per cage). Five dietary treatments used: 1- Control treatment: Basal diet based on corn-soybean meal without adding dried mealworm, 2- Replacement of 5% dried mealworm with soybean meal in the base diet, 3- Replacement of 10% dried mealworm with soybean meal in the base diet, 4- Replacement of 15% dried mealworm with soybean meal in the base diet and 5- Replacement of 20% dried mealworm with soybean meal in the base diet. The results of the experiment showed that 3rd and 4th treatments with a substitution of 10 and 15 percent showed a higher mean weight gain and a daily gain, but their feed intake was lower comparing other treatments, and finally, the feed conversion ratio showed a significant decrease with respect to control treatment using these replacement levels. At 21 and 42 days of age, carcass yield and relative weight of the breasts showed significant increases in treatments 3 and 4, and other characteristics of chicken carcasses were not affected by the test treatments. The experiment showed that replacing soybean meal with 10% and 15% worm powder significantly improved the performance of broiler chickens, but no significant difference was found between the two levels.

Effects of Compound Probiotics on Growth Performance, Intestinal Microflora and Immune Function of Broilers

2014 ◽  
Vol 997 ◽  
pp. 178-184
Author(s):  
Hong Ling Wang ◽  
Yu Hong Yang ◽  
Jia Qing Wang ◽  
Zhuo Wang ◽  
Shuang Ma
Keyword(s):  
Immune Function ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Intestinal Microflora ◽  
Basal Diet ◽  
Experimental Period ◽  
Control Group ◽  
Group Iii ◽  
Serum Biochemical ◽  
Anti Body

This study aimed to investigate the efficacy of compound probiotics on broiler performance, intestinal microflora, immune function and serum biochemical indicators. Four hundred one-d-old female broiler chickens were randomly divided into 4 groups with 4 replicates in each group and 25 chickens per replication. The chickens in groupI(control group) were fed a basal diet, experimental groups II, III and IVwere fed the basal diet supplemented with 0.1%, 0.2% and 0.4% compound probiotics. The results of this work were as follows: (1) during the experimental period, compared with control group, the average daily in group III was significantly increased (P<0.05), the feed/gain and average daily feed intake were significantly lower (P<0.05); (2) at the age of 14 and 28 days, the number of cecal Lactic acid in group II and III were significantly higher than the control (P<0.05) and the content of E.coli has the opposite results. (3) the anti-body titer in group III was the highest, and significantly higher compared to the control (P<0.05), but there were no significantly differences between group IV and control group (P>0.05). (4) serum biochemical indexes of broilers in group III and IVwere significantly increased than that in control group (P<0.05). In conclusion, the supplementation of 0.2% compound probiotics could promote the growth performance, improve the cecal mico-ecosystem, enhance the anti-body titer and biochemical indexes in serum.

scholarly journals 14. Effect of Dietary Supplementation of Garlic (Allium Sativum) and Turmeric (Curcuma Longa) on Growth Performance, Carcass Traits, Blood Profile and Oxidative Status in Growing Rabbits

2016 ◽  
Vol 16 (2) ◽  
pp. 489-505 ◽  
Author(s):  
Mahmoud Alagawany ◽  
Elwy Ali Ashour ◽  
Fayez Mohamed Reda
Keyword(s):  
Growth Performance ◽  
Control Diet ◽  
Carcass Traits ◽  
Dietary Supplementation ◽  
Basal Diet ◽  
Rabbit Serum ◽  
Control Group ◽  
Antioxidant Enzyme Activities ◽  
Growth Promoter ◽  
Blood Profile

Abstract This study was performed to investigate the effects of dietary supplementation with garlic and turmeric powder as growth promoter agents on performance, carcass traits, serum biochemistry, and antioxidant enzyme activities of growing rabbits. A total of 112 New Zealand White rabbits (NZW) at 5 weeks of age were randomly assigned to seven treatments with four replicates. The dietary treatments consisted of 7 groups as follows; the basal diet as control, phytogenic additives groups were supplemented with 2, 4, and 6 g/kg garlic or turmeric powder added to the basal diet. There were no linear and quadratic differences (P<0.05) in growth performance after garlic or turmeric supplementation at all studied ages. Compared with the control group, supplementation of diets with garlic or turmeric linearly and quadratically elevated immunity biomarkers such as total protein (TP), albumin (AL) and immunoglobulin (IgG) levels and decreased (linearly and quadratically, P<0.05) aspartate aminotransferase (AST), alanine aminotransferase (ALT ), triglyceride (TG) and total cholesterol (TC) levels in rabbit serum. However, TP, AL, globulin (GL), IgG and IgM levels were linearly and quadratically enhanced with increasing turmeric levels versus the control diet. Hepatic superoxide dismutase (SOD), catalase (CAT ) and glutathione peroxidase GSH-Px activities as well as reduced glutathione (GSH) concentrations were linearly and quadratically (P<0.05) improved in garlic or turmeric additives fed groups. While MDA concentration was statistically (linearly, P= 0.022) reduced in comparison with the control group. It could be concluded that garlic or turmeric supplementation (2, 4 and 6 g/kg) did not linearly and quadratically affect growth performance but improved the immunity responses and lowered the lipid profile in blood and lipid peroxidation in liver and increased hepatic antioxidant activity in treated rabbits.

scholarly journals Administration of garlic and neem in broiler diet for safe meat production

2020 ◽  
Vol 48 (2) ◽  
pp. 116-126
Author(s):  
R Islam ◽  
MM Hossain ◽  
F Nargis ◽  
ME Hossain
Keyword(s):  
Body Weight ◽  
Basal Diet ◽  
Feed Additives ◽  
The Body ◽  
The Other ◽  
Control Group ◽  
Meat Production ◽  
Broiler Chicks ◽  
Treatment Groups ◽  
Broiler Production

This study was conducted to observe the effect of different administration method of garlic and neem on growth performances, feed efficiency and serum biochemical parameters for safe broiler production. The experiment was done for a period of 32 days with 384 one-day-old straight run broiler chicks. The broiler chicks were divided into six groups each of 64 birds and replicated to four subgroups each of 16 birds. The dietary groups were; control (basal diet; no additives), antibiotic (basal diet + antibiotic), garlic in feed (basal diet + 0.25% garlic powder), garlic in water (basal diet + garlic extracts), neem in feed (basal diet + 0.25% neem powder) and neem in water (basal diet + neem extracts). Results showed that the body weight and body weight gain increased significantly (P<0.05) in both the garlic and neem groups compared to the control group. Feed intake was not different (P>0.05) among the treatment groups. Garlic in feed and water and neem in feed groups showed better FCR (P<0.05) compared to the other treatment groups. There were no significant (P>0.05) difference in meat yield, bone development and dressing parameters except head and gizzard in different dietary groups. Supplementation of garlic with feed and water significantly (P<0.05) decrease cholesterol, triglyceride and LDL compared to the other groups. However, both the garlic and neem groups showed numerically higher HDL compare to the control group. There were no 0significant (P>0.05) differences in serum glucose and GPT among different treatment groups. GOT was significantly (P<0.05) lower in neem groups than that of garlic and antibiotic groups. Additive groups showed higher profitability than control group. Based on the results of the study, it may be suggested that the garlic and neem could be used both in feed and water as potential feed additives for safe broiler production. Bang. J. Anim. Sci. 2019. 48 (2): 116-126

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