Abbreviations
APC: apple cider vinegar
RBC: red blood cell
WBC: white blood cell
TP: total protein
PCV: packed cell volume
Hb: Hemoglobin
IgG: immunoglobulin G
Introduction
Apple cider vinegar (ACV) is a fermented compound that contains acetic acid, flavonoids, phenolic compounds, organic acids, minerals, and vitamins [ 1 , 2 ]. ACV is produced through a two-stage fermentation process. First, the sugar is converted into alcohol by yeasts, then the alcohol is converted into acetic acid by acetic acid bacteria [ 3 ].
Animal experiments have reported that ACV has a variety of pharmacological activities, including antioxidant, anti-inflammatory, anti-diabetic, antifungal, antimicrobial, anti-hypertensive, and anti-hyperlipidemic actions [ 4 - 8 ]. A study showed that using ACV in a fish diet improves immunological parameters and gene expression related to immunity, antioxidant system, and growth performance [ 9 ]. Also, a study showed that using ACV in a fish diet increases total immunoglobulin and lysozyme activity [ 10 ]. In addition, a study has reported that dietary supplementation with ACV has beneficial effects on performance and immune response in broiler chickens [ 11 ]. It has been shown that ACV has an anthelmintic impact against gastrointestinal parasites in sheep [ 12 ], and increases the activity of antioxidant enzymes such as superoxide dismutase, catalase, and glutathione peroxidase [ 13 ].
Vitamin A is known as an anti-inflammation vitamin because of its critical role in enhancing immune function [ 14 ]. Vitamin A is involved in the development of the immune system and plays regulatory roles in cellular immune responses and humoral immune processes [ 14 ].
Thus, the aim of this study was to assess the effect of ACV and vitamin A on hematological parameters and immunoglobulin G in Gezel lambs.
Result
By administering ACV and Vitamin A at the mentioned doses, no disorders and lesions have occurred in the lambs.
ACV
RBC, PCV, Hb, fibrinogen, TP, neutrophils, band neutrophils, eosinophils, and monocytes in lambs before and after administration of ACV were not statistically different.
WBC, lymphocytes, and IgG in lambs were significantly higher after administration of ACV compared to the control group (p < 0.05).
RBC, PCV, Hb, fibrinogen, TP, WBC, neutrophils, band neutrophils, eosinophils, and monocytes were not statistically different between lambs under oral administration of ACV and lambs in the control group.
IgG and lymphocytes were significantly higher in lambs under oral administration of ACV than in lambs in the control group (P<0.05).
The results of the study are summarized in Tables 1 and 2.
Parameter | A day before study | A day after study | P value | ||||
---|---|---|---|---|---|---|---|
Min | Max | Mean ±SE | Min | Max | Mean ±SE | ||
Case group under vitamin A injection | |||||||
RBC (104/μl) | 1025 | 1190 | 1105 ± 47.69 | 1125 | 1155 | 1142 ± 9.06 | 0.464 |
PCV (%) | 30 | 35 | 32.67 ± 1.45 | 33 | 34 | 33.34 ± 0.33 | 0.635 |
Hb (g/dl) | 10 | 11.66 | 10.88 ± 0.48 | 11 | 12 | 11.44 ± 0.29 | 0.336 |
TP (g/dl) | 6.2 | 6.66 | 6.42 ± 0.13 | 6.4 | 7.1 | 6.67 ± 0.21 | 0.134 |
Fibrinogen (mg/dl) | 100 | 200 | 166.7 ± 33.34 | 100 | 400 | 266.7 ± 88.2 | 0.225 |
WBC/μl | 4446 | 10349 | 7248.4 ± 1710 | 8511 | 14150 | 10917.7 ± 1679.3 | 0.006* |
Neutrophil /μl | 1269 | 3895 | 2421.4 ± 774.9 | 4514 | 5382 | 4898.7 ± 255.3 | 0.041* |
Band neutrophil/μl | 30 | 100 | 66.7 ± 20.2 | 112 | 207 | 143.7 ± 31.7 | 0.055 |
Lymphocyte/μl | 2976 | 5842 | 4439.4 ± 827.89 | 3519 | 7320 | 5113 ± 1139.2 | 0.259 |
Eosinophil /μl | 124 | 307 | 200.4 ± 54.96 | 244 | 724 | 449.4 ± 142.8 | 0.105 |
Monocyte/μl | 47 | 205 | 120.7 ±45.9 | 122 | 517 | 313 ±114.2 | 0.107 |
IgG (g/l) | 1.19 | 1.30 | 1.24 ± 0.031 | 1.34 | 1.40 | 1.36 ± 0.018 | 0.020* |
Case group under oral administration of ACV | |||||||
RBC (104/μl) | 952 | 1260 | 1128 ± 76.03 | 982 | 1342 | 1143 ± 74.95 | 0.804 |
PCV (%) | 28 | 37 | 32.7 ± 1.89 | 29 | 40 | 35.5 ± 2.39 | 0.102 |
Hb (g/dl) | 9.33 | 12.33 | 10.9 ± 0.61 | 9.6 | 13.33 | 8.5 ± 2.4 | 0.470 |
TP (g/dl) | 5.7 | 6.5 | 6.25 ± 0.18 | 6.1 | 7.4 | 6.52 ± 0.29 | 0.340 |
Fibrinogen (mg/dl) | 100 | 300 | 187.5 ± 42.6 | 100 | 100 | 100 ± 0 | 0.133 |
WBC/μl | 3330 | 8702 | 5242 ± 1187.5 | 5458 | 12470 | 8811.5 ± 1459.2 | 0.01* |
Neutrophil /μl | 1239 | 2790 | 1732.2 ± 356.6 | 910 | 4810 | 3005 ± 813.1 | 0.105 |
Band neutrophil/μl | 62 | 80 | 67.7 ± 4.2 | 60 | 100 | 80 ± 8.16 | 0.091 |
Lymphocyte/μl | 1909 | 5460 | 3217.2 ± 780.1 | 4250 | 6900 | 5337.5 ± 571.3 | 0.007* |
Eosinophil/μl | 80 | 186 | 121.5 ± 22.9 | 130 | 400 | 232.5 ± 58.36 | 0.053 |
Monocyte/μl | 40 | 186 | 104 ± 30.8 | 108 | 260 | 156.5 ± 35.8 | 0.063 |
IgG (g/l) | 1 | 1.25 | 1.08 ± 0.059 | 1.55 | 1.90 | 1.73 ± 0.074 | 0.001* |
Control group | |||||||
RBC (104/μl) | 1021 | 1184 | 1118.4 ± 49.7 | 1187 | 1274 | 1220 ± 27.09 | 0.096 |
PCV (%) | 30 | 35 | 33.4± 1.7 | 35 | 38 | 36 ± 1 | 0.208 |
Hb (g/dl) | 10 | 11.66 | 11 ± 0.54 | 11.66 | 12.66 | 12.1 ± 0.293 | 0.107 |
TP (g/dl) | 5.8 | 6.6 | 6.3 ± 0.25 | 6.8 | 7.3 | 6.97 ± 0.16 | 0.081 |
Fibrinogen (mg/dl) | 150 | 300 | 200 ± 50 | 200 | 300 | 266.7 ± 66.7 | 0.181 |
WBC /μl | 3851 | 9960 | 6722.7 ± 1772.96 | 5484 | 7400 | 6561.4 ± 565.8 | 0.909 |
Neutrophil /μl | 1692 | 3840 | 2677.4 ± 626.3 | 2557 | 3040 | 2765.7 ± 143.2 | 0.872 |
Band neutrophil /μl | 47 | 60 | 51.4 ± 4.3 | 40 | 70 | 53.4 ± 8.8 | 0.724 |
Lymphocyte/μl | 1909 | 5460 | 3623 ± 1026.9 | 2500 | 3750 | 3283.4 ± 394.05 | 0.675 |
Eosinophil/μl | 141 | 360 | 217 ± 71.5 | 232 | 340 | 274 ± 33.4 | .278 |
Monocyte /μl | 62 | 240 | 154 ± 51.4 | 155 | 200 | 185 ± 15 | 0.507 |
IgG (g/l) | 1.18 | 1.25 | 1.2 ± 0.023 | 1.20 | 1.29 | 1.24 ± 0.026 | 0.225 |
*P< 0.05, RBC: red blood cell, PCV: packed cell volume, Hb: hemoglobin, TP: total protein, WBC: white blood cell, IgG: immunoglobulin G, min: minimum, max: maximum, SE: standard error. |
Parameter | Case group under vitamin A injection | P value | Control group | P value | Case group under oral administration of ACV | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Min | Max | Mean ± SE | Min | Max | Mean ± SE | Min | Max | Mean ± SE | |||
RBC(104/μl) | 1125 | 1155 | 1142.7 ± 9.06 | 0.053 | 1187 | 1274 | 1220.4 ± 27.09 | 0.440 | 982 | 1342 | 1143± 74.9 |
PCV (%) | 33 | 34 | 33.4 ± 0.33 | 0.065 | 35 | 38 | 36 ± 1 | 0.872 | 29 | 40 | 35.5 ±2.39 |
Hb (g/dl) | 11 | 12 | 11.44 ± 0.29 | 0.186 | 11.66 | 12.66 | 12.1 ± 0.29 | 0.560 | 9.6 | 13.33 | 11.51± 0.77 |
TP (g/dl) | 6.4 | 7.1 | 6.67 ± 0.21 | 0.413 | 6.8 | 7.3 | 6.8 ± 0.06 | 0.383 | 6.8 | 7.4 | 6.52 ±0.29 |
Fibrinogen (mg/dl) | 100 | 400 | 266.7 ± 88.19 | 0.742 | 200 | 400 | 233.4 ± 33.4 | 0.057 | 100 | 100 | 100 ± 0 |
WBC/μl | 8511 | 14151 | 10917.7 ± 1679.3 | 0.070 | 5484 | 7400 | 6561 ± 565.8 | 0.808 | 1270 | 9320 | 6011.5 ± 1772 |
Neutrophil/μl | 4514 | 5382 | 4898.7 ± 255.3 | 0.002* | 2557 | 3040 | 2765.7 ± 143.2 | 0.815 | 910 | 4810 | 3005 ± 813.1 |
Band neutrophil/μl | 112 | 207 | 143.7 ± 31.7 | 0.051 | 40 | 70 | 53.4 ± 8.8 | 0.080 | 60 | 100 | 80 ±8.1 |
Lymphocyte/μl | 3519 | 7320 | 5113 ± 1139.2 | 0.204 | 2500 | 3750 | 3283 ± 394.05 | 0.041* | 4250 | 6900 | 5337.5 ± 571.3 |
Eosinophil/μl | 244 | 724 | 449.4 ± 142.8 | 0.298 | 232 | 340 | 274 ± 33.4 | 0.601 | 130 | 400 | 232.5 ± 58.3 |
Monocyte /μl | 122 | 517 | 313 ± 114.2 | 0.329 | 155 | 2 | 185 ± 15 | 0.548 | 108 | 260 | 156.5 ± 35.8 |
IgG (g/l) | 1.34 | 1.40 | 1.36 ± 0.018 | 0.022* | 1.25 | 1.29 | 1.24 ± 0.026 | 0.004* | 1.55 | 1.90 | 1.73± 0.07 |
*P< 0.05, RBC: red blood cell, PCV: packed cell volume, Hb: hemoglobin, TP: total protein, WBC: white blood cell, IgG: immunoglobulin G, min: minimum, max: maximum, SE: standard error. |
Vitamin A
RBC, PCV, Hb, fibrinogen, TP, band neutrophils, lymphocytes, eosinophils, and monocytes in lambs before and after administration of vitamin A were not statistically different.
WBC, neutrophils, and IgG were significantly higher in lambs after vitamin A administration compared to the control group (p < 0.05).
RBC, PCV, Hb, fibrinogen, TP, WBC, band neutrophils, lymphocytes, eosinophils, and monocytes were not statistically different between lambs under vitamin A injection and lambs in the control group.
Neutrophils and IgG levels were significantly higher in lambs under vitamin A injection than in the control group (p < 0.05).
The results of the study are summarized in Tables 1 and 2.
Discussion
A study on the effects of ACV on haemato-biochemical parameters in rate showed that there are no significant variations between the groups in post-treatment values of PCV, Hb, RBC, and absolute eosinophil counts [ 15 ]. In our study, these mentioned parameters were not different before and after administration of ACV and also they were not different between the test article groups and the control group. Also, another study found no difference in RBC between control and case groups after adding a combination of onion, garlic, and ACV to broiler chicken diets[ 16 ]. A study showed that there is no significant impact of ACV supplementation on broiler serum total protein levels[ 17 ]. This finding is similar to our finding. Also, a study showed that ACV has no effect on RBC, Hb, and PCV in humans [ 18 ]. The same results are presented in our study.
A study on the effects of an herbal mixture (onion, garlic, and ACV) on hematological parameters of broiler chickens showed that the herbal mixture resulted in significant increases in PCV and Hb values[ 16 ]. This finding is contrary to our results, and probably the results obtained in the mentioned study were not caused by the effect of ACV, or maybe the difference between the results of our study and that study is due to differences between species.
In our study, the significant increase in WBC count after the administration of ACV was mainly due to the substantial increase in lymphocyte count. However, the significant increase in the lymphocyte count in the ACV-administered group compared to the control group did not lead to an increase in WBC count in the ACV-administered group compared to the control group. A study showed that the addition of an herbal mixture (onion, garlic, and ACV) to the diet of broiler chickens increased lymphocyte counts [ 16 ]. The improvement of the immune system due to the administration of ACV has been mentioned in several studies.. Since lymphocytes play a role in humoral immunity, perhaps the improvement of the immune system caused by ACV is responsible for the increase in lymphocytes. However, this requires further study.
In our study, it was shown that immunoglobulin G increased after the administration of vitamin A and ACV. It also increased in the ACV and vitamin A-administered group compared to the control group. These findings show that vitamin A and ACV (as mentioned above) are useful in improving the immune system in lambs. An increase in total immunoglobulin has been reported in fish after administration of ACV [ 10 , 20 , 21 ]. In a study, it was shown that administration of vitamin A leads to an
Materials and Methods
Selection of lambs, grouping and sampling
To perform this study, ten healthy male Gazel lambs were selected. Their health was confirmed by veterinary examinations. The age (6 months) and weight (20 kg) of the selected lambs were similar. Before starting the study, the selected lambs underwent a week of adaptation to the new environment. During the study, lambs were fed alfalfa and hay ad libidum and were observed for any clinical signs of disease throughout the study.
The lambs were randomly grouped into three groups:
1- Control group: 3 lambs were assigned to this group, and no medication was administered to them.
2- Case group under vitamin A injection: 3 lambs were assigned to this group and vitamin A was administered to them (44,000 IU/kg Retinavit®, intramuscularly (IM), every ten days, 4 treatments).
3- Case group under oral administration of ACV: 4 lambs were assigned to this group, and ACV was administered orally by drenching (0.5 ml/kg of 6% ACV solution (600 mg ACV), every day, for 40 days).
Blood samples were taken from the jugular vein of all lambs before and after the study.
Laboratory measurement
Red blood cell (RBC) count, packed cell volume (PCV), hemoglobin (Hb), fibrinogen, total protein (TP), white blood cell (WBC) count, and absolute count of neutrophils, band neutrophils, lymphocytes, eosinophils, and monocytes were determined by routine hematology tests.
Total immunoglobulin G (IgG) concentration was assayed by turbidimetric immunoassay method as previously described [ 25 , 26 ].
Statistical analysis
The data obtained before and after drug administration were analyzed by paired T-Test in SPSS software. Also, the data of different groups were analyzed using the independent-sample t-test. p < 0.05 was considered significant.
Conclusion
Administering vitamin A and ACV in sheep is safe. They also improve the immune system. Vitamin A and ACV increase total IgG, and also vitamin A increases neutrophils and ACV increases lymphocytes. In general, they can be used to improve the immune system in sheep.
Authors' Contributions
Conceived and designed the experiments: M.T., and E.F. Performed the experiments: M.T., and M.A..Wrote the paper: A .Sh.
Acknowledgements
The authors would to express their gratitude to Research Vice-Chancellor of University of Tabriz for their financial support.
Competing Interests
The authors declare that there is no conflict of interest.
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