Table 1 showed that the
Whitfieldia lateritia leaf decoction contained an appreciable amount of the following phytochemicals: flavonoids, saponins, tannins cardiac glycosides and steroid. This observation is in line with the work of
Aja et al., (2016) who had observed similar phytochemicals in ethanol extract of
Whitfieldia lateritia leaf. These bioactive compounds are biochemically active in many respects; eliciting different arrays of biochemical activities (enzyme activation/inactivation, antioxidant activities
etc.). Flavonoids have been reported to possess antibacterial property as they can associate with soluble proteins and bacterial cell walls
(Doss et al., 2011). They also have antioxidant property as they inhibit oxidative stress by mitigation of the generation of free radicals, exhibit anti-inflammatory and anti-cancerous activity
(Liu et al., 2008; Alsabri et al., 2013). Flavonoids protect against ultraviolet radiation, pathogens and pests. Saponins have antimicrobial activity
(Rohit et al., 2012); interfere with the replication of cell DNA thereby preventing the multiplication of cancer cells
(Rohit et al., 2012). Tannins have antimicrobial, antidiarrheal, anti-inflammatory and antioxidant activities. Cardiac glycosides are used for the treatment of cardiac failure. Steroids are precursors of sex hormones (
Ajiboye, 2013).
Fig 1 variations in weight gain of anemic cockerels treated with
W. lateritia leaf decoction and vitali supplement. Weight variations in animals stem from combinatorial factors ranging from impaired feed intake and utilization as well as possible alteration of hormones responsible for animal growth and development. The actions that can produce these effects are increased salivary gland secretion, stimulation of mucus secretion in the stomach and intestine thus, improving nutrient status
(Costa et al., 2018).
Fig 2 variations in blood glucose concentration of cockerels treated with of
W. lateritia leaf decoction and vitali supplement. The blood glucose concentration in the test groups relatively compared with the normal control but was significantly higher (P<0.05) than the negative control (T11) and baseline control (T12). The observed decrease of the blood glucose in the negative control (T11) and baseline control (T12) suggest that upon the induction of anemia, there was a possible decrease in feed intake as well as metabolic alterations in the cockerels or perturbation of the glucose metabolizing system, such as impaired insulin release or function. However, normal glucose level was restored in the anemic groups while alteration of blood glucose did not occur in the non-anemic groups, suggesting that the extract did not alter glucose metabolism and also could have contributed in protecting the membrane integrity of the pancreas maintaining insulin release thus, increasing glucose absorption by muscle and fat tissues and prevention of glucose production from liver cells
(Mangoyi et al., 2017, Kooti et al., 2016). Decrease blood glucose as seen in T4 could occur as a result of inhibition of glucose absorption from the intestine, increase in glucose transport from the blood into the cell
(Mangoyi et al., 2017).
Table 2. variations of blood parameters in phenylhydrazine-induced anemic cockerels. The white blood cells, monocytes and neutrocytes were decreased (p<0.05) in the negative and baseline control when compared with the anemic and non-anemic test groups and the normal control. The red blood cells and the hemoglobin were increased significantly (p<0.05) in the test groups when compared with the normal control and the baseline control except the negative control which was significantly increased (P<0.05). The packed cell volume was increased in the test groups than the baseline control but lower than the negative control. The platelets levels were significantly (P<0.05) increased in the baseline control than the anemic and the non-anemic groups (Table 2). The white blood cells, monocytes and neutrocytes which were decreased in the negative and baseline control where restored in the treatment groups indicating positive bio-activities of the plant components and ingredients in the vitali supplements. The production WBC is regulated by hematopoietic regulatory elements. Granulocytes-macrophage colony stimulation factor, interleukins (IL-2, IL-4 and IL-5) regulated proliferation, differentiation and maturation of the committed stem cells responsible for the production of WBCs
(Jorum et al., 2016). Decrease in WBC counts can be as a result of viral infections, medications like antibiotics, inflammatory cells, malnutrition and vitamin deficiencies
(Lewicki et al., 2014). RBC was increased (p<0.05) in the test groups when compared with the normal control and baseline control. The observed decrease in the baseline control could be due to the toxicity of the phenylhydrazine by the involvement of by-products (anyl and hydroxyl) radicals that it generates
(Nku-Ekpang et al., 2015). The observed increase in the red blood cells and hemoglobin could be due to phytochemical constituents in the decoction and specific of minerals and vitamins in the supplement. Hematopoietic factors that have direct influence on the production of blood in bone marrow
(Nku-Ekpang et al., 2015). The bio-components of the plant leaves could have (1) increased red blood cells counts by inhibition of lipid peroxidation [An indicator of oxidative stress
(Prateek et al., 2021)] of the red blood cell membrane lipids (2) stimulated erythropoiesis, possibly, by increasing erythropoietin
(AL-Jarah et al., 2017). The packed cell volume (PCV) of the test groups were significantly altered (P<0.05) when compared to the normal control. A decreased
PCV generally connotes RBCs due to loss from blood destruction or loss and failure of bone marrow production. While increased
PCV generally suggests dehydration or an abnormal increase in red blood cell production. The platelets count was significantly (p<0.05) decreased in the anemic and the non-anemic test groups treated with decoction and vitali supplement when compared with the baseline control but higher than the negative control. Platelets are blood cells involved in blood clothing
(Jorum et al., 2016).
Fig 3 variations in calcium and potassium levels of cockerels treated with
W. lateritia leaf decoction and vitali supplement. The calcium and potassium were significantly increased in the anemic and non-anemic groups treated with decoction as well as the groups treated with vitali supplement (VS) when compared with the baseline control. However, both groups compared well with normal control (Fig 3). Our finding on the serum calcium concentration was in agreement with the work of
Florence et al., (2017) who reported an increase on the serum calcium levels of wistar rats fed with aqueous leaf extract of
Peperomia pellucid. Although, hypercalcemia could result from overactive parathyroid glands with the manifest kidney diseases such as kidney stone
(Craven et al., 2008). The potassium concentrations among the test groups generally compared with the normal control. This is an indication that the treatment was able to restore the potassium decrease due to the induction of anemia with phenylhydrazine (see T12-baseline control). The work of
Ahmad et al., (2015) had shown that certain plant could increase serum potassium. Potassium has been shown to have a protective effect against hypertension by attenuating cardiac output through natriuresis
(Toshiro et al., 1984). The Na
+- K
+ ATPase maintains K
+ balance. Serum k
+ is controlled by three mechanisms: intake, distribution between intracellular and extracellular fluids and renal excretion. Cellular distribution is affected by insulin and beta-adrenergic receptors that stimulate the activation of Na
+/K
+ ATPase. Adjustments in potassium levels may affect membrane potential and serum pH (
Aronson and Giebish, 2011). Changes in serum potassium result in an inverse change in the serum pH (
Aronson and Giebish, 2011;
Alexander et al., 2001).
Fig 4 variations in bicarbonate, sodium and chloride levels of cockerels treated with
Whitfieldia lateritia leaf decoction and vitali supplement. There was no significant difference (P>0.05) in the bicarbonate and chloride concentrations between the test groups, normal control and negative control except T4 that was treated with 400 mg decoction only, which decreased significantly (p<0.05). Sodium concentration was significantly decreased in the test groups treated with 200 mg and 400 mg vitali supplement when compared with the normal control, negative control and baseline control. Sodium levels of both the anemic and non-anemic groups were lower (p<0.05) than the negative and baseline control (Fig 4). The lower H
2CO-
3 reported for T4 which received 400mg/kg bodyweight of decoction might be due to the bioactive components ability to trigger the elevation of the pH leading to the depletion of H
2CO-
3 to mitigate the metabolic acidosis. When the bicarbonate levels are decreased or increased, it suggests that the body‘s acid-base regulation is impaired with the manifest loss or retention of fluid
(Ujowundu et al., 2015, Ali
Fredrick et al., 2015). Bicarbonate is a primary acid-base buffer in the body and the values recorded in the current study is within the bicarbonate range (23-29meq/L) required for the assessment of acid-base balance. Decreased sodium recorded in this study for non-anemic rats of the decoction treated groups might be attributed to the inhibitory action of the extract on anti-diuretic hormone leading to the kidney passing more water directly to the bladder without sodium reabsorption. Hyponatremia may be caused by impaired production of antidiuretic hormones (Ali
Fredrick et al., 2015) while increased sodium observed in the baseline control could be due to increased urinary excretion imposed on renal resistance to vasopressin (
Palevsky, 1996) attributable to the induction of anemia. The observed non-variation (p>0.05) in chloride concentration suggest non- interference by the active components of the plant. Chloride is the major extracellular anion and its normal serum concentrations range from 96 to 106 mEq/L (
Gail, 1990) It is important in water distribution, osmotic pressure, anion-cation balance (
Augustine, 2015).