Research Article

Studies on Haematological and some Serum Biochemical Changes by Oral Administration of Gossypol from Cotton Seed Cake in Rabbits

Altaf Mahmood1*, Muhammad Athar Khan2, Saima Parveen3, Tanveer Hussain4 and Ayesha Azad5

1Directorate of Animal Disease Diagnostic, Reporting and Surveillance, Livestock and Dairy Development Department, Govt. of Punjab, Chakwal, Pakistan; 2Department of Epidemiology and Public Health, University of Veterinary and Animal Sciences, Lahore, Pakistan; 3Department of Biology, Faculty of Science and Technology, Virtual University of Pakistan, Lahore, Pakistan; 4Department of Molecular Biology and Biotechnology, Faculty of Science and Technology, Virtual University of Pakistan, Lahore, Pakistan; 5Poultry Research Institute, Livestock and Dairy Development Department, Govt. of Punjab, Pakistan.

Received | April 18, 2021; Accepted | August 15, 2021; Published | January 31, 2022

*Correspondence | Altaf Mahmood, Directorate of Animal Disease Diagnostic, Reporting and Surveillance, Livestock and Dairy Development Department, Govt. of Punjab, Pakistan; Email: [email protected]

Citation | Mahmood, A., M.A. Khan, S. Parveen, T. Hussain and A. Azad. 2022. Studies on haematological and some serum biochemical changes by oral administration of gossypol from cotton seed cake in rabbits . Sarhad Journal of Agriculture, 38(2): 417-421.

DOI | https://dx.doi.org/10.17582/journal.sja/2022/38.2.417.421

Keywords | Gossypol toxicity, Anaemia, Hypophosphataemia, Haematological alterations, Serum inorganic phosphorous

Introduction

Cotton seed cake is among major component of livestock feed in cotton growing areas. Despite being a potential protein source, its usage is confined because of gossypol (C30H30O8), a naturally occurring polyphenolic dialdehyde present mostly in pigment gland of the cotton plant and provide protection against the insect damage (Datta et al., 2017). Free form of gossypol is toxic whereas no toxicity has been associated with its bounded form. Its toxic effects have been recorded in non-ruminants and ruminants (Gadelha et al., 2014). Ruminants have however the ability to detoxify the free gossypol concentration by binding it with ruminal microbial proteins (Rehemujiang et al., 2019). But this ability is reduced when gossypol intake exceeds rumen detoxification capacity (Morgan, 2015). According to recommendations of European Food Safety Authority (EFSA), maximum permitted level (MPL) of gossypol for dairy cattle is 130mg/kg diet or 4.4mg/kg body weight per day. Subclinical erythrocyte fragility is recorded in dairy cattle at dose level of 13 & 18mg/kg body weight (Knusten et al., 2017). Gossypol inhibits erythropoiesis by binding with iron. Gossypol iron complex is formed rendering iron unavailable for absorption leading to iron deficit and consequently anaemia (Chen et al., 2016). Gossypol also increases erythrocyte fragility and stimulates erythropoiesis by enhancing cystosolic Ca2+ activity leading to cell membrane scrambling, contraction and haemolysis (Tang et al., 2017). This experiment was designed to explore the haematobiochemical aspects of gossypol toxicity in female rabbits.

Materials and Methods

Experimental animals

A group of commercially raised eight female rabbits of six months age was reared at university of veterinary and animal sciences Lahore for a period of sixty days. Fresh spinach, cucumber carrots and cabbage were fed to them with adequate quantity of clean water. Cotton seed cake having 0.25% free gossypol content was orally administered to each rabbit daily at the rate of 4 grams per kg live weight for a period of 60 days.

Quantification of free gossypol in cotton seed cake

Free gossypol content in cotton seed cake was quantified according to official method ba-7-58 recommended by society of American oil chemists (Karishma et al., 2016). Five solutions were prepared for use in this method including 70% aqueous acetone (700ml reagent grade acetone & 300ml distilled water); 80% aqueous isopropyl alcohol (800ml reagent grade isopropyl alcohol & 200ml distilled water); 10% thiourea (10 grams reagent grade thiourea in distilled water making it to 100ml); 1.2% hydrochloric acid (106ml of concentrated hydrochloric acid/37% & distilled water to a volume of 1000ml) and Gossypol standard solution for free gossypol. For preparation of gossypol standard solution, 27.9 mg of primary standard quality gossypol acetic acid, 100ml reagent grade acetone, 50ml reagent grade acetic acid glacial and 75ml distilled water were added in 250 ml volumetric flask and then diluted to the volume with reagent grade acetone. 50 ml of the solution was then placed in 250ml volumetric flask to which 100ml reagent grade acetone and 60ml distilled water were added, diluted to the volume with reagent grade acetone and thoroughly mixed. This standard solution contained 0.025mg gossypol per ml and was stable for 24 hours if prevented from sunlight exposure.

2 grams of ground cotton seed cake was placed in 250ml Erlenmeyer flask whose bottom was covered with glass beads. 50 ml of 70% aqueous acetone solution was added; flask was stoppered with an air tight proof glass stopper and shaken for one hour on mechanical shaker. Mixture was then filtered using filter paper of medium retentively. First 5 ml was discarded and remaining filtrate was collected in 100 ml Erlenmeyer flask. 10 ml of two aliquots were separately pipetted into 25 ml volumetric flasks designated as A and B. 2 ml of aniline, 2 drops of 10%thiourea and 10ml of 70% aqueous acetone were then pipetted into another 25 ml volumetric flask designated as C which was used as reagent blank. In flask A, one drop of 1.2 N hydrochloric acid solution and 0.10 ml of 10% thiourea were added and diluted with 80% isopropyl alcohol to the volume. In flask B, 2 ml aniline, two drops of 10% thiourea and one drop of 1.2 N hydrochloric acid solutions were added. Flask B and C were placed in water bath for 30 minutes at 100C○. Ten ml of 80% aqueous isopropyl alcohol was added to both flasks after removing them from water bath. Flasks were then cooled to room temperature using another water bath and 80% aqueous isopropyl was added to dilute their contents to the volume. Absorbance of A was estimated at 440 nm using 80% isopropyl alcohol to adjust the spectrophotometer at zero absorbance. Absorbance of B was estimated at 440 nm using C to adjust the instrument at zero absorbance. Corrected absorbance was calculated as under:

Corrected Absorbance = Absorbance of solution B – Absorbance of solution A

Calibration

Two sets of standard gossypol aliquots of 2, 4, 6, 8 and 10 ml were pipetted into 25 ml volumetric flasks designated as A & B. 10 ml of 70% aqueous acetone solution was pipetted into 25 ml volumetric flask to which 2ml aniline and two drops of 10% thiourea were added and designated as C to use as reagent blank. One drop of 1.2 N hydrochloric acid and two drops of 10% thiourea were added into A and then diluted to the volume with 80% aqueous isopropyl alcohol. Into B, 2 ml aniline, two drops of 1.2 N hydrochloric acid and two drops of 10% thiourea solution were added. B and C were placed in water bath at 100C○ for half hour, allowed to cool to room temperature, cooled to room temperature and 80% was then added to the volume. Absorbance of A & B was determined using C as blank whereas corrected absorbance for both gossypol standard aliquots was calculated as described above. For each gossypol standard, corrected absorbance

 

Table 1: Haematological and biochemical values of rabbits before (on day 0) and after gossypol administration.

Parameters	Mean ± S.D.					P – value
	Day 0	Day 15	Day 30	Day 45	Day 60
Red blood cells (106/µL )	6.68 ± 0.47	6.28 ± 0.297	5.80 ± 0.19	5.76 +0.08	5.36 ± 0.12	0.0000
Haemoglobin (g/dL)	11.8±1.30	11.06±0.26	10.37±0.45	9.77±0.37	9.40±0.11	0.000
Haematocrit (% )	36.29±4.15	33.02±1.05	30.56±1.91	28.84±0.83	28.41±0.94	0.0000
Mean corpuscular volume (fL)	54.1±2.73	51.9±1.06	50.49±1.18	49.4±1.17	48.74±0.88	0.000
Mean corpuscular haemoglobin (pg)	17.46±0.88	17.66±0.64	17.92±0.45	18.2±0.40	18.26±0.23	0.033
Mean corpuscular haemoglobin concentration (g/dL)	32.28±1.47	33.56±0.83	34.66±0.90	35.29±0.96	36.18±0.74	0.000
Red cell distribution width (%)	17.33±0.79	18.1±1.16	18.75±1.088	19.58±0.88	20.1±0.78	0.000
White blood cells (103/µL)	3.43±1.53	4.45±0.42	4.58±0.52	4.67±0.48	4.69±0.48	0.008
Lymphocytes (103/µL)	2.70±1.06	3.71±0.86	3.97±0.53	4.30±0.43	4.45±0.44	0.000
Monocytes (109/L)	0.03±0.014	0.04±0.02	0.05±0.02	0.05±0.02	0.05±0.02	0.002
Granulocytes (103/µL)	0.71±0.59	0.7125±0.97	0.715±0.96	0.71±0.97	0.71±0.98	0.967
Calcium (mmole /L)	3.446±0.07	3.4176±0.06	3.44±0.05	3.42±0.06	3.4176±0.08	0.866
Phosphorous (mg/dL)	3.81±0.03	3.72±0.049	3.725±0.06	3.715±0.06	3.71±0.06	0.012

 

was plotted against mg of gossypol in 25ml in order to obtain a linear calibration graph which was then used to calculate a factor for computing mg of gossypol in the sample aliquots.

For all gossypol standards, average factor was calculated and mg gossypol in sample was determined by multiplying the calibration factor with sample aliquot’s corrected absorbance. Percentage of free gossypol in sample aliquot was determined as mentioned below:

G = Quantity of gossypol (mg) in sample aliquot; W is sample weight in grams and V is volume of sample aliquot.

Collection and processing of specimens

Blood specimens were collected fortnightly from each rabbit from ear vein puncture with sterilized needles into the vacuum tubes with and without ethyl diamine tetra acetic acid (EDTA). Non coagulated blood samples were processed for determination of haematological parameters using automated haematological analyzer following standard methods (Ghaffar et al., 2014). Serum was separated from coagulated blood samples and processed for detection of inorganic phosphorous and calcium using spectrophotometer (Mahmood et al., 2013).

Statistical analysis

Repeated measurement analysis of variance at 5% significance was applied using SPSS 17 software.

Results and Discussion

Hematological alteration

Significant (p < 0.05) decrease was recorded in, hematocrit, hemoglobin concentration and mean corpuscular volume. Total leukocyte count, monocytes, lymphocytes and red cell distribution width exhibited significant (p < 0.05) increase. Non-significant (p > 0.05) alteration was recorded for granulocytes. The detailed results are presented in Table 1.

Biochemical changes

Biochemical analysis revealed significant (p< 0.05) decrease in serum inorganic phosphorous and non-significant (p > 0.05) alteration in calcium concentration of serum. Results are presented in Table 1.

Significant decrease (P < 0.05) in red cell parameters i.e. total red cell count, hematocrit and hemoglobin as a result of gossypol treatment is indication of anemia which may be due to ability of gossypol to bind with iron thereby decrease of its availability for the erythropoiesis. The findings are complementary to (Lang et al., 2016) and contrasting (Prasad et al., 2009) with previous reports. Non-significant (p > 0.05) alteration recorded in red cell count, mean corpuscular hemoglobin concentration and mean corpuscular volume recorded in buffalo calves after gossypol treatment in a previous investigation may be associated with gossypol neutralization by microbial proteins in the rumen (Prasad et al., 2009).

Significant (p < 0.05) increases in red cell distribution width (RDW) with significantly decreased mean corpuscular volume (MCV) as a result of gossypol treatment is an indication of anisocytosis and microcytosis which is probably due to capacity of gossypol to bind with iron. Poikilocytosis and anisocytosis have also previously been reported after gossypol treatment (Câmara et al., 2016).

Significant (p < 0.05) increase in leukogram parameters i.e. total white cell count, lymphocyte count and monocyte is may be due to lipid antigen like action of gossypol because of being a terpenoid aldehyde. Antigen specific naive lymphocytes are present in very small number. Repeated stimulation initiates the proliferation of activated CD4+ helper T-lymphocytes thereby differentiating them into the effecter cells function of those is mediated by the action of different cytokines. Early response initiates the secretion of interleukin-2 (IL-2) by the CD4+ helper T-cells consequently stimulating the colonal proliferation of lymphocytes (Abbas et al., 2014). The findings are contrary to a previous report (Akingbemi et al., 1994) in which leucopenia had been explored in rats after gossypol treatment but these rats were malnourished. The report concluded that gossypol treatment can cause immune-suppression when combined with protein malnutrition. The report, however, also suggested the investigation for clarification because immunoglobulin level of the gossypol treated rats was favorably comparable in the control group.

Serum inorganic phosphorous level decreased significantly (p < 0.05) whereas serum calcium level remained non-significant (p < 0.05). In a previous investigation, significantly decreased coefficient of total tract apparent digestibility for phosphorous was recorded in a rainbow trout as a result of increased cotton seed meal supplementation (Lee et al., 2006). Significantly (p < 0.01) elevated magnesium and calcium whereas decline potassium concentration had been recorded in gossypol treated malnourished rats. The phosphorous level exhibited non-significant (p > 0.05) change (Akingbemi et al., 1994).

Conclusions and Recommendations

Gossypol ingestion induced microcytosis, anaemia and hypophosphataemia in rabbits.

Acknowledments

Principle author acknowledges the Higher Education Commission of Pakistan for funding of this research project.

Novelty Statement

Haematobiochemical aspects of gossypol toxicity by experimental ingestion of cotton seed cake to adult female rabbits, have not previously been explored, according to our knowledge.

Author’s Contribution

Altaf Mahmood: Designed experiment, conducted research and drafted the manuscript.

Muhammad Athar Khan: Supervised the research work.

Tanveer Hussain: Edited the manuscript.

Saima Parveen and Ayesha Azad: Analyzed the data and arranged references.

Conflict of interest

The authors declared that there is no conflict of interest.

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