NAAS Score – 4.31

Free counters!


Previous Next

Serum Biochemical Components in NARI Suwarna Ewes at Different Stages of Pregnancy

Shwetha H. S. Narayana Swamy M. Ranganath L. Srinivas R. B. Kalmath G. P. Veena M. P.
Vol 8(7), 232-237

The present study was designed to assess the serum biochemical parameters in NARI Suwarna ewes at different stages of pregnancy and diestrus. Non-pregnant ewes (n=7) at diestrus stage served as control group (Group I). The second, third, fourth and fifth month pregnant animals served as Group II, III, IV and V, respectively. Total serum protein, albumin and minerals such as calcium, phosphorus, potassium, sodium and chloride were determined from serum samples using commercially available reagent kits. The total protein, albumin, calcium and phosphorus levels in Group IV and V were significantly (P<0.05) lower compared to control group. However, serum sodium, potassium and chloride concentrations did not differ significantly between various groups. It was concluded that the reduced levels of total serum protein, albumin and certain minerals during late gestation periods could be due to haemodilution by blood volume expansion during pregnancy and increased demand of nutrients for the growing fetus.

Keywords : Calcium and Phosphorus NARI Suwarna Ewes Pregnancy Protein

Sheep husbandry plays a vital role in meat and wool production and it continues to be a backyard profession, primarily in the hands of poor, landless or small and marginal farmers. To enhance the fertility rate in local breeds of Maharashtra and to improve the economic status of farmers, Nimbkar Agricultural Research Institute (NARI) Phaltan District, Maharashtra, India, had evolved NARI Suwarna breed with increased production rate and litter size by crossing the Deccani (90%) with highly prolific breed Garole (10%) or with crossing of Deccani (60%), Madgyal (30%) and Garole (10%) (Anon, 2005). There will be changes in body metabolic rate in ewes during various physiological stages such as non-pregnancy, early pregnancy, mid pregnancy and late pregnancy. Blood biochemical parameters like total protein and albumin are important indicators of the metabolic activity in ewes (Karapehlivan et al., 2007). Mineral components play essential role in cellular metabolism, homeostasis, reproduction and growth as per the stages of life. Pregnancy represents the high anabolic period in the life cycle of female animal.
During pregnancy, protein and minerals acts as important nutrient substances for the dam and growing fetus. Mineral imbalance can affect pregnancy outcome through alterations in the metabolism of maternal and conceptus sides and the evaluation of protein and mineral profile during different stages of pregnancy would help in better management practice, nutritional practice and diagnosis of health condition.

Materials and Methods

The present study was conducted in NARI Suwarna ewes maintained at the Department of Gynaecology and Obstetrics, Veterinary College, Bengaluru under Rashtriya Krishi Vikas Yojana (RKVY). All the animals were maintained under semi-intensive rearing system. Seven healthy non pregnant ewes were selected and subjected to estrus synchronization by using intra-vaginal progesterone sponge for 11 days. After removal of sponge, pregnant mare serum gonadotropin 150 IU per animal and 75 microgram of cloprostenol per animal was given by intramuscular route. The seven ewes which were not mated or not artificially inseminated were allowed to enter the diestrus stage of estrous cycle to serve as Group I (Control group). Seven naturally mated animals were selected and second month of pregnancy was confirmed by using trans-rectal and trans-abdominal ultrasonography based on foetal head diameter, anechoic embryonic vesicle, fetal heart beat, gestational sac diameter and placentomes. The pregnant ewes were subjected to a longitudinal study which were designated as Group II (second month of pregnancy at 45-48 days), Group III (third month of pregnancy at 75-78 days), Group IV (fourth month of pregnancy at 105-108 days) and Group V (fifth month of pregnancy at 135-138 days) as the pregnancy advanced for these seven pregnant ewes. It is also designated as second month of pregnancy as early pregnancy, third as mid pregnancy, fourth and fifth as late pregnant animals.

Approximately 10 ml of blood samples were collected from seven non pregnant ewes at once and from pregnant animals at monthly intervals during morning hours between 9:30 and 10:30 AM before they were allowed for grazing. As per Institutional Animal Ethical Guidelines blood samples were collected vide No. VPY/334/2015-16 dt. 15.03.2016. Blood samples were allowed to clot for 45 minutes at room temperature and serum was separated by centrifugation at 3000 rpm for 20 minutes. Separated serum samples were stored at -20 ºC until analysis. The serum total protein, albumin, calcium, phosphorus, sodium, potassium and chloride levels were analysed by using assay reagent kits manufactured by Erba diagnostics, Mannheim, Germany. All these parameters were estimated by using Auto Analyzer (Model: Star 20 Analyzer) supplied by Rapid Diagnostic Pvt. Ltd. Delhi. The data was subjected to statistical analysis by using GraphPad Prism version 5.01 (2007), a computerized statistical software. One-way ANOVA with Tukey’s post test was employed to know the differences between various groups. The values were expressed as Mean ± Standard Error and the level of significance or non-significance was determined at P value of 0.05.

Results and Discussion

The serum total protein and albumin levels in Group IV and V were significantly (P<0.05) lower compared to non pregnant ewes (Table 1).

Table 1: The mean ± SE values of biochemical parameters in NARI Suwarna ewes at different stages of pregnancy and diestrus (n=7)

Parameter Group I Group II Group III Group IV Group V
Total protein (g/dL) 7.30 ± 0.26a 6.68 ± 0.17ac 7.21 ± 0.12a 6.34 ± 0.16bc 6.48 ± 0.14bc
Albumin (g/dL) 4.07 ± 0.54a 3.67 ± 0.05b 3.52 ± 0.06bc 3.37 ± 0.06c 3.18 ± 0.02d
Calcium (mg/dL) 9.86 ± 0.21a 9.09 ± 0.24ac 8.75 ± 0.24bc 8.48 ± 0.15bc 7.80 ± 0.35b
Phosphorus (mg/dL) 4.27 ± 0.30a 4.07 ± 0.22a 3.92 ± 0.24ac 2.92 ± 0.32bc 2.53 ± 0.29b
Sodium (mEq/L) 139.20 ± 0.92a 138.90 ± 0.91a 139.30 ± 0.83a 138.40 ± 0.82a 139.60 ± 0.74a
Potassium (mmol/L) 5.26 ± 0.21a 5.68 ± 0.20a 6.04 ± 0.32a 6.07 ± 0.17a 5.71 ± 0.23a
Chloride (mmol/L) 102.50 ± 1.36a 103.90 ± 0.43a 104.70 ± 0.49a 105.20 ± 1.30a 104.90 ± 0.48a

The values with different superscripts within a row differ significantly (P<0.05)

The present findings were in conformity with (Obese et al., 1994; Batavani et al., 2006 and Farghaly et al., 2011) who reported significant reduction in plasma total protein and albumin levels with advancement of pregnancy. The serum total protein level was lower in pregnant ewes compared to non-pregnant Bikaneri ewes (Purohit et al., 1999 and Soliman, 2014). The values recorded in the present study were comparable to the normal range (6.0 to 7.9 g/dL) reported for ewes by Kaneko et al. (2008). Iriadam (2007) and Antunovic et al. (2011) reported decreased total protein levels during late gestation and attributed the finding to increased utilisation of maternal proteins for fetal development in goats and sheep, respectively. However, serum total protein levels were significantly increased in late pregnant ewes compared to non-pregnant and early pregnant ewes as reported by Piccione et al. (2009) Khatun et al. (2011) and McDonald (1980). In the present study, the decrease in the serum protein and albumin levels during late stages of gestation might be due to haemodilution owing to increase in blood volume during pregnancy and increase in nutrient demand by the foetus. Twins and triplets in NARI Suwarna ewes could have profound effect on maternal serum total protein owing to increased demand by multiple fetuses.

The significantly (P<0.05) reduced levels of calcium and phosphorus in late pregnant ewes compared to early pregnant and non pregnant ewes were in agreement with the observations of Yildiz et al. (2005) in Akkaraman ewes, Pandya et al. (2012) in sheep and goats, El-Tarabany (2012) in sheep, Inayat et al. (2013) in Corriedale ewes and Dar et al. (2014) in goats. The reduction in serum calcium levels during late pregnancy was attributed to the increased demand for the mineralization of fetal skeleton as concluded by Bamerny (2013). The reduced levels of calcium during late gestation in NARI Suwarna ewes observed in the present study could be due to increased calcium demand by the growing fetus. It could also be due to reduced absorption of the calcium from the intestine owing to reduced serum proteins levels during late gestation observed in the present study. This decline in the calcium could also be due to reduced maternal ability to mobilize the calcium from the bone in ewes carrying more than one lamb. This effect could be more pronounced in NARI Suwarna ewes as they are known to carry twins and triplets. There was a significant reduction in the serum calcium levels during late gestation and proportionately to serum phosphorus levels also decreased to maintain normal Ca: P ratio.

The non-significant (P>0.05) differences were noticed for serum sodium and potassium levels at various stages of pregnancy and diestrus. The results are in accordance with Akhtar et al. (2010), AL-Hadithya et al. (2012) Michalek (2010) and Waziri et al. (2010). However, Elnageeb and Adelatif (2010) in Awasi ewes, Hafid et al. (2013) in desert goats, Deghnouche et al. (2013) in Ouled Djellal sheep reported increased sodium and potassium levels in pregnant ewes and goats. The non-significant (P>0.05) differences were noticed for serum chloride levels in the  present study were similar to the findings of Yokus and Cakir (2006), AL-Hadithya et al. (2012) and Akhtar et al. (2010) in cattle, Iraqi Awassi ewes and Buchi ewes, respectively. However, Yildiz et al. (2005) described that the serum chloride level was significantly increased from 100 days of gestation in sheep. The serum sodium, potassium and chloride concentrations recorded were within the normal reference range for sheep (Radostits et al., 2007; Kaneko, 2008; Ranjith and Pandey, 2014). The normal reference levels recorded in the present study could indicate the efficiency of the internal homeostatic mechanism to maintain minimum changes in the serum sodium, potassium and chloride levels inspite of different physiological stages. As serum electrolytes are highly regulated components there is meagre chance of variations in these components during different physiological stages. Therefore, the non-significant variation in serum sodium, potassium and chloride levels in different groups indicated that the physiological status of the animal do not influence their levels in the body.


In conclusion, based on the findings of the present study, it is recommended that during last month of pregnancy the concentrate feed comprising of protein and mineral mixture should be provided to NARI Suwarna ewes to overcome deficiencies if any.



  1. Akhtar MS, Farooq AA, Muhammad SA, Lodhi LA, Hayat CS and Aziz MM. 2010. Serum electrolyte and mineral variations during pregnancy and lactation in Nili-Ravi buffalo. Biological Trace ElementResearch. 3: 340-343.
  2. Al-Hadithy HAH, Al-Badawi NM and Bmahmood MM. 2012. Status of some serum electrolytes concentrations in Iraqi Awassi sheep. International Journal of Advanced Biotechnology and Research. 3: 540-544.
  3. Anonymus, 2005. NARI Annual Report, 2008-2009.
  4. Antunovic Z, Novoselec J, Sauerwein H, Speranda M, Vegara M and Pavic V. 2011. Blood metabolic profile and some of hormones concentration in ewes during different physiological status. Bulgarian Journalof Agricultural Science. 5: 687-695.
  5. Bamerny AO. 2013. Changes in some haemato-biochemical and electrolytes parameters in female Meriz goats during pregnancy and after parturition. Annals of Animal Science. 1: 11-14.
  6. Batavani RA, Ansari MH and Asri S. 2006. Concentrations of serum total protein and protein fractions during diestrus and pregnancy in Makuii ewes. Comparative Clinical Pathology. 4: 227-230.
  7. Dar AA, Jadhav RK, Rather FA, Bashir S, Dimri U, Khan AA, Wani SA and Sharma MC. 2014. Evaluation of plasma minerals vis-a-vis physiological status and seasonal variation in goats of Shuhama Alusteng area of Kashmir valley. African Journalof Agricultural Research. 9(13): 1070-1077.
  8. Deghnouche K, Tlidjane M, Meziane T and Touabti A. 2013. Influence of physiological stage and parity on energy, nitrogen and mineral metabolism parameters in the Ouled Djellal sheep in the Algerian Southeast arid area. African Journalof Agricultural Research. 18: 1920-1924.
  9. Elnageeb ME and Adelatif AM. 2010. The mineral profile in desert ewes (Ovis aries): Effect of pregnancy, lactation and dietary supplementation. Journalof Agricultural and Environmental Science. 1: 18-30.
  10. El-Tarabany AA. 2012. Physiological changes in ewes conceived single or twin foetuses related with survivability of lambs. Arab Journal of Nuclear Sciences. and Applications. 3: 223-235.
  11. Farghaly HAM, El-Sayed AI and Nada TM. 2011.Effect of some physiological parameters in female local sheep on some blood biochemical components and hormonal levels during pregnancy and lactation. Journal of Radiation Research and Applied Sciences. 4: 1219-1244.
  12. Hafid N, Meziane TM, Aamache B and Belkhiri M. 2013. Biochemical and Mineral Profile of South Eastern Algerian Desert Goats (Capra hircus). Iranian Journalof Applied Animal Science. 3: 527-531.
  13. Inayat S, Khan MZ, Lone FA, Malik AA and Inayath S. 2013. Impact of parity and gestation on blood mineral profile in Corriedale ewes. Wayamba Journal of Animal Science. 578: 736-742.
  14. Iriadam M. 2007. Variation in certain haematological and biochemical parameters during the peri-partum period in Kilis does. Small Ruminant Research. 73: 54-57.
  15. Kaneko JJ. 2008. In: Clinical Biochemistry of Domestic Animals (Eds. JJ Kaneko, JW Harvey and ML Brus) Proceeding of Academic Press, USA. pp 882.
  16. Karapehlivan M, Atakisi E, Atakisi O, Yucart R and PancarcI SM. 2007. Blood biochemical parameters during the lactation and dry period in Tuj ewes. Small Ruminant Research. 73: 267-271.
  17. Khatun A, Wani GM, Bhat JIA, Choudhury AR and Khan MZ. 2011. Biochemical Indices in Sheep during Different Stages of Pregnancy. Asian Journalof Animal and Veterinary Advances. 6: 175-181.
  18. Mcdonald, LE. 1980.Patterns of Reproduction. In: Veterinary Endocrinology and Reproduction. (Eds. MP Dooley and MH Pineda) Philadelphia. pp. 377-396.
  19. Michalek K, Jankowiak OM and Skrzypczak WF. 2010. Renal regulation of sodium, potassium and chloride balance in single and twin-pregnant goats. Acta Veterinaria Hungarica. 2: 199-209.
  20. Muthukumar G, Das PK and Rajandra ND. 2004. Influence of anestrus and estrus condition on haematological and biochemical constituents in Holstein-Friesian crossbred heifers. Indian Veterinary Medical Journal. 28:309–312.
  21. Nath HC, Baruah KK and Baruah A. 2005. Serum cholesterol and protein in pre, peri and postpartum cows. Indian Veterinary Journal. 82:519–521.
  22. Obese EY, Tuah AK, Okai DB, Osei SA, Adomako D, Frempong EB and Said AN. 1994. Effect of diet and stages of pregnancy on blood chemistry and haematology of Djallonke sheep fed diets containing various levels of cocoa pod husk. Journalof Biochemistry and Molecular Biology. 2: 44-51.
  23. Pandya U, Kumar D and Arya JS. 2012. Plasma mineral profile during gestation and post-partum in sheep and goats. Indian Veterinary 11: 106-108.
  24. Piccione G, Caola G, Giannetto C, Grasso F, Runzo SC, Zumbo A and Pennisi P. 2009. Selected biochemical serum parameters in ewes during pregnancy, post-parturition, lactation and dry period. Animal Science Papers and Reports. 4: 321-330.
  25. Purohit GN, Singh VK, Bishnoi BL, Kohli IS and Gupta AK. 1999. Biochemical Variations in Blood Profile of Pregnant Bikaneri Sheep. Indian Journal of Animal Nutrition. 2: 128-130.
  26. Radostits OM, Henderson JA, Blood DC, Arundel JT and Gay CC. 2007. Veterinary Medicine: A Textbook of the Diseases of Cattle, Sheep, Pigs, Goats, and Horses. Bailliere, Tindall Comp. UK.
  27. Ranjith D and Pandey JK. 2014. Mineral Profiles in Blood and Milk of Sheep. International Journal of Science and Research. 10: 821-826.
  28. Soliman EB. 2014. Effect of Physiological status on some haematological and biochemical parameters of Ossimi sheep. Egyptian Journal of Sheep and Goat Science. 9(2): 33-42.
  29. Waziri MA, Ribadu AY and Sivachelvan N. 2010. Changes in the serum proteins, hematological and some serum biochemical profiles in the gestation period in the Sahel goats. Veterinarski Arhiv. 2: 215-224.
  30. Yildiz A, Balikci E and Gurdogan F. 2005. Serum mineral levels at pregnancy and postpartum in single and twin pregnant sheep. Biological Trace ElementResearch. 3: 247-254.
Full Text Read : 2741 Downloads : 451
Previous Next

Open Access Policy