SQU Journal for Science, 2016, 21(2), 82-88 © 2016 Sultan Qaboos University 82 Effects of Age, Breed and Sex on Haematological Parameters of Growing Omani Goat Breeds Nur El Huda I. Osman*, Rashid M. Al-Busaidi and Eugene H. Johnson Department of Animal and Veterinary Sciences, College of Agriculture, Sultan Qaboos University, P.O. Box: 33, Al Khoud, PC 123, Muscat, Sultanate of Oman. *Email: hudaisam@gmail.com. ABSTRACT: Sixty seven healthy growing goat kids of three Omani breeds, born and raised in Sultan Qaboos University Agricultural Experiment Station, were used to study the effects of age, breed and sex on haematological parameters. Blood samples were collected at several times from the first to 25 weeks to study the following parameters: Red Blood Cells (RBCs), White Blood Cells (WBCs), Packed Cell Volume (PCV), Haemoglobin (Hb), Mean Cell Volume (MCV), Mean Cell Haemoglobin Concentration (MCHC) and Mean Cell Haemoglobin (MCH). At birth, MCV and MCH levels were significantly higher in Batina (BAT) kids than both Jabal Akhdar (JA) and Dhofari (DOF), but there were no breed differences in the rest of the haematological values. There were significant breed differences in RBC, MCH, WBC, MCV at different ages, with Hb and PCV being highly significant at all ages. All blood parameters changed with time but showed different patterns in all breeds. There was no effect of sex on RBC, MCHC, PCV, Hb or WBC, but female kids had significantly higher MCH and MCV values at week 12. This study indicates that haematology parameters in Omani goat kids could be affected by age, breed and sex. Keywords: Batina; Breeds; Dhofari Goats; Haematology; Jabal Akhdar; Oman. الدم في سالالت الماعز العمانية الناميةتأثيرات العمر والساللة والجنس على مكونات جونسون .ھالبوسعيدي ويوجين .عثمان، راشد منور الهدى عصام الدين من مواليد ماعز ثالثة سالالت عمانية بصحة جيدة، ولدت وتربت في محطة التجارب الزراعية لجامعة السلطان قابوس، 67تم استخدام عدد :ستخلصم بعد الميالد 25والساللة والجنس في قياسات مكونات الدم. تم تجميع عينات من الدم عدة مرات من االسبوع األول حتى االسبوع لدراسة تأثيرات العمر (، تركيز PCV(، قياس نسبة الهيماتوكريت )WBC(، عدد كريات الدم البيضاء )RBCقياسات المكونات اآلتية : عدد كريات الدم الحمراء ) لدراسة (، ومتوسط هيموجلوبين MCHC(، متوسط تركيز الهيموجلوبين في كرية الدم الحمراء )MCV(، متوسط حجم كرية الدم الحمراء )Hb) الهيموجلوبين ( أعلى بداللة إحصائية في مواليد ماعز ساللة الباطنة عن ساللتي الجبل MCH) ( وMCV(. في األسبوع األول كان قياس )MCHكريات الدم الحمراء ) ي فارية، ولكن لم يكن هناك فرق بينهم في قياسات بقية المكونات. كانت هناك فروقات ذات دالالت احصائية بين السالالت في أعمار مختلفة فاألخضر والظ ( في كل PCV( و )Hb(، مع فروقات ساللة ذات داللة احصائية عالية جداً في قياسات )MCV( و )WBC(، و )RBC( ،)MCHكل من قياسات ) (، RBC( ،)MCHCياسات كل المكونات تغيرت مع العمر بأساليب مختلفة في كل السالالت. لم يكن هناك تأثير للجنس على قياسات )األعمار. ق (PCV( ،)Hb) ( أوWBC( ولكن قياسات كل من ،)MCH( و )MCV في اإلناث كانت اعلى من الذكور بدرجة إحصائية عالية في األسبوع )هذه .12 ى أن قياسات مكونات الدم في سالالت الماعز العمانية النامية قد تتأثر بالعمر والساللة والجنس.الدراسة اشارت إل .الباطنة ، السالالت ، ظفاري ، ماعز ، مكونات الدم ، الجيل األخضر ، عمان: كلمات مفتاحية 1. Introduction here are over two million heads of livestock in Oman including 1.56 m goats [1], with three major breeds of goats, Jabal Akhdar (JA), Batina (BAT) and Dhofari (DOF). The JA breed is the largest in size among all goat breeds and mostly located in the interior of Oman especially Al Jabal Al-Akhdar Mountains (green mountains). They have back twisted-horns, long pendulous ears, long hair and are predominantly golden to brown in colour [2]. Batina breed goats have long hair, pendulous ears and a larger mature body size than the DOF goat, which resembles the short haired, prick-eared East African goat. The adult BAT goat, found mostly in the Batina coastal plain of North Oman, Batina may weigh 10–15 kg more than the DOF goat. The home of DOF goats is in the mountains of South Oman, Dhofar [3]. Local breeds have shown good potential for production when subjected to improved management [2]. Goats are mainly kept for meat in Oman. Their meat is preferred by Omanis to that of imported breeds. Local goats are sold for very high prices, and slaughtered at different social occasions. Haematological values are important parameters for the health status assessment of individual animals. Normal values can be altered by an animal’s exposure to abnormal conditions including environmental hazards, e.g. crude oil pollution [4], season [5], bacterial T mailto:hudaisam@gmail.com EFFECTS OF AGE, BREED AND SEX ON HAEMATOLOGICAL PARAMETERS 83 infections such as mastitis [6], Mycoplasma [7] or parasitic infestation [8]. They can also vary due to physiological status, breed and sex, or with age [9-11]. To our knowledge there is no detailed published record on the normal haematological values in Omani goat breeds. This is necessary for health assessment of goats by veterinarians in Oman. Therefore, the current study was conducted to provide reference values for haematology in healthy growing Omani goats, as well as to study the effects of age, breed and sex on these values. 2. Materials and Methods In this study, a total of sixty seven apparently healthy kids were used, 19 of JA, 19 of BAT and 29 of DOF goat breeds, which had been raised in Sultan Qaboos University Agricultural Experiment Station (AES). The animals were kept in clean partially shaded open yards equipped with feed and water troughs. Kids were weaned at age 12–14 weeks and were provided with either a general ruminant concentrate, prepared in the AES feed mill, or a commercial concentrate (Dairy 18; Oman Flour Mill Co., Oman) at a rate of 250-300 g/head/day. They were fed regularly at 9:00 am. Rhodes grass hay, either produced at AES or purchased through a local dealer, was offered ad libitum. The protein and some of the mineral concentrations in the various feeds are presented in Table 1. The animals were allowed free access to salt licks (Writex copper block, Frank Wright Feeds International LTD, Ashbourne, UK, Table 1) and water. All animals were routinely subjected to anthelmintics and they were internal and external parasite free. Table 1. Protein and mineral contents of feeds and salt licks offered to growing kids of Jabal Akhdar, Batina and Dhofari Omani goat breeds. Feed Trace elements (mg/kg DM) Protein (%) Copper Zinc Iron General ruminant concentrate 19.7 67.2 422 13.05 Dairy 18 27.0 79.3 524 16.96 Purchased hay 5.7 7.5 48 4.94 Farm hay 4.5 9.5 58 9.62 Salt lick (mg/kg) 400 2500 120 Blood samples were collected at 8:00 am from the jugular vein in vacutainer tubes containing the anticoagulant EDTA for haematology determination. Blood samples were collected at 1, 3, 8, 12, 16, 19 and 25 weeks. Haematological parameters were obtained in fresh samples using a Cell-Dyn 3700 automated blood analyzer (Abbott Laboratory, Diagnostic Division, Abbott Park, IL 60064, USA). The following parameters were analyzed: red blood cells (RBC), white blood cells (WBC), packed cell volume (PCV), haemoglobin concentration (Hb), mean cell volume (MCV), mean cell haemoglobin concentration (MCHC) and mean cell haemoglobin (MCH). 2.1 Statistical analysis General linear model statistical analysis was used to study the effects of age, breed and sex. The Type III method for sum of squares was used with the unbalanced model factorial design. The Duncan Multiple Range Test was used to compare the means. All analyses were carried out using SPSS 19 for Windows personal computer package [13]. 3. Results The means and ranges of haematological parameters in growing kids of the three Omani goat breeds are shown in Table 2. All haematological parameters changed during the experimental period. However, the trends in these changes were not similar across all the parameters. While WBC, RBC and MCHC gradually increased, MCV and MCH levels decreased from the first to the twelfth week (weaning age), then stabilised. However, haemoglobin was low at the first week, then increased at age 8 weeks. On the other hand, PCV dropped slightly from birth values in the second sampling at age 3 weeks, then returned to previous values and stabilised until the end of the experimental period. Table 2. Mean (± SE) and range of haematological values in kids of three Omani goat breeds at various ages. Age (weeks) RBC (1012/l) Hb (g%) PCV (%) MCV (fl) MCH (pg) MCHC (gm%) WBC (103/µl) Birth 8.2 ± 0.33 (7.6-8.9) 9.0 ± 0.16 (8.7-9.3) 28.3 ± 0.66 (26.9-29.4) 37.2 ± 1.48 (34.3-39.9) 11.9 ± 0.46 (11.0-12.8) 32.2± 0.33 (31.5-32.8) 9.93 ± 0.39 (9.16-10.7) NUR EL HUDA ET AL 84 3 11.6 ± 0.36 (10.9-12.3) 8.9 ± 0.14 (8.6-9.1) 26.6 ± 0.41 (25.8-24.4) 24.7 ± 1.0 (22.7-26.7) 8.3 ± 0.35 (7.6-9.0) 33.4 ± 0.21 (33.0-33.8) 13.24 ± 0.44 (12.36-14.12) 8 19.6 ± 0.49 (18.7-20.6) 10.4 ± 0.13 (10.1-10.6) 28.4 ± 0.33 (27.7-29.0) 15.1 ± 0.65 (13.8-16.4) 5.6± 0.22 (5.1-6.0) 36.5 ± 0.18 (36.1-36.8) 19.06 ± 0.54 (17.97-12.14) 12 23.2 ± 0.47 (22.3-23.2) 10.1 ± 0.18 (9.7-10.4) 27.3 ± 0.31 (26.7-27.9) 12.1 ± 0.27 (11.5-12.6) 4.5 ± 0.11 (4.2-4.7) 36.9 ± 0.53 (36.0-38.0) 23.51 ± 0.56 (22.39-24.64) 16 25.2 ± 0.87 (23.5-26.9) 10.4 ± 0.13 (10.1-10.6) 27.4 ± 0.36 (26.7-28.1) 11.4 ± 0.37 (10.7-12.2) 4.3 ± 0.13 (4.0-4.6) 37.8 ± 0.19 (37.4-38.2) 22.95 ± 0.68 (21.58-24.32) 19 19.5 ± 0.96 (17.6-21.4) 10.4 ± 0.13 (10.1-10.7) 27.9 ± 0.34 (27.2-28.5) 15.7 ± 0.58 (14.5-16.9) 5.9 ± 0.20 (4.5-6.4) 37.5 ± 0.33 (36.8-38.1) 24.42 ± 0.73 (22.96-25.87) 25 20.0 ± 0.73 (18.5-21.4) 9.1 ± 0.12 (8.9-9.3) 25.2 ± 0.37 (24.5-25.9) 13.6 ± 0.57 (12.5-14.8) 4.9 ± 0.21 (4.5-5.3) 37.7 ± 0.33 (36.0-37.3) 24.56 ± 0.70 (23.16-25.94) Table 2. Contd. There were significant breed differences in RBC, MCH, WBC, MCV, Hb and PCV, but there was no breed effect on MCHC (P>0.05). Means of RBC values in different breeds are presented in Table 3. Significant breed differences were observed at week 3 (P<0.05) with the highest values for JA, and week 8 (P<0.05) and week 12 (P<0.001) with the highest values for BAT. Despite these differences all breeds followed similar trends of change during the study period. Table 3. Means (± SE) of RBC (1012/l), Hb (g%), and PCV (%) haematological blood parameter values in growing kids of Jabal Akhdar, Batina and Dhofari Omani goat breads. (Means followed by the same letters, or with no letter, are not significantly different (P>0.05)). Breed Jabal Akhdar Batina Dhofari Breed effect Age Mean SE Mean SE Mean SE RBC (1012/l) Birth 8.6 0.59 7.3 0.60 8.7 0.49 NS 3 13.0a 0.64 11.2b 0.70 10.5b 0.51 P<0.05 8 21.3b 0.90 19.6a 0.93 18.0b 0.72 P<0.05 12 22.4b 0.88 26.1a 0.88 21.2b 0.66 P<0.001 16 26.4 1.67 25.6 1.62 23.7 1.18 NS 19 18.3 1.86 21.1 1.75 19.1 1.34 NS 25 19.4 1.42 21.7 1.33 18.8 1.00 NS Hb (g%) Birth 9.1 0.3 9.2a 0.3 8.6 0.24 NS 3 9.4a 0.25 9.3a 0.27 7.9b 0.2 P<0.001 8 10.7a 0.23 10.6a 0.24 9.9b 0.19 P<0.05 12 10.9a 0.33 10.1a 0.34 9.2b 0.25 P<0.001 16 11.2a 0.18 10.7a 0.67 9.3b 0.23 P<0.001 19 11.2a 0.25 10.9a 0.25 9.3b 0.19 P<0.001 25 9.6a 0.22 9.3a 0.22 8.5b 0.17 P<0.001 PCV (%) Birth 27.9 1.1 29.4 1.1 27.1 0.91 NS 3 27.8 a 0.73 27.9 a 0.8 24b 0.58 P<0.001 8 29a 0.6 29.1 a 0.6 27.1b 0.47 P<0.05 12 28.7a 0.56 28.7 a 0.6 24.6b 0.44 P<0.001 16 29.2a 0.66 28.4 a 0.7 24.6b 0.5 P<0.001 19 29.6a 0.63 28.8 a 0.6 25.2b 0.48 P<0.001 25 26.6a 0.68 26.2 a 0.7 22.8b 0.52 P<0.001 There were no significant (P>0.05) breed differences in either Hb or PCV (Table 3) at birth. Thereafter, DOF kids recorded consistently significant (P<0.001) but only at age 8 weeks, (P<0.05) lower values of Hb and PCV throughout the experimental period than both JA and BAT, which had similar values at all ages. There were significant breed differences for MCV (Table 4) at birth (P<0.05) due to the highest mean value in BAT, at week EFFECTS OF AGE, BREED AND SEX ON HAEMATOLOGICAL PARAMETERS 85 12 (P<0.05) where the JA mean value was higher than BAT, and week 19 (P<0.05), where the JA mean value was higher than both BAT and DOF. Table 4. Means (± SE) of MCV (fl) MCH (pg) and WBC haematological blood parameter values (103/µl) in growing kids of Jabal Akhdar, Batina and Dhofari Omani goat breads. (Means followed by the same letters, or with no letter, are not significantly different (P>0.05)) Breed Jabal Akhdar Batina Dhofari Breed effect Age Mean SE Mean SE Mean SE MCV (fl) Birth 34.4a 2.5 43.1b 2.6 33.9a 2.1 P<0.05 3 22.6 1.79 27.6 1.95 23.9 1.42 NS 8 14.2 1.19 15.7 1.22 15.5 0.95 NS 12 13.0a 0.49 11.2b 0.49 11.9ab 0.37 P<0.05 16 11.7 0.71 11.6 0.69 11.0 0.5 NS 19 18.4a 1.13 14.3b 1.06 11.4b 0.81 P<0.05 25 14.8 1.1 12.7 1 13.5 0.78 NS MCH (pg) Birth 11.3b 0.84 13.6a 0.84 10.8b 0.68 P<0.05 3 7.7 0.61 9.3 0.68 7.8 0.49 NS 8 5.2 0.4 5.7 0.41 5.8 0.33 NS 12 5.0a 0.21 4.0b 0.21 4.4ab 0.16 ** 16 4.5 0.26 4.4 0.25 4.1 0.18 NS 19 7.0a 0.34 5.4b 0.36 5.2b 0.27 P<0.001 25 5.3 0.4 4.5 0.4 5.0 0.28 NS WBC (103/µl) Birth 9476 712 10079 712 10229 576 NS 3.56 12905b 442 11131b 86b 15683a 629 P<0.001 8.27 18994b 542 17294b 1029b 20882a 801 P<0.05 12.44 24167 564 22505 1068 23870 804 NS 16.3 24046 684 21094 1305 23717 953 NS 20.3 24918b 729 21947 b 1359 26386 1041a P<0.05 25.15 25847 700 23669 1301 24167 950 NS At birth BAT kids had significantly higher values for MCH (P<0.05) than both JA and DOF (Table 4). After weaning, JA goats had the highest values but thereafter the only significant differences were at week 12, when JA MCH values were higher than those for BAT (P<0.01), and at week 19, when they were higher (P<0.001) than those for both BAT and DOF kids. Dhofari kids had higher WBC count pre-weaning, than both JA and BAT in week 3 (P<0.001) and week 8 (P<0.05) (Table 4). Post weaning, BAT consistently recorded the lowest values but these were significantly lower than DOF (0<0.05), which was the highest, only at week 20. There was no significant (P>0.05) effect of sex, or a clear tendency, on PCV, MCHC or WBC during the experimental period, nor was there any significant (P>0.05) effect of sex on RBC at any time. However, there was a tendency (P=0.053) of higher values in females (8.9±0.49) compared with males (7.7±0.49) at birth. Similarly, there was no significant (P>0.05) effect of sex on Hb at any time. However, there was a tendency (P=0.084) of higher values in females (10.2±0.26) compared to males (9.6±0.28) at 12 week. Male kids had a tendency (P=0.064) of higher MCV mean value at birth than females (38.5 ± 1.97 vs 35.9 ± 2.2, respectively). This tendency (P=0.062) in males continued in the next bleeding at age 3 weeks (26.3 ± 1.43 vs 22.7 ± 1.34, respectively). Thereafter, female kids’ values exceeded those of males but this was significant (P<0.05) only at age 12 weeks (12.8 ± 0.36 vs 11.4 ± 0.37, respectively). A similar trend was in observed in MCH, with a tendency (P=0.06) of higher values of MCH in male kids (12.6 ± 0.64) than in females (10.8 ± 0.65) at birth, and at 3 weeks (P=0.075) (8.8 ± 0.5 and 7.7 ± 0.47, respectively). Thereafter, female kids had higher values but the difference was significant (P<0.05) only at age 12 weeks (4.7 ± 0.16 and 4.2 ± 0.16, respectively). 4. Discussion The haematological blood parameters, such as RBCs, Hb, WBCs, can reflect physical changes occurring in an animal’s body. These changes could be due to diseases or normal physiological changes. Haemoglobin is the substance responsible for transporting oxygen to body tissues and removing waste carbon dioxide. It also plays an important role in maintaining the pH of the blood. RBCs transport Hb. Reduction of Hb or of RBCs results in low O2 in tissues, causing short breath, a symptom of anaemia. WBCs, or leukocytes, defend the body against invasions of foreign particles. Their number can be used to detect the presence of pathogens in the blood of sick animals. NUR EL HUDA ET AL 86 The change of values with age of all the haematological parameters in the growing kids in this study is in line with other reports that either compared groups of young and adult goats [13-14], goats of many age groups [15-21] and sheep [10,11,15] or studied changes in growing animals as in calves [22,23] and swine [24]. The drop in Hb and PCV values from birth to three weeks of age and the subsequent increase to previous values reported in this study is comparable to that in neonatal Dwarf and Landrace kids reported by Mbassa and Poulsen [17]. At early age the mean values of all parameters in Omani kids were comparable to those reported by Gutierrez, et al. [25] in 1 week old Canary goat kids. At about three months of age, however, only PCV values were comparable to that of white German and Coloured German Noble breeds [26]. Values of RBCs, Hb, MCH and MCHC were higher while MCV and WBC were lower in Omani kids than in German breeds. Comparing Omani kid’s values at the end of study period i.e. at age 25 weeks, with other goats, Hb was comparable to that of Barbari male goats at 9-12 months of age [28] lower than the mean value of adult West African Dwarf goats [13] and within the goat range provided by the Merck Veterinary Manual [29]. On the other hand RBCs, MCHC and WBCs were higher while PCV, MCV and MCH were lower in 25 weeks old Omani kids than the values reported by Sharma, et al., Daramola et al., and the Merck Veterinary Manual [13,27,28]. The differences between values obtained in the current study and other reports can be attributed to many factors including differences in climate [5], diet [29], management system [30-33] and breed. The latter cause is confirmed in the current study, as goats of all breeds were raised under the same conditions. Breed difference in haematological values was also established in other goats in Ethiopia [21], Bangladesh [20], in Northern Nigeria [34] and Mubi Adamawa State of Nigeria [35]. The DOF breed had the lowest values for both Hb and PCV and, mostly, the highest values of WBCs. That may indicate a lower health status of DOF goat. That suggestion is supported also by the lower Hb and PCV mean values in DOF than those reported elsewhere [13,25-27] and below the range of the Merck Veterinary Manual (2009)[25]. However, this difference could be due to difference in breed per se or to low acclimatization of DOF to the different habitat of the study area (Muscat) compared to Dhofar, the original habitat of this breed. No record is available on the haematological values of this breed in its natural habitat. However, this supports the statement of Daramola et al. [13] that it is difficult to establish a universal haematological profile. There was a significant sex difference only at age 12, the weaning age, where females had higher MCV and MCH, although there were tendencies of higher values for females than male at early age on RBC, and on Hb (at 12 week). There were higher MCVs in 0-3 m and 3-6 m old groups of female goats in Borno State of Nigeria [18]. In the latter report, sex also influenced RBC, Hb and PCV. This was in contrast to the report of Tibbo et al. [21] who found significantly higher PCV and RBC values in males than females in Ethiopian native goats but no significant sex effect on MCHC or WBC and reports of Egbe-nwiyi et al. [18] with higher RBCs, PCV and MCV values in male goats between birth and 7 years. Similarly, Ramprabhu et al. [19] reported that males had higher values of Hb, PCV, RBC and WBC in Kanni Indian goats. On the other hand, sex did not affect haematological parameters in neonatal Dwarf and Danish Landrace kids [17] and West African Dwarf goats [13,30]. 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