Pathological and Bacteriological Assessment of Reproductive Organ Disorders in She Camels in Somali, Eastern Ethiopia.

BACKGROUND: Reproduction is a vital necessity for effective livestock production, and its productivity depends on the normal structure and function of the genital organs.
METHODS: A study was carried out to characterize gross pathological lesions and identify aerobic bacteria from reproductive organ disorders of slaughtered she-camels (Camelus dromedarius) in the Fafen zone of the Somali Regional States of Ethiopia. All the available reproductive organ (50) samples were considered during sampling and cultured bacteriologically using a standard procedure.
RESULTS: Accordingly, eighteen out of fifty female dromedary camels (36%, 18/50) were found to have gross pathological lesions on the genitalia, including acute metritis (10%), pyometra (8%), cervicitis (6%), vaginitis (4%), follicular cysts (4%), inactive/hypoplastic ovaries (2%) and vaginal lymphocytic masses (2%). Based on the anatomical distribution of reproductive tract lesions, uterine abnormalities were the most frequently observed lesions (18%, 9/50), followed by cervicovaginal abnormalities (12%, 6/50) and ovarian abnormalities (6%, 3/50). In addition, eight different species of bacteria were identified from the sampled reproductive organs: 29 (58%) from the uterus, 7 (14%) from the cervix, 7 (14%) from the vagina, 4 (8%) from the udder, and 3 (6%) from the ovary. Of the total isolated bacteria, coagulase-negative Staphylococcus species 25 (50%), Staphylococcus aureus 18 (36%), E. coli 12 (24%), Streptococcus species 11 (22%), Salmonella species 6 (12%), Proteus species 8 (16%), Shigella species 2 (4%) and Klebsiella species 1 (2%) were the most commonly identified bacterial species.
CONCLUSION: The study revealed that gross lesions of reproductive tracts and their bacterial isolates are prevalent in female dromedary camels. The role of each reproductive tract lesion and bacterial isolate as causes of reproductive failure in camels requires further investigation.

Introduction

Globally, there are approximately 22 million camels, 89% of which are one-humped camels (Camelus dromedarius). East African countries such as Somalia, Sudan, Ethiopia, Kenya, Djibouti, and Eritrea are home countries to a proportionally greater number of one-humped camels than the rest of the world.1 In addition to Somalia and Sudan, Ethiopia is ranked third in Africa, with an estimated camel population of 2.4 million, and these camels are mainly located in lowland areas of the Beja, Rashaida, Somali, Afar, and Oromia Regional States.1,2 Despite its significant importance to the existence of pastoralist societies with limited alternative ways of production, the camel has been one of Ethiopia’s most overlooked domestic animals by the scientific community until recently.3,4

The dromedary camel is a multipurpose animal found mostly in the pastoral areas of Ethiopia’s southern, eastern, and northeast regions,4,5 and is the primary source of milk, meat, wool, hides, and skin in pastoral areas, such as Afar, Somali and Borana areas, especially during the dry season, where cattle milk is scarce.6–8 Camel is considered a desert ship due to its special adaptability in arid and semiarid pastoral areas of eastern Ethiopia, where water and feed are minimal.9–11

At present, camels have been one of Ethiopia’s export animals, even though their productivity faces multifaceted challenges due to infections causing several reproductive organ disorders leading to infertility or poor reproductive efficiency.12–16 In moving herds, calving rates of camels rarely reach 40%, whereas they reach 70% in more intensively controlled herds.16 To produce genetically superior animals, emphasis should be directed towards better veterinary care and production systems.17 Some investigations conducted on reproductive organs have identified several types of uterine disorders that may result in reduced fertility in camelids.18,19 The types and occurrence of reproductive disorders in she-camels are investigated in limited studies, particularly those that relate clinical manifestations with the actual causes of infertility.20 The real causes of camel infertility have been suggested to be uterine infections, ovulation failure, and poor husbandry practices.21

Uterine infections in female camels are mostly caused by postpartum problems and an unhygienic approach to reproductive organs during therapy.15 Severe uterine inflammation has been linked to aggressive mating during the wrong stage of follicular development.22,23 Other problems in management include breeding with a young male, repeated use of males, and a lack of intromission during copulation.24

Identifying the causative agents and assessing their susceptibility to various medications often helps practitioners select the most appropriate medication;25 in this regard, among problems that significantly impact camel reproductive health, various bacterial diseases of the camel reproductive system are known to take Lion’s share. Fayed and Refai26 reported acute catarrhal or suppurative endometritis, chronic endometritis, pyometra, and abscesses of the uterine wall as the main genital tract infections of camels. In addition, abortions in camels were caused by Salmonella spp., Proteus spp., E. coli, Staphylococcus aureus, Klebsiella spp., Staphylococcus spp., Streptococcus spp., Streptococcus pyogenes, Pasteurella multocida, Serratia spp., Pseudomonas spp., and Corynebacterium pyogenes, and all these were isolated from cases of endometritis associated with pyometra in she-camels slaughtered at Cairo abattoir.

A major cause of economic losses connected with infertility, culling, and slaughtering in several mammalian species, including dromedary camels,27–29, is various infectious diseases and pathological lesions in the female genital system.30,31 As a result, abattoirs are a suitable place to look for pathological lesions of the reproductive organs that can lead to infertility or even sterility. Furthermore, the majority of female reproductive organ problematic lesions have no extra outward signs. As a result, postmortem abattoir-based surveys are important to discover the majority of these reproductive anomalies.13,32 The investigation of gross and microscopic genital tract lesions thus plays a critical role in the detection of these issues.

Abattoir-based research on camel and cow reproductive organ abnormalities, such as lesions of the uterus, ovary, oviduct, cervix, and vagina, has previously been described in numerous regions of the world, including Ethiopia.33–35 Ovariobursal adhesion, follicular cyst, luteal cyst, paraovarian cyst, ovarian hypoplasia, vaginitis, cervicitis, hydrosalpinx, pyosalpinx, hydrometra, endometritis, cervical ring hypoplasia, and uterine hypoplasia were some of the pathological abnormalities seen in most prior research in Ethiopia28,29,36,37 and other camel-rating countries, such as Egypt,30 Saudi Arabia,38,39 Nigeria,40 Algeria,41,42 Iraq43 and Pakistan.44 Most previous studies revealed that uterine lesions were the most frequently encountered reproductive organ disorders in camels and cows.39,41,43,45–47 However, there is little published information about the reproductive problem of female dromedary camels in Ethiopia.28 Thus, this investigation aims to assess gross pathological lesions and isolate aerobic bacterial pathogens from reproductive organ disorders of she-camels in the Fafen zone of Somali Regional State, Eastern Ethiopia.

Materials and Methods

Study Area

The study was performed in the Fafen zone of the Ethiopian Somali Regional State (ESRS) from November 2017 to April 2018. Jigjiga town, the capital of ESRS, lies 628 kilometers east of Addis Ababa at 9°20ʹ north latitude and 42°47ʹ east longitude. The district’s elevation extends from 900 to 1600 meters above sea level, and the area receives 300–500 mm of annual rainfall, with typical annual temperatures of 20°C and 28°C, respectively.48 The samples are taken from the only Jigjiga municipal slaughterhouse, and a small number of slaughtered camels (3–6) are due to shortages of related facilities. Out of this, only a few females were slaughtered. It has not been possible to ascertain the motives for taking these camels for slaughter because of the nomadic nature of the camel owners in the study field.

Study Animals

The study animals were dromedary camels (Camelus dromedarius) of both sexes, with different age groups (ranging from 8 to 15 years old) coming mostly from Aweber, Godie, Bable, and Fafen pastoral areas.

Study Design and Sample Size Determination

An abattoir-based cross-sectional study was carried out to investigate gross pathological disorders and isolate bacterial pathogens from the reproductive organs of fifty slaughtered female camels. Nonprobability sampling methods were used, and the existence of any reproductive organ disorders was investigated postmortem from all slaughtered camels in the abattoir during each visit. We were unable to acquire information about infertility history since the merchants had no information about the previous history of the camels. However, general physical and clinical examinations were carried out before slaughter, paying attention to indications of the reproductive system, such as vulva for any gross lesion, signs of vaginal discharge, and diagnosis of pregnancy.

Sample Collection and Processing

All-female camels brought to the abattoir were appropriately examined for the presence of any abnormal signs during antemortem and postmortem. The abattoir visit was made three times per week, and during each abattoir visit, approximately 3–6 camels were slaughtered, and 1–2 of them were female camels. Immediately after slaughter, the entire reproductive organ (mass) was carefully and aseptically removed, excised using a sterile surgical blade, and inspected for the presence of gross pathological changes with close attention to the vagina, cervix, uterus, oviducts, and ovaries. To avoid cross-contamination between samplings, single-use sterile instruments (such as sterile blade and forceps) were used during the collection of each sample.

Gross lesion examination was conducted using criteria from Veterinary Medical Teaching Hospital, USA,49 in which visual inspection and palpation were used to determine lesion distribution, contour, consistency, texture, shape, scale, and color of the organs, as well as the extent and nature of the exudate contained upon incisions, were recorded in a format prepared for the purpose. Any gross lesions or anomalies found along the reproductive tract (uterus, ovaries, cervix, vagina, oviducts, and bursa) have been reported. The surface of the tissue with the lesion was decontaminated with a moderate hot flame, collected separately in a sterile universal bottle, tagged, and taken to Jigjiga University Microbiology Laboratory for bacteriological investigation. All procedures were conducted according to Quinn et al.50

Bacteriological Analysis

All bacteriological processes were conducted following the standards set by Quinn et al.50 The organs were chopped using sterile scissors and forceps, homogenized using a mechanical tissue homogenizer, put into brain heart infusion broth, and placed in a standard incubator for 24 hrs at 37°C. The bacteria were then streaked on 7% sheep blood agar and cultured aerobically for additional 24 hours at 37°C. The plates were then tested for growth and colony morphology, size, and form, as well as the presence or absence of hemolysis. Nutrient and MacConkey agars were used to subculture the colonies.

Catalase, oxidase, oxidation fermentation, motility tests, and Gram staining were used for primary identification. For the suspicious samples from the initial test findings, selective and differential media, such as mannitol salt agar, Edwards’ medium, eosin methylene blue (EMB), xylose lysine deoxycholate (XLD), and Salmonella Shigella agar, were utilized. After 24 hours of incubation, the selective medium showed typical growth. A colony was put into brain heart infusion for further biochemical studies. IMViC assays were performed, including the indole test, methyl red test, Voges-Proskauer (VP) test, and citrate test. Secondary biochemical testing included coagulase, aesculin hydrolysis, urease, lysine, and sugar assays, such as glucose, sucrose, lactose, maltose, xylose, trehalose, raffinose, and mannitol.50,51

Data Analysis

All databases on genital bacteria and their isolation rates were recorded on Microsoft Excel 2019 and analyzed using STATA version 13 for descriptive analysis. A descriptive statistic was used to determine the frequency of the isolates and pathological abnormalities of the reproductive organs.

Results

Characterization of Gross Lesions in Different Parts of Reproductive Organs

Out of the 50 female dromedary camels investigated for reproductive organ abnormalities, 36.0% (n = 18) had gross lesions. During sample collection, many forms of reproductive diseases or disorders were identified, including metritis, pyometra (uterine infection owing to the presence of pus), cervix, and vaginal problems.

Accordingly, uterine lesions with an 18.0% prevalence rate were found to be the most frequently detected abnormalities in the reproductive tracts of the examined camels. Among the uterine abnormalities, metritis and pyometra were found to be the most frequent uterine abnormalities. The second most frequent abnormalities of the examined reproductive tracts were cervical and vaginal disorders (12%), followed by ovarian abnormalities (6%) (Table 1).

Table 1

Summary of Type and Frequency Reproductive Organ Abnormalities of Examined She-Camels

Pathological Lesions	Frequency	Percentage (%)
Uterine Lesions
Acute metritis	5	10.0
Pyometra	4	8.0
Ovarian disorders
Follicular cyst	2	4.0
Inactive/hypoplastic ovary	1	2.0
Cervix and vaginal disorders
Cervicitis	3	6.0
Vaginitis	2	4.0
Vaginal lymphocytic mass	1	2.0
Total	18	36.0

Isolation Rate of Aerobic Bacteria from Reproductive Organ Disorders

In this study, all 50 (100%) sampled reproductive organs of she-camels were positive for at least one bacterium. Of this, 21 (42%) of the samples had only one bacterial isolate. On the other hand, approximately 29 (58%) of the samples had at least two different bacterial organisms. Organ-wise distribution revealed that 58% (29/50) of isolates were from the uterus, 14% (7/50) were from the cervix and vagina, 8% (4/50) were from the udder, and 6% (3/50) were from the ovary (Table 2).

Table 2

Distribution of Isolated Bacteria from Reproductive Organs of She-Camels

Organ	Frequency	Percent (%)
Cervix	7	14
Ovary	3	6
Udder	4	8
Uterus	29	58
Vagina	7	14
Total	50	100

Bacteria Isolated from Various Reproductive Organs

Overall, eight different types of bacterial isolates were identified from the reproductive organs of she-camels in the study area. The bacteria isolated were coagulase-negative Staphylococcus (CoNs) 25 (50%), S. aureus 18 (36%), E. coli 12 (24%), Streptococcus spp. 11 (22%), Salmonella spp. 6 (12%), Proteus spp. 8 (16%), Shigella spp. 2 (4%) and Klebsiella spp. 1(2%). The most prevalent isolated organism was CoNs 25 (50%), while the least prevalent was Klebsiella spp. 1(2%) (Table 3).

Table 3

Bacterial Species Isolated from Reproductive Organ Disorder of She-Camels

Isolated Bacterial Species	Total No. of Isolates	Proportion (%)
Coagulase-negative Staphylococcus spp.	25	50
Staphylococcus aureus	18	36
E. coli	12	24
Streptococcus spp.	11	22
Salmonella spp.	6	12
Proteus spp.	4	8
Shigella spp.	2	4
Klebsiella spp.	1	2

Organ-Wise Distribution of Isolated Bacteria from Different Reproductive Organs

The organ-wise distribution of isolated bacteria is presented in Table 4. Coagulase-negative Staphylococcus species (CoNs) were the highest bacterial isolates from the cervix, ovary, udder, uterus, and vagina, with proportions of 57.1%, 66.7%, 50%, 48%, and 42.9%, respectively, while the lowest proportion of bacterial isolates (Proteus, Shigella, and Klebsiella species) was isolated from the cervix (Table 4).

Table 4

Organ-Wise Distribution of Isolated Bacteria from Different Reproductive Organs

Organs		CoNs	S. aureus	Streptococcus spp.	Salmonella spp.	E. coli	Proteus spp.	Shigella spp.	Klebsiella spp.
Cervix	Counts (%)	4 (57.1)	3(42.9)	3 (42.9)	1 (14.3)	2 (28.6)	0 (0.0)	0 (0.0)	0 (0.0)
Ovary	Counts (%)	2 (66.7)	1 (33.3)	0 (0.0)	0 (0.0)	1 (33.3)	0 (0.0)	0 (0.0)	0 (0.0)
Udder	Counts (%)	2 (50.0)	2 (50.0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
Uterus	Counts (%)	14 (48.3)	9 (31.0)	7 (24.1)	4 (13.8)	0 (0.0)	6 (20.7)	2 (6.9)	4 (13.8)
Vagina	Counts (%)	3 (42.9)	3 (42.9)	1 (14.3)	1 (14.3)	2 (28.6)	2 (28.6)	0 (0.0)	1 (14.3)
Total	Counts (%)	25 (50.0)	18 (36.0)	11 (22.0)	6 (12.0)	12 (24.0)	8 (16.0)	0 (0.0)	5 (10.0)

Discussion

Camelids have been shown to have a variety of reproductive abnormalities, which may play a part in their low fertility.52 The current study revealed that camels suffer from different infectious diseases, and various types of gross pathological lesions were recorded. The detection of uterine infection is critical in preventing the spread of infection to other animals through venereal transmission. Furthermore, determining the causative agents and their susceptibility to various medications helps practitioners select the most effective treatment.25

Similar abattoir-based studies have been conducted in several parts of the globe on reproductive abnormalities of camels by Shawky et al30 in Egypt, Ali et al;38 Ali et al,39 in Saudi Arabia, Muhammad et al,40 in Nigeria, Simenew et al31 in Ethiopia, Benaissa et al;53 Benaissa et al,41 in Algeria, Wajid,43 in Iraq and Mustafa et al,47 in Pakistan. All these studies were based on gross lesions, and most microscopic and bacterial cultures were not conducted.

The characterization of gross lesions was carried out depending on distinct lesion characterization attributes. When there are active inflammation and redness (hyperemic) areas, the lesion is classified as acute. Suppurative exudates appeared in the form of pus (creamy yellow), with the afflicted tissue melted into a soft sticky substance. When the majority of the acute metritis lesions were palpated, they were soft.54

In the present study, organ-based gross lesions of the reproductive tract abnormality were also conducted. Of the total genital tracts examined, 36% (18/50) of organs had at least one gross pathological lesion of the reproductive systems. The organ-level pathological lesion of the genital tract was in line with the earlier reports of Getahun et al52 in central Ethiopia that reported 34.2% and lower than Belina et al54 who reported 64.6% pathological lesion in Eastern Ethiopia.

The prevalence of macroscopic genital abnormalities found in the current investigation was comparable with the result of Wajid,43 with a prevalence of 31.5% in Iraq. However, the reproductive organ abnormalities recorded in our study were higher than the report of Melaku et al,31 who recorded (19.9%) abnormalities, Benaissa et al,53 who reported (28.8%), and Shawky et al,30 who reported (26%) abnormalities from Ethiopia, Algeria, and Egypt, respectively. This difference might be due to differences in management, provision of veterinary intervention, geographic location, and type of diet.

Based on the anatomical classification in the present study, uterine abnormality 9 (18.0%), followed by cervicovaginal abnormality 6 (12.0%), and ovarian abnormality 3 (6.0%) were the most prevalent. The uterine abnormalities 9 (18.0%) found in this research were lower than Belina et al54 in Eastern Ethiopia and who reported 41.2%. It was comparable to Getahun et al52 in Addis Ababa, Adama, and Akaki abattoirs and Wajid43 in Iraq, who reported 21.4% and 20%, respectively. However, the finding of the ovarian lesion was 3 (6.0%), which was lower than Melaku et al31 14 (6.5%) in Ethiopia, Wajid,43 10 (12.5%), Hamouda et al46 61 (10.16%) in Saudi Arabia.

The incidence of acute metritis in this research was 5 (10.0%), and the current finding was comparable with the report of Melaku et al,31 13.4% in Ethiopia and Shawky et al30 13.2% in Egypt and Wajid,43 16 (20%) in Iraq. However, it was lower than Getahun et al,52 who reported 39.1% in central Ethiopia. The disparity might be due to differences in sample size, the study period, management systems and veterinary services, as well as nutritional and physiological variables between the camels in the various research areas. Repeated mating of male camels, postpartum problems, and unhygienic genital organ intervention might all contribute to dromedary camel uterine infection.15 Severe uterine infection can develop due to aggressive mating at the “wrong” period of follicular growth.23 As age increased, she-camels were more predisposed to metritis than younger camels, which is a report by Waheed et al.55 This might be because mature animals are more likely to have a repeated number of mating, delivery, and/or frequent postdelivery problems than other age groups.

The prevalence of follicular cysts and inactive/hypoplastic ovaries in dromedary camels was 4% and 2%, respectively. It was lower than Getahun et al52 in Addis Ababa, Adama, and Akaki (7.14%) and Belina et al54 in Eastern Ethiopia (35.3%). This might be related to the fact that dromedary camels are prone to developing follicular ovarian cysts in the absence of coitus.16,24 Furthermore, this can be linked to a variety of influencing variables, such as milk production, food, management, and activity, all of which may impact the occurrence of cystic follicles in any animal species.15,56 Although the specific origins of ovarian follicular cysts are unknown, it is known that they form when one or more follicles fail to ovulate and then refuse to retreat, allowing development and steroidogenesis to continue.57,58

On the other hand, these cysts are thought to be the result of persisting embryonic structures that are remnants of Wolffian ducts.46 The low prevalence of inactive ovaries in dromedary camels revealed in this study might be due to the camelids’ seasonal mating pattern and the fact that the current investigation was conducted, while most camels were cyclic. It was also proven that the dromedary camel’s peak sexual activity occurred between November and February.59 The size and weight of the ovaries, on the other hand, may be affected by the animal’s age, size, and stage of the reproductive cycle. In juvenile and adult camels, ovarian size is often larger during breeding seasons.60

The current research showed that all (100%) of she-camel reproductive organ samples were infected with at least one bacterium that included coagulase-negative Staphylococcus spp., Staphylococcus aureus, E. coli, Streptococcus spp., Salmonella spp., Proteus spp., Shigella spp., and Klebsiella spp., with isolation rates of 50%, 36%, 24%, 20%, 12%, 8%, 4%, and 2%, respectively. This rate of isolation is in contrast to the study in Egypt by Nabih and Osman,25 which found the in contrast to the presence of bacteria were detected in samples (87.5%) of endometritis (92.5%) of metritis cases. Uterine infections are the most frequent of these disorders, as they appear in so many domestic animal species.16,20,61–64 The uterus is exposed to infection risks throughout a she-camel’s reproductive life, especially during breeding and after parturition, when various microorganisms are carried into the uterine cavity from the posterior part of the genitalia or the environment, and partial or complete failure of these mechanisms allows the infection to take hold.15,54

The most prevalent cause of reproductive failure in Camelidae is uterine infections.65 In the uterus, we isolated CoNs (48%), S. aureus (31%), E. coli (24%), Streptococcus spp. (24%), Salmonella spp. (13.8%), Proteus spp. (20.7%), Shigella spp. (6.9%), Klebsiella spp. (13.8%). In the study by Nabih and Osman25 in Egypt, the prevalence of Proteus spp. (25%) is pretty higher than our study, whereas Klebsiella spp. (20%) and Salmonella spp. (17.5%) were comparable to our study. In another study by Yagoub,66 in Sudan, isolated a very high proportion (60%) of S. aureus. Other authors have isolated a range of bacterial species from cases of metritis, including Streptococcus zooepidemicus, hemolytic Streptococci, Enterococcus, coagulase-negative Staphylococcus, Proteus spp., Enterobacter aerogenes, Klebsiella pneumoniae, and Arcanobacterium pyogenes.20,64,67–70

The high rate of isolation of S. aureus in many of the aforementioned authors might indicate the wide distribution of this organism in the environment and consequently, cause many diseases. The outcome of the present study revealed that all sampled (100%) reproductive organs of she-camels were infected with at least one bacterium that comprised coagulase-negative Staphylococcus spp., Staphylococcus aureus, E. coli, Streptococcus spp., Salmonella spp., Proteus spp., Shigella spp., and Klebsiella spp., with isolation rates of 25 (50%), 18 (36%), 12 (24%), 10 (20%), 6 (12%), 4 (8%), 2 (4%) and 1 (2%), respectively. These are indicative of significant bacterial infectious agents of reproductive organs she-camels and important human pathogens.

The vaginal bacterial floras isolated from she-camels in this study were CoNs, E. coli, and Proteus spp. Streptococcus spp., Salmonella spp. and Klebsiella spp. The types of vaginal bacterial isolates in the current study are not in agreement reported from reproductive problems of dairy cows.71 From the present study isolates, Staphylococcus spp. which is considered pathogenic to the female genital tract was found to dominate over the others, followed by E. coli and Streptococcus species. These isolates of Staphylococcus species are important because Staphylococcus spp. live as commensals of the mucosa of reproductive and respiratory organs and based on a dominant slight agreement with the report Melaku et al31 isolated high proportions of Staphylococcus species from cows with a history of uterine infection.

Conclusion

Camel reproductive health problems affect reproductivity either by inducing infertility or sterility, which contributes to huge financial losses to pastoralists. The current investigation revealed that one or more bacterial isolates and different pathological lesions were recorded from the genital tract of female dromedary camels slaughtered at Jigjiga Municipal abattoir. During the postmortem examination, 36.0% of gross pathological lesions were recorded from sampled reproductive organs, and uterine lesions were the most prevalent ones. Additionally, eight different aerobic bacterial genera, namely, Staphylococcus aureus, E. coli, coagulase-negative Staphylococcus, Streptococcus, Salmonella, Proteus, Shigella, and Klebsiella species, were isolated from the genital tract of she-camel. In conclusion, more investigations that recruit a greater sample size in an extended study period should be performed using molecular pathology, microbial sequencing, and hormonal assay techniques. Any gynecological manipulations and procedures should be performed aseptically using sterile equipment. Moreover, the postpartum period should be properly managed, and if any signs of disorders are seen, they should immediately be treated. Provision of training for veterinarians and technicians working in pastoral areas that focus on reproductive health disorders of female dromedary camels.