Sero-epidemiological Studies on Goat Hypodermosis in Northern Upland Balochistan, Pakistan.
Abstract Sero-epidemiological studies were conducted on goat warble fly, Przhevalskiana silenus, to observe the prevalence of hypodermosis in district Ziarat, northern upland of Balochistan, Pakistan during April 2011 to March
The most prevalent breed of goat 'khurasani' was involved in the study and compared with the non-descript breed of goat. In the first study a total of 2880 (240 animals per month) goats of different age, sex and breed were examined on monthly bases. The mean percentage was 21.25% with the highest prevalence in January and lowest in October. Three age groups were selected for the study i.e. Less than 1year, 1-2 year and Greater than 2 year old in which the highest percentage was noted in 1-2 years of age group.
No significant differences were observed between both sexes and both breeds. In the second study, sero-prevalence was studied by commercial ELISA kit. A total of 480 sera samples were collected during April 2011 to March 2012. Three hundred and eight (64.16%) samples were found sero-positive. Data analyzed by Pearson chi-square test (Chi2) revealed significant difference (PLess than 0.05) month-wise in the prevalence studies.
It is concluded that the commercial ELISA kit is a useful tool for the serodiagnosis of goat warble fly infestation which provides a base line data for the control and future eradication program of this economically important parasite.
Keywords: Sero-epidemiology, goat hypodermosis, ELISA, upland Balochistan.
Among the common ectoparasites of goats, warble fly, Przhevalskiana silenus, commonly exists in Pakistan (Shah et al., 1981; Khan et al., 1991; Ayaz, 1998) which belongs to order Diptera family Oestridae.
An adult female lays 100 eggs (Sayin et al., 1973) from which first instar larvae (L1) hatch in 5 to 6 days and penetrate into the skin by means of paired mouth hooks and collagenase enzymes, hypodermine C (Madel and Nahif, 1971).
First instar larvae (L1, May to October) moult to second instar (L2, October to December) and then to third instar (L3, January to March) in the subcutaneous tissues of the back and flank region of the goats (Otranto and Puccini, 2000), drop on the ground and
pupate from which adult flies emerge (Tassi et al.,
It is economically a very important fly whose larvae are obligatory parasites of their hosts and cause severe damage to the skins affecting leather industry. This infection was first reported in Italy (Brauer, 1858).
In the province of Balochistan 11.8 million of
goats are raised (GOP, 2006). Khurasani is one of the major breeds of goat mainly raised for mutton and hair (Anonymous, 2002b; Munir et al., 2010).
The northern uplands of Balochistan including Khurasan, Toba Kakari, Suleiman mountains region of Zhob and Sherani districts, Qilla Saifullah, Loralai, Ziarat and Pishin districts are the main habitats of the Khurasani breed. Phenotypically this breed is having long black hair coat and turned back horns.
The breed is predominantly black in color with red face but some other color may be found occasionally. The animal is smaller in size and good in milk production (0.9-1.3L/day). The hair is used for ropes, rugs and tents (www.pastoralpeoples.org/ docs/CGRFA_LIFE_sideevent_kakar.pdf.).
Skins and wool from small ruminants provide raw material for the leather and wool-garment industries, respectively. The traditional woolen blankets and rugs are major source of extra income for families dependent on livestock in Balochistan (Anonymous,
The husbandry practices play important role in the exposure of the parasite. Animals in uplands of Balochistan are mostly dependent on open grazing system, one of the most important factors for warble fly infestation (Otranto et al., 2005), thus continuously exposed to warble fly infestation.
Kidding period in uplands is from March to April while the adult fly activity season starts after mid April. Kids are mostly not exposed to grazing because they are usually kept in door for a few months from birth to weaning age. They come in contact with their dams during night when their dams come back after grazing at sun set.
Goat warble fly infestation has severe economic impact on tanning industries, impaired milk and meat production, growth retardation and also carcass depreciation (Oryan et al., 2009). The livestock in Pakistan produces 36.3 million numbers of skins and 7.5 million numbers of hides annually which are important export items of livestock industry that contribute 12 percent of the total export (Anonymous, 2003).
Export of leather and leather products are Pakistan's one of the largest source of foreign exchange (Anonymous, 2002a). The warble fly infested skin reduces the prices up to
70% depending upon the numbers of holes formed by the larvae of warble fly (Anonymous, 2008).
The poor quality of hide and skin is the most important constraint affecting the marketing of hides and skins which is due to warble fly infestation along with other factors including poor flaying techniques and improper preservation (Shafiq and Kakar, 2006).
The diagnosis of warble fly infestation in the
past was entirely relied on palpation of the warbles in the backs of the animals or visual examination of the carcasses in the slaughterhouses in which the infections were usually underestimated and neglected.
However, sensitive and reliable immunological techniques such as enzyme linked immunosorbant assay (ELISA) have solved this problem and can detect the infected animal
accurately (Sinclair and Wassall, 1983, Sinclair et al., 1984).
Serological studies were conducted by commercial ELISA kit (Otranto et al., 1999, 2005; Faliero et al., 2001) which was basically developed for bovine hypodermosis (IDEXX hypodermosis serum antibody test) but has also been validated for use in goats, deer, camel and men (Morsy et al.,
1999; Dominguez et al., 2010; Panadero et al.,
2010; Puente et al., 2010).
Although several studies have been
conducted on epidemiology, taxonomy, biology, histopathology, economic losses, and immunology of warble fly infestation in bovines, very little attention has been given to caprine hypodermosis in Pakistan, particularly in the province of Balochistan.
Keeping in view the importance of warble fly infestation in livestock, the present study was undertaken in northern upland of Balochistan, Pakistan. It is expected that the result of this study will be helpful providing the base line data to plan better control and eradication measures of warble fly for further improvement in the livestock sector of Balochistan, Pakistan.
MATERIALS AND METHODS
Studies were conducted on sero- epidemiology of warble fly infestation in goats in district Ziarat, northern uplands of Balochistan, Pakistan. The duration of the study was one year commenced from April 2011 to March 2012.
Profile of the study area
District Ziarat is located at 30deg 22' 47 N 67deg
43' 38 E with an altitude of 2543 meters (8346 ft).
It comprised an area of 1489 km2, with climate mild in summer and freezing cold in winter. The area is refreshingly cool in summer, from May to August. It starts getting cold in September and is extremely cold during November to March. In winter, it gets a good amount of snowfall.
Average rainfall is 20.60 mm. The months of January to March in winter and July and August in summer receive most of the rainfall. Ziarat is also very famous for its juniper forest.
Juniper species Juniperous macropoda, Juniperous exceisa polycarpus or Pashthani juniper are found in Ziarat districts and Zarghoon mount and some other mounted areas of Balochistan known as the second largest juniper forest in the world, which covers an area of about 247,000 acres (1,000 km2).
The other major species are wild ash, wild almond, Olea species, Khujak and Ephedra sinica. Artimisia maritime, Cymbopogon, Crysopogoneri (Anonymous, 1997b).
Table I.- Distribution of goats according to breed, age and sex for warble fly examination.
Breed Age Sex Total
(Years) Male Female
Khurasani Less than 1 Year 240 240 480
(40/monthx12) (20/Month (20/Month
x 12) x 12)
1-2 Year 240 240 480
(40/monthx12) (20/Month (20/Month
x 12) x 12)
Greater than2 Year 240 240 480
(40/monthx12) (20/Month (20/Month
x 12) x 12)
Non Less than 1 Year 240 240 480
descript (40/monthx12) (20/Month (20/Month
x 12) x 12)
1-2 Year 240 240 480
(40/monthx12) (20/Month (20/Month
x 12) x 12)
Greater than2 Year 240 240 480
(40/monthx12) (20/Month (20/Month
x 12) x 12)
Total 1440 1440 2880
In the first study, a total of 2880 goats of different age group (Less than 1year, 1-2 year and Greater than 2 year), sex and breed were examined by hand palpation method using cluster sampling technique (Thrusfield, 2007). The detail is given in Table I. To meet the required sample size fulfilling the criteria of age, sex and breed, several flocks of different sizes (ranged from 50 to 250 heads per flock) were selected from the whole population.
Age was determined by incisor teeth in the lower jaw (Khan, 1969). Breed identification was accomplished from their phenotypic characteristics (Hasnain, 1985). Second study was conducted on month-wise sero- prevalence by commercial ELISA kit method (Otranto et al., 1999, 2005; Faliero et al., 2001).
A total of 480 blood samples (40 samples per month, regardless of breed, age and sex) were taken randomly. Blood sample were not concerned whether the goat is having lesions or not but were also included in the prevalence study to correlate the two methods. The animals selected for blood sampling were neither re-sampled monthly nor physically examined for the lesions. Sera were separated after the blood samples have been clotted and centrifuged where necessary (Cencek and Ziomko, 2002).
The sera were stored at -20degC until further use (Boulard and Villejoubert, 1991; Otranto et al., 1999; Ahmed et al., 2011).
The test was performed according to the protocol of manufacturer of the kit
To determine the significance of difference in prevalence among different variables like month, age, sex and breed, Pearson chi-square (Chi2) test was applied (Otranto and Puccini, 2000, Khan et al., 2006; Azizi et al., 2007; Panadero, 2010) by SPSS, version 16.
Month, breed, age and sex-wise prevalence of
goat hypodermosis was studied in district Ziarat during April 2011 to March 2012 (Table II). The prevalence of palpable lesions was highly seasonal, as lesions were detected only between October 2011 and February 2012.
The highest prevalence of goats with palpable lesions was 66% in January 2012. There were no significant effects of breed or sex but the prevalence was significantly higher in 1-2 years old goats than in either those Less than 1 year- or Greater than 2 years old.
In the second study, significant difference was observed in sero-prevalence among the months with the highest (92%) value during November and lowest (20%) during March (Table III) with a mean of 64.12%.
Although there were no obvious clinical palpable lesions from March to September in the palpation method, the larvae at that time were at subclinical stage (L1) which were detected by serological test (ELISA) to compare the serological (sub-clinical) and palpation (clinical) methods regarding early detection of the infestation.
Month-wise analysis of data revealed significant differences (PLess than0.05) both in the prevalence and sero-prevalence (regardless of breed,
Table II.- Month, breed, age and sex-wise prevalence of goat hypodermosis in district Ziarat during April 2011 to March 2012.
Breed Age (Years) Sex
Khurasani Less than1 1-2 Greater than2 Male Female percentage (%) Ranks
April 2011 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
May 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
June 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
July 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
August 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
September 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
October 37.5 35.0 22.5 61.25 25 36.7 35.8 36.25 1656.50d
November 49.2 43.3 32.5 71.25 35 49.2 43.3 46.25 1800.50c
December 52.5 48.3 37.5 77.5 36.25 49.2 51.7 50.41 1860.50bc
January 2012 70.0 61.7 53.75 88.75 55 65.8 65.8 65.83 2082.50a
February 61.7 50.8 46.25 80 42.5 55.8 56.7 56.25 1944.50b
March 0.0 0.0 0 0 0 0.0 0.0 0.0 1134.50e
Total 22.6 19.9 16.04 31.56 16.14 21.4 21.1 21.25
Mean ranks with different superscripts (abcde) in each row indicate significant difference (PLess than0.05) between months.
Table III.- Month-wise seroprevalence of goat hypodermosis in district Ziarat.
April 2011 40 _ _ 87.00e
May 40 23 57.5 225.00c
June 40 26 65 243.00bc
July 40 30 75 267.00b
August 40 32 80 279.00ab
September 40 34 85 291.00ab
October 40 30 75 267.00b
November 40 37 92 309.00a
December 40 28 70 255.00b
January 2012 40 34 85 285.00ab
February 40 26 65 243.00bc
March 40 8 20 135.00d
Total 480 308 64.16
Mean ranks with different superscripts (abcde) in each row indicate significant difference (PLess than0.05) between months. age and sex) of goat hypodermosis. In the study of palpation method there was also significant difference (PLess than 0.05) amongst age groups, while no significant difference was observed between both sex and breeds.
The sero-epidemiological studies provide the initial and baseline data to plane better strategies for the control and eradication of a disease in the country. The present study on goat hypodermosis was therefore carried out for the first time in district Ziarat, northern upland of Balochistan, Pakistan, to estimate the infestation rate and to diagnose the
larvae by ELISA at the earlier sub-clinical stage.
There are many factors that contribute in the prevalence of warble fly infestation. Among those one of the important factors include grazing pattern (Otranto et al., 2005, Ahmed et al., 2013). Animals in the study area are mostly dependant on rangeland grazing, thus continuously exposed to warble fly infestation which agrees with the study conducted in Italy where the seroprevalence was highly correlated with the free grazing practices (Frangipane di Regalbono et al., 2003).
Month-wise, age-wise, sex- wise and breed-wise prevalence was studied by examining goats in the field. Significant differences were observed in the prevalence among months in one year study. The higher prevalence was observed from November to January which is almost similar to the studies of Fuente-Lopez et al. (2001) in which variations in prevalence were observed between seasons, with higher values from November to February, and maximum of 94.4% prevalence in November.
The present study also coincides with that of Khan et al. (2006) in which highest month- wise prevalence was recorded in December and the lowest in July. The month-wise prevalence under agriculture linkage program (ALP) project in Balochistan also showed highest prevalence during November and January in various areas of the province (Anonymous, 2008).
Prevalence was determined in three different age groups (Less than 1year, 1-2 year and Greater than 2 years) of goats. Significant differences were observed in prevalence among these age groups with highest in
1-2 years old goats than Less than 1year or Greater than 2 years old. This is in agreement with the studies conducted in various regions of the world (Murray, 1967; Robertson, 1980; Yadav et al., 2006; Azizi et al., 2007; Oryan et al., 2009; Hassan et al., 2010; Ahmed et al., 2013).
Adults showed a significantly low infection in the field animals. In cattle and goats hypodermosis, the younger animals are more susceptible than repeatedly exposed older animals and has a higher mean intensity of parasitism than older animals (Tarry, 1987; Puccini et al., 1987) because an acquired resistance is established in older cattle after two or three repeated infestations (Boulard, 1987; Oryan et al., 2009; Hassan et al., 2010, Ahmed et al., 2013).
These observations were also in agreement with the studies conducted in some other parts of the world (Fuente-Lopez et al., 2001). Oryan et al. (2009) studied that 25% of the larvae were dead in older goats while in younger goats the percentage of dead larvae was 10%.
Lower prevalence in older age group may also be due to thickness and hardness of the skin from which the larvae cannot penetrate easily as compared to the younger age group (Oryan et al., 2009).
In a study conducted by Asbakk et al. (2005), anti-hypoderma antibody level (10%) in adults declined significantly with age, and levels were significantly lower in animals of 4 to 11 years of age than in one year old animals during the same one year period.
In animals less than one year of age, the prevalence was significantly lower than the age group of 1-2 years. Kidding period in the study area is from mid March to mid April (spring season), while hypoderma is in pupal stage at this time and the adult fly activity season (oviposition) is in the mid of April (early summer).
The age group less than one year was mostly not exposed to grazing, because the kids are usually kept indoor for a few months from birth to weaning age and until that time the adult fly activity season had finished.
This is also supported by other studies (Fuente-Lopez et al., 2001; Oryan et al., 2009; Otranto et al., 2005) in which the prevalence was low in age group of less than one year.
No significant difference was observed in prevalence between either sexes which agrees with the studies conducted in different countries of the world (Perez et al., 1995; Rahbari and Ghasemi, 1997; Fuente-Lopez et al., 2001; Yadav et al., 2006; Oryan et al., 2009). Similarly there was no significant difference in the breeds as reported by Yadav et al. (2006).
Serological technique such as ELISA has been shown to detect the infected animal accurately and it has been used in many parts of the world for the detection of warble fly infestation. It is simple, rapid, useful tool and a good alternative of clinical palpation method (Panadero et al., 2010).
Based on ELISA, the warble fly has been eradicated from many northern European countries including Denmark, Netherland, the Czech Republic, Germany, France, Switzerland (Otranto et al., 2005), United Kingdom and Ireland (Colwell and Otranto, 2008).
The commercial ELISA kit developed for bovine hypodermosis can be considered as a useful tool for the serodiagnosis of goat warble fly infestation due to the confirmed cross-reactivity between the antigen of Hypoderma lineatum and anti-P. silenus antibody and the simplicity and the rapidity of the assay (Faliero et al., 2001; Otranto et al., 1997, 2004).
Hypodermin C (HyC) is found in several hypoderma species and has been used widely in serological diagnosis of hypodermosis. This enzyme can be used from one species for the serodiagnosis of hypodermosis caused by other species (Asbakk et al., 2005).
In an experimental infestation technique, cross- transmissional study of Hypoderma lineatum from cattle to domestic goats was conducted in which the appearance of antibodies on ELISA suggested that some larvae survived enough to initiate a humoral immune response (Colwell et al., 2006).
The results of other studies confirmed that the first instar antigen of H. lineatum can also be used to diagnose natural infection by H. actaeon in deer and H. sinense in man (Dominguez et al., 2010; Panadero et al., 2010; Puente et al., 2010). There are also cross reactions between anti-hypoderma antibodies and antibodies against both Przhevalskiana silenus and Cephalopina titillator (Morsy et al., 1999).
In the present study the overall mean sero- prevalence was 64.16%. The height of district Ziarat is 2543 meters above sea level and this high seropositivity percentage is directly related to the altitude which was also observed by Faliero et al. (2001) that in the mountainous areas seropositivity percentage is greater than the semi hilly and plane areas due to free grazing practices (Otranto et al., 2005) and more favorable conditions for the development of the larvae into adult flies.
The antibody titer was elevated with the migratory phase of first instar larvae (L1). This is also supported by a sero-epidemiological survey which demonstrated that the kinetics of anti-hypoderma antibodies in yaks and cattle were elevated from October to December, coinciding with the migration of L1 and that the serosurveillances and chemical therapy would best be performed in these months in the region (Guan et al., 2005).
Same observations were also recorded in Italy (Otranto et al., 1998) in which the highest antibody titer was recorded from October to November that coincided with the migration of the larvae inside the animal's body.
These months were found suitable sampling period for immunodiagnostic and immunoepidemiological studies of goat warble fly infestation.
These observations are also in agreement with the study conducted on antigen capture ELISA for the detection of hypoderma antigen (hypodermin C) in which the levels of antigen fell quickly following arrival of grubs at the back and completion of the molt to second instar (Panadero et al., 2002).
In a study the antibody levels rose after infestation and reached a maximum in November and December, which coincides with the end of migratory phase of H. tarandi larva after it has reached its final site under the skin of the back of animal (Asbakk et al., 2005).
They further stated that the antibody level decreases or stops when L1 moults to L2 and L3 because hypodermin C encoding gene stops functioning and the secretion of hypodermin ceases. In Canada an experimental infestation of cattle with hypoderma spp. was conducted in which the peak of antibody production was observed when the antigen levels were at peak during migration of first instar larvae to the back of animals but as larvae molted to L2, the antigen production ceased and there was a
persistence level of antibody (Colwell et al., 2008).
Faliero et al. (2001) and Otranto et al. (2004) stated that ELISA test was found to be an easy and economical tool for goat warble fly infestation. The antibodies became lost from the circulation of the infested animals about 14 weeks after the disappearance of the infection (Sinclair et al., 1984; Boulard and Villejoubert, 1991).
In Iran the occurrence of goat grubs infestation started from July, reached at peak in September and October, and then declined in February (Rahbari and Ghasemi, 1997). It is concluded that the best treatment time for goat hypodermosis in uplands of northern Balochistan is during June to July when the first instar larvae are still in migratory stage and have not yet caused damage to the skin.
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