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Abanico veterinario

On-line version ISSN 2448-6132Print version ISSN 2007-428X

Abanico vet vol.8 n.3 Tepic Sep./Dec. 2018

http://dx.doi.org/10.21929/abavet2018.83.2 

Original papers

Gastroenteric parasites, population haemonchus contortus in goats in semiarid climate of Bacum, Sonora, Mexico

Javier Munguía-Xóchihua1  * 

Ramón Navarro-Grave1 

Juan Hernández-Chávez1 

Ramón Molina-Barrios1 

Jesús Cedillo-Cobián1 

Javier Granados-Reyna1 

1Department of Agronomic and Veterinary Sciences. Technological Institute of Sonora. Sonora, Mexico

ABSTRACT

The gastrointestinal parasites (PGE), and in special Haemonchus contortus (HC) have been adapted to different ecosystems and cause direct and indirect damage to the goat production. In order to determine the frequency of PGE and parasitic burdens of HC in abomasum in naturally infected goats and sacrificed in a local slaughter in Bacum during 2015 to 2017, 1,823 feces samples were collected of adult goats. 815 (42.4 %) samples were positive to Strongylidea; 69 (3.69 %) were positive to Moniezia expansa and 5 (0.21 %) were positive to Skjabinema caprae. In the same period, 770 abomasums were collected and 447 (58.05 %) were positive to the presence of adult Haemonchus contortus. The parasitic burden of HC was 50,296: 33,222 (66.05 %) female and 17,074 (33.94 %) male. The parasite effects and its biotic potential of HC have been reviewed which represent the value of adaptation to different environments that allows the infection of new guests. It is concluded that the presence of PGE and the population of Haemonchus contortus in abomasum represent an abiotic potential essential for adaptation and survival in different environments.

Keywords: Biotic; Sonora; semiarid; abomasum; goat

INTRODUCTION

The production of goats in the south of Sonora State is generally carried out extensively, with grazing in daytime range and night enclosure. Its main income is based on a harvest kid, milk production and sale of animal waste. The economic gain depends on an adequate rainy season (availability of pasture or browse), health, nutrition, fertility and prolificity of the herd. Despite the environmental conditions gastroenteric parasites (PGE), have managed to adapt, creating endemic areas; this allows them to be exposed to infections that may be subclinically and clinically chronic in the abomasum, small intestine, large intestine and liver; competing for the few nutrients that the host gets from the characteristic vegetation of this ecosystem.

The parasitosis by PGE is considered a complex that affect the productive characteristics of the host, the animals reduce their consumption of food between 15 to 20 %, there may be cases of acute anorexia, tissue damage, anemia, toxemia and obstruction of organs (Angulo et al., 2010; Biswajit et al., 2017). Goats are very often affected by Haemonchus contortus throughout the world. It is of high prevalence in tropical and subtropical climate, but it has adapted to different climates (Simpson, 2000), it is a primary hematophagous pathogen, able to clinically and sub-clinically affect the young and adult population of goats; it decreases the efficiency of digestion (nitrogen digestible by 25 %) and the absorption of nutrients (Attindehou et al., 2012; Yacob et al., 2009), which reduces the energy metabolism of maintenance and production, which causes the cases of anemia that are common due to the severe loss of blood, while a decrease in feed intake and feed conversion causes weight loss in animals in production and often high mortality in young animals, causing significant economic losses (Vineer et al., 2016; Zvinorovaa et al., 2016).

In Bacum municipality, Sonora state, Mexico, despite having an arid and semi-arid climate, there are areas capable of maintaining populations of gastroenteric nematodes in the production of grazing goats, for which it is necessary to conduct studies on the characteristics of the natural infection of PGE and the population of Haemonchus contortus in goats, in this way to contribute parasitological knowledge in this ecosystem.

The objective was to determine the presence of gastroenteric parasites and the population of the abomasal nematode Haemonchus contortus, in goats in a semiarid climate of the Bacum municipality, Sonora, Mexico.

MATERIAL AND METHODS

To obtain the presence of PGE and the population of HC in abomasa, visits were made to the goat trail of the Bacum Municipality, Sonora, Mexico; in the years 2015, 2016 and 2017, where 1823 samples of feces and 770 abomasa of naturally infected goats were collected. They were identified and refrigerated to be transferred to the Parasitology Laboratory of the Department of Agronomic and Veterinary Sciences of the Technological Institute of Sonora, where the abomasa were incised along the greater curvature and washed slowly several times. The adult female and male parasites were collected in a Petri dish with a phosphate buffer (PBS, pH 7.2, 4 °C). They were washed at room temperature and identified based on their morphological characteristics (Attindehou et al., 2012; Akkari et al., 2013) they were counted in total and by sex (Yacob et al., 2009). The data obtained from Haemonchus contortus abomasum were used to calculate prevalence, mean intensity and abundance (infection rate) (Rashid and Irshadullah, 2018). The qualitative flotation technique was performed on the stool samples (Yacob et al., 2009); by means of the simple random sample formula, the sample size was determined (Petrie and Watson, 2010), it is an observational, longitudinal study (Thursfield, 2018). The results are shown in descriptive statistics (Wayne, 2014).

RESULTS AND DISCUSSION

The frequency of gastrointestinal parasites found when analyzing 1823 samples of feces of adult goats were positive, 815 to Strongylideos with 42.4 % that were distributed: in 2015 with 170 samples and 62 positive (36.47 %); in 2016 of 719 with 313 positive (41.53 %) and 2017 with 934 samples and 440 positive (47.1 %). In the total of the samples were found 69 positive (3.69 %) to Moniezia expansa and 5 positive (0.21 %) to Skrajabinema caprae.

This is one of the first reports of the presence of Strongylideos, Moniezia expansa and Skrajabinema caprae in goats in semi-arid climate of the study region.

It has been reported that Strongylideos are considered the most pathogenic and economically important in small ruminants, the most common are: Haemonchus spp, Trichostrogylus spp, Teladorsagia spp, Strongyloides spp, Trichuris spp, Bunostomum spp, Oesophagostomum spp, Cooperia spp and Nematodirus spp (Zvinorovaa et al., 2016).

A study carried out in goats from two communities in southern Africa shows the presence of Strongylideos, Eimeria spp, Strongyloides spp and Trichostrongylus spp (Rumosa et al., 2009). In Malaysia, a general prevalence of gastroenteric nematodes of 77.7 % is reported, in goats one year of age 87.8 %, adults 86.4 %, kids 53.1 %. The most frequent were Strongyloides spp. 14.3%, Trichostrongylus spp. 14.3 %, Haemonchus spp 9.0 %, and Trichuris spp 8.7 %; Eimeria spp 89.2 % in kids (Yusof and Lokman, 2016).

In a dairy goat farm, the presence of gastroenteric parasites is reported, with a prevalence of 58.31 %; Stronylideos (47.76 %), Strongyloides spp (15.83 %), Trichuris spp (7.12 %), Nematodirus spp (0.26%), Moniezia benedeni (10%), Skrajabinema spp (25.4%) and Eimeria spp (88.5%) were identified, (Alberti et al., 2012).

The distribution of gastroenteric parasites is wide, with adaptation in different ecosystems such as arid and semi-arid; where infections are common with different frequency throughout the year in goats to grazing, and they are an important limitation of productivity, by decreasing the consumption of food, with poor digestion of the little available forage, the pathophysiological damage show hematological changes in hemoglobin , hematocrit, white and red cell count; the protein metabolism is more affected and causes losses in the production of milk that contains less protein and fat; which decreases milk production, weight gain, reproductive problems and abortion (Torres-Acosta and Hoste, 2008, Alberti et al., 2012, Alberti et al., 2014, Fthenakis and Papadopoulus, 2017, Maheshika et al., 2018).

The presence of PGE can cause mortality of more than 40 % in young animals, losses of weight gain between 6 to 12 Kg per animal per year, or more than 40 %; food consumption and food efficiency are reduced, which lowers the productivity that causes significant economic losses (Vineer et al., 2016). The parasite-nutrition relationship decreases feed intake and the digestibility of nutrients by the host, reducing the productivity of goats (Zvinorovaa et al., 2016).

With respect to the revision of the abomasa, the presence of Haemonchus contortus was found and identified; Table 1 shows the frequency of Haemonchus contortus in abomasa, where the presence of the abomasal nematode is observed in the years under study. It is inferred that this nematode has managed to adapt to the arid and semi-arid conditions of the study region.

Table 1 Frequency of Haemonchus contortus in goat abomasa from Bacum, Sonora, Mexico 

Year Number Positive Percentage Negative Percentage
Number % Number %
2015-17 770 447 58.05 323 41.95
2015 499 307 61.52 192 38.48
2016 118 66 56.00 62 44.00
2017 153 74 48.00 79 52.00

Table 2 shows the total amount of Haemonchus contortus collected and differentiated by sex; it is shown that there is greater number of females than males.

Table 2 Population of Haemonchus contortus in goat abomasa from Bacum, Sonora, Mexico 

Year Positive Total Female Percentage Male Percentage
Abomasa Number Number % Number %
2015-17 447 50296 32222 66.05 17074 33.94
2015 307 33946 24693 66.83 12253 33.16
2016 66 5106 3522 69.00 1584 31.00
2017 74 8244 5007 61.00 3237 39.00

Table 3 shows the prevalence, intensity and abundance of Haemonchus contortus in the years of study, in the same way the presence of the abomasal nematode persists.

Table 3 Prevalence, intensity and abundance of Haemonchus contortus from 2015 to 2017 

Year Total Positive Prevalence Medium Abundance
Number Abomasum % Intensity
2015-17 770 447 85.05 112.51 65.31
2015 499 307 61.52 120 74.04
2016 118 66 55.93 77.36 43.27
2017 153 74 48.36 111.4 53.88

The biotic potential, range of adaptation to climatic factors, aptitude for hypobiosis and drug resistance are considered as adaptation factors of Haemonchus contortus. The biotic potential represents the value in an ideal situation of adaptation to the environment and it is always modified, reducing according to the environments and circumstances up to the survival limit of the species in each region (Romero and Boero, 2001, Biswajit et al., 2017).

Regarding the range of adaptation to climatic factors, it is reported that Haemonchus contortus infections present a well-defined pattern, where rain, humidity and temperature appear to be the greatest limitation in the frequency and parasitic load in the host. Within the environmental factors the development of the eggs becomes slow at low temperature and below 10 °C, the formation of L3 stops and the survival of the larvae; it is severely compromised with temperatures close to 0 °C. The temperature of 25-30 °C and 75-85 % of relative humidity with more than 50 mm of rain are more suitable factors for the development of the infectious stages of Haemonchus contortus (Chandana et al., 2015; Nahar et al., 2015; Zvinorovaa et al., 2016).

The third factor is the fitness for hypobiosis in the L4 state, within the mucosa of the abomasum is genetically determined and its presentation is conditioned by environmental factors that expose the larva outside the host. The larvae in hypobiosis allow them to survive external unfavorable periods, from the climatic point of view (Romero and Boero, 2001, Vineer et al., 2016).

Another factor of adaptation and survival of HC within the host, is the presence and population in abomasum that causes different lesions directly in the epithelium and gastric cells, which inhibits the secretion and function of gastric juices and increases serum concentrations of pepsinogen and gastrin , which affects the normal 2-3 pH of the abomasum which increases to 5-6, which is an adaptation of essential evolution to colonize an acid hostile environment for the nematode (Simpson, 2000); and favoring the permanence of the parasitic burden in the abomasum, allowing each female to manifest her fertility (Romero and Boero, 2001).

In this study, parasitic burden were higher in females than in males, as has been reported (Angulo et al., 2010). Within the characteristics of HC is a high fecundity and a short period of development, the infective phases that provide a great variability for adaptation (Emery et al., 2016), and survival to have more females that eliminate more eggs and there are more infective larvae (L3), in the grazing areas that favor the infection of new hosts giving continuity to the evolutionary cycle.

The variation in the frequency of HC parasitic burdens per year of study may be due to the difference in sample size, prevailing agroclimatic conditions at each time of year, nutritional status and availability of susceptible hosts. Factors such as age, race, nutrition and physiological state of the host influence the incidence and severity of the infection (Chandana et al., 2015, Vineer et al., 2016, Zvinorovaa et al., 2016). A significant ratio has also been found between the amount of infective larvae in the forage and the rains that cause stress to the host, which reduces their immunity and predisposes them to severe infections. It is important to consider that the amount and sex relations of adult parasites in abomasum can be used to estimate the adaptation of the host-parasite ratio (Angulo et al., 2010).

The abomasal nematode Haemonchus contortus has a high biotic potential, so it can quickly reach high parasitic burdens that affect health and limit productivity; due to the association of damages, production detriment, morbidity (number of infected animals), mortality; coupled with the cost of control with chemical treatments, direct and indirect losses occur (Attindehou et al., 2012; Zvinorovaa et al., 2016), which are important for low productivity, profitability and sustainability of goat production.

CONCLUSION

The presence of gastroenteric parasites was determined; the population of Haemonchus contortus in abomasum that have adapted to the semiarid climate of Bacum, Sonora, Mexico was identified and determined.

Acknowledgement

The authors are grateful for the support to the donation granted by the Program for the Promotion and Support of Research (PROFAPI) and the Program for the Strengthening of Educational Quality (PFCE), of the Technological Institute of Sonora.

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Received: February 26, 2018; Accepted: May 25, 2018

*Responsible and correspondent author: Munguía-Xóchihua Javier. Department of Agronomic and Veterinary Sciences of the Technological Institute of Sonora. February 5, 818 south Colonia Centro. Ciudad Obregón, Sonora, Mexico. CP 85000. E-mail: javier.munguia@itson.edu.mx

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