Research and implementation of novel approaches for the control of nematode parasites in Latin America and the Caribbean: Is there sufficient incentive for a greater extension effort?

Torres-Acosta, J.F.J.; Molento, Marcelo Beltrão; Gives, Pedro Mendoza de

doi:10.1016/j.vetpar.2011.11.053

Cited by 37 publications

(22 citation statements)

References 119 publications

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“…A high variability in resistance-susceptibility to gastrointestinal nematodes (GIN) occurred in Katahdin × Pelibuey lambs after grazing. control these parasites (Torres-Acosta et al 2012). Some strategies to reduce the parasitic burden in the animals have been proposed: selective deworming (Besier et al 2010), vaccination (Arunkumar et al 2012), medicinal plants (Sawleha et al 2010), cooper oxide needles (Vatta et al 2009) and biological control (Waller 2006).…”

Section: Introductionmentioning

confidence: 99%

Variability in the fecal egg count and the parasitic burden of hair sheep after grazing in nematode infected paddocks

2013

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Pesq. Vet. Bras. 33(4): 469-475, abril 2013 469 INTRODUCTIONThe frequent and continuous use of chemical anthelmintic drugs for deworming sheep flocks has resulted in the presence of lateral and multiple anthelmintic resistance in the parasites. This resistance leads to a concerning ineffectiveness of anthelmintics with large economic losses in sheep productivity (Coles et al. 2006, Papadopoulos 2008, Sargison 2011. Twenty-four countries have reported the presence of nematodes resistant to several anthelmintics (Jabbar et al. 2006). This situation has motivated workers around the world to search for alternative strategies to Variability in the fecal egg count and the parasitic burden of hair sheep after grazing in nematode infected paddocks 1Roberto González-Garduño 2 *, Pedro Mendoza-de Gives 3 and Glafiro Torres-Hernández 4ABSTRACT.-González-Garduño R., Mendoza- This study aimed to evaluate the variability in the fecal egg count (FEC) and the parasitic burden of naive hair sheep after grazing in nematode infected paddocks. The research was carried out in Tabasco, Mexico, during two periods (August and December). In each period 32 lambs were grazed for one month on African star grass (Cynodon plectostachyus) contaminated with gastrointestinal parasitic nematodes. FEC, packed cell volume (PCV) and body weight (BW) were recorded. Gastrointestinal worms were recovered at necropsy. Data were analyzed with the MIXED procedure of SAS using a model of repeated measurements over time. A higher number of Haemonchus contortus worms was found in December (2814±838) than in August (1166±305). The opposite occurred with Cooperia curticei (2167±393 and 3638±441, respectively). The FEC and correlation coefficient in respect to the worm burden were higher in December (6516 ± 1599, r=0.83, respectively) than in August (4364±771, r=0.44, respectively). A high variability in resistance-susceptibility to gastrointestinal nematodes (GIN) occurred in Katahdin × Pelibuey lambs after grazing.

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Section: Introductionmentioning

confidence: 99%

Variability in the fecal egg count and the parasitic burden of hair sheep after grazing in nematode infected paddocks

2013

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“…In the past, nematode infestation was successfully controlled by anthelmintics drugs but nowadays there has been a development of drug resistance by the adult stage (Soto-Barrientos et al, 2011;Torres-Acosta et al, 2012). In most goats and sheep in tropical and sub-tropical regions, total failure of broad spectrum anthelmintics is a reality of rapidly increasing dimensions.…”

Section: Discussionmentioning

confidence: 99%

Effect of Celmanax on feed intake, live weight gain and nematode control in growing sheep

Nde¹,

Verla²,

Chimonyo³

et al. 2014

Afr. J. Agric. Res.

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The role of yeast supplementation in small ruminants on rumen fermentation, animal performance, and nematode control is still unclear. The effect of Celmanax ® (yeast culture product) in two diets using lambs on body weight gain, rectal temperatures and nematode loads were monitored. 24 sheep (17 ± 2.8 kg BW), housed in individual pens, were divided into four treatments and fed on four basal diets; lucerne meal (LC), lucerne meal plus Celmanax ® (LCC), sunflower meal (SF), and 4 sunflower meal plus Celmanax (SFC), for 96 days including 14 days adaptation. Dry matter intake, average body weight gain and feed conversion efficiency were calculated. Rectal temperatures and nematode egg count/gram (EPG) were measured once a week. Feed intake was higher (P < 0.05) in LCC and SFC than in LC and SF, respectively. Overall, weight gain was higher in SFC (P < 0.05) than SF. Feed conversion efficiency was higher (P < 0.05) in LCC than LC. Nematode EPG were lower (P < 0.05) in Celmanax ® supplemented diets (LCC and SFC) than in their controls. Rectal temperatures dropped (P < 0.05) in Celmanax ® diets. These findings suggest that, Celmanax ® has the potential of improving animal performance and may be used in conjunction with other anthelmintics to control nematodes.

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“…Control of these parasites has relied primarily on the intensive use of anthelmintic drugs such as benzimidazole drugs (BZ), primarily albendazole, oxfendazole, and fenbendazole; macrocyclic lactones such as ivermectin and imidazothiazole; and tetrahydropyrimidine derivatives such as levamisole and morantel-tartrate 3 . Nevertheless, with the continuous use of these anthelmintic drugs, anthelmintic resistance (AR) has developed in parasites [4][5][6][7][8][9][10] . In particular, the anthelmintic resistance AR of gastrointestinal nematodes (GIN) in sheep occurs globally and is described as a major threat to sheep production 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, gastrointestinal nematodes were resistant to benzimidazole on all farms assessed with a previous history of benzimidazole use in ithuanian sheep 13 , and in many flocks in India (14) . Moreover, AR reaches high levels in Asia, Latin America, Africa, Australia, and New Zealand, in addition to regions that rely on small ruminants as one of the primary sources of animal protein [4][5][6][7][8][9][10] . In Mexico, low resistance to benzimidazole was demonstrated in southeastern Mexico in 2003, but the authors warned that resistance could increase due to the continuous use of benzimidazole derivatives 15 .…”

Section: Introductionmentioning

confidence: 99%

“…In Mexico, low resistance to benzimidazole was demonstrated in southeastern Mexico in 2003, but the authors warned that resistance could increase due to the continuous use of benzimidazole derivatives 15 . The warning was accurate, and AR in grazing ruminants is currently increasing in Mexico 7,8,16 . For the prevention and management of AR, important considerations are the frequency of the development of anthelmintic drug resistance and the extent at which it spreads 17,18 .…”

Section: Introductionmentioning

confidence: 99%

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Anthelmintic resistance status of gastrointestinal nematodes of sheep to the single or combined administration of benzimidazoles and closantel in three localities in Mexico

et al. 2016

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Sheep production requires the constant assessment of parasitic burden and the efficacy of existing treatments for proper management. In this study, the administration of five different treatments was evaluated for the reduction of the percentage of eggs per gram of feces (EPG) shed by gastrointestinal nematodes (GIN) from sheep on three different sheep-breeding farms in Mexico (Texcoco, Estado de Mexico; Hueytamalco, Puebla; and Tlaltizapán de Zapata, Morelos). In these farms, ivermectin and benzimidazole derivatives had been routinely administered for two consecutive years. To determine whether drugs with different pharmacological properties decreased GIN fecal egg excretion, the treatments closantel (CLOS), albendazole (ABZ) and fenbendazole (FBZ) were administered alone and in combinations of CLOS + ABZ and CLOS + FBZ, to five groups of sheep, with an additional untreated control group on each farm (n = 28 per flock). Anthelmintic resistance was determined using Fecal Egg Count Reduction Tests (FECRT) as recommended in the guidelines of the World Association for the Advancement of Veterinary Parasitology. Fecal samples were collected 14 and 21 days after treatment. The anthelmintic resistance status was determined based on the reduction in the fecal egg count arithmetic mean and 95 % confidence limits. According to the FECRT, resistance developed to CLOS, ABZ, FBZ and CLOS + FBZ because the mean percentage of EPG reduction was ≤ 95 % with a lower confidence limit of ≤ 90 %. By contrast, nematode susceptibility was confirmed for the CLOS + ABZ combination, as it reduced the percentage of GIN fecal egg output by 96.46 ± 3.04 % (day 14) and 96.88 ± 3.04 % (day 21). Based on the morphometric identification of larvae, Haemonchus spp., Cooperia spp. and Teladorsagia spp. were the most abundant genera on all farms before the administration of these five treatments. In conclusion, the use of the anthelmintic combination of closantel plus albendazole may reduce the development of anthelmintic resistance in gastrointestinal nematodes.

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Research and implementation of novel approaches for the control of nematode parasites in Latin America and the Caribbean: Is there sufficient incentive for a greater extension effort?

Cited by 37 publications

References 119 publications

Variability in the fecal egg count and the parasitic burden of hair sheep after grazing in nematode infected paddocks

Variability in the fecal egg count and the parasitic burden of hair sheep after grazing in nematode infected paddocks

Effect of Celmanax on feed intake, live weight gain and nematode control in growing sheep

Anthelmintic resistance status of gastrointestinal nematodes of sheep to the single or combined administration of benzimidazoles and closantel in three localities in Mexico

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