Gastrointestinal nematode infections in sheep raised in Botucatu, state of São Paulo, Brazil

Wilmsen, Maurício Orlando; Silva, Bruna Fernanda da; Bassetto, César Cristiano; Amarante, Alessandro Francisco Talamini do

doi:10.1590/s1984-29612014058

Cited by 27 publications

(22 citation statements)

References 17 publications

(16 reference statements)

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“…In some tropical areas, sheep may acquire massive GIN infections year-round (Wilmsen et al, 2014). In such conditions, grazing management to decontaminate the pasture might be a feasible option for controlling GIN parasitism.…”

Section: Introductionmentioning

confidence: 99%

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Almeida

Piza

Bassetto

et al. 2018

Small Ruminant Research

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Lamb performance was evaluated in four integrated crop-livestock (ICL) systems. The ICL areas were previously planted with maize and marandu palisade grass in December 2013. ICL systems 1 and 2 were also seeded with pigeon pea. After harvesting in April 2014, black oats were sown in rows (ICL 1 and 3) or by broadcast seeding (ICL 2 and 4). Each ICL area was divided into 12 paddocks of 225 m 2 to be grazed by young sheep from July 23 to September 30, 2014. To determine if the pasture remained contaminated by free-living stages of sheep gastrointestinal nematodes (GIN) after approximately ten months without animals in the area, 12 worm-free "tracer" lambs (n = 3/ ICL system) grazed each ICL pasture for 14 consecutive days in July 2015 and were later housed in pens, where they remained for another 14 days. The tracer lambs acquired no worm infections, demonstrating that the area was cleared after 300 days without animals. To evaluate GIN infection and uncastrated male lamb performance, we used 60 (n = 15/ system) Poll Dorset x Corriedale (crossbred) sheep with mean body weights of 24.4 ± 3.4 kg from July to September 2015 and 48 (n = 12/ system) Texel x Corriedale sheep with body weights of 26.4 ± 3.5 kg from June to September 2016. Lambs were allocated to the following groups: Group 1 rotated on the 12 ICL1 paddocks; Group 2 rotated on the 12 ICL2 paddocks; Group 3 rotated on the 12 ICL3 paddocks; and Group 4 rotated on the 12 ICL4 paddocks. Each paddock was grazed by sheep twice for three days, with a 33-day interval between grazing. At the end of the day the lambs were supplemented with concentrate plus silage. Groups 1 and 2 received mixed silage made of maize, marandu palisade grass and pigeon pea and groups 3 and 4 received mixed silage made of maize and marandu palisade grass. Faecal and blood samples were taken from all the animals every two weeks, and body weight was recorded on the same occasion. Nematode faecal egg counts (FEC), packed cell volume and total plasma protein means did not differ (P > 0.05) between the four lamb groups. In 2015, throughout the experimental period, the FEC decreased in all animals, with 6733 and 1407 eggs per gram (EPG) on average at the beginning and end of the trial, respectively. At the beginning of the trial in 2016, the animals had mild GIN infections (1077 EPG on average), and the individual faecal egg counts did not exceed 10,000 EPG during the trial. In decreasing order, Haemonchus spp., Trichostrongylus spp. and Cooperia spp. third stage larvae were found in the faecal cultures in both years. The performance of lambs were similar in the four ICL systems (P > 0.05), in the first and second years, the daily weight gains were 0.192 ± 0.05 kg and 0.221 ± 0.06 kg, respectively. In conclusion, a period of withdrawal of contaminated sheep results in plots free of infective larvae. The use of clean pastures during the dry season, in the different ICL systems, associated with a good nutrition plan, resulted in progressively declining degrees of GIN infections and satisfactory ...

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Section: Introductionmentioning

confidence: 99%

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Almeida

Piza

Bassetto

et al. 2018

Small Ruminant Research

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“…A raça Dorper apresenta alta taxa de desenvolvimento de carcaça com boa conformação, sendo muito utilizada em cruzamentos com ovelhas de raças nativas do Nordeste, tais como a Santa Inês, em virtude do seu porte e da velocidade de crescimento (Carneiro et al 2007). Também já foi descrito que características genéticas da raça Dorper conferem maior resistência a parasitos gastrointestinais (Benavides et al 2015), o que torna essa raça de alto interesse para criação em regiões brasileiras caracterizadas por alta infestação com esses parasitos (Wilmsen et al 2014). Com o objetivo de aumentar a produção de carne ovina, aumentou-se o interesse no monitoramento da sanidade do rebanho, utilizando diversas ferramentas como auxiliares no diagnóstico clínico, tais como os intervalos de referência para metabólitos sanguíneos (componentes hemato-bioquímicos) (Peixoto & Osório 2007).…”

Section: Introductionunclassified

Determinação de valores de referência séricos para os eletrólitos magnésio, cloretos, cálcio e fósforo em ovinos das raças Dorper e Santa Inês

et al. 2016

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The sheep industry in Brazil is an important economic activity, and with the increasing global demand for sheep meat there is a great interest in the monitoring of the herd health, and serum reference ranges are basic tools for veterinary clinical pathology assays. Mineral elements correspond to 2-5.5% of the body of vertebrates, holding different functions in their physiology. The objective of this study was to obtain reference intervals of the electrolytes magnesium, phosphorus, chloride and calcium for the Dorper and Saint Ines sheep breeds. Sera samples were collected from 487 clinically healthy sheep, 146 from Dorper and 341 from Santa Ines breed. Electrolytes were measured using commercial kits. Data were analyzed taking the race, sex and age variables in account, and reference ranges were established. The results revealed significant statistical differences in reference ranges obtained for the electrolytes calcium and magnesium concerning the variable race, and for the electrolyte phosphorus in the variable age and, when compared with reference values already published, proved the existence of significant differences.

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“…Among the four species of Cooperia recorded in the present study, only Cooperia curticei was reported in sheep raised in the absence of cattle in São Paulo State (AMARANTE et al, 2004(AMARANTE et al, , 2009WILMSEN et al, 2014). The other three species detected, C. punctata, C. pectinata and C. spatulata, are commonly found in cattle in Brazil (LIMA, 1998;BRICARELLO et al, 2007;SANTOS et al, 2010;BASSETTO et al, 2014).…”

Section: Discussionmentioning

confidence: 45%

“…We found a relatively high number of nematode species (13 total species) infecting the sheep. In contrast, Amarante et al (2004) and Wilmsen et al (2014) reported only five nematode species in sheep that grazed alone in São Paulo State. When sheep share pasture with cattle, which was the case in the present study, the helminth species diversity is higher.…”

Section: Discussionmentioning

confidence: 94%

“…In the present study, H. contortus and T. colubriformis were the major gastrointestinal parasites in sheep. These were also the main species, with the highest prevalence rates and infection intensities, in sheep from other Brazilian States, such as Santa Catarina (RAMOS et al, 2004) and São Paulo (WILMSEN et al, 2014). In other important sheep-producing areas of South America, such as Uruguay, H. contortus is also the most important parasite in almost all seasons except winter, when T. colubriformis, and to a lesser extent, T. axei, T. circumcincta and Cooperia spp.…”

Section: Discussionmentioning

confidence: 97%

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Helminth infections and hybridization between Haemonchus contortus and Haemonchus placei in sheep from Santana do Livramento, Brazil

Almeida

Bassetto

Amarante

et al. 2018

Rev. Bras. Parasitol. Vet.

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The occurrence and intensity of helminth infections were evaluated in sheep from pastures shared with cattle. In 2015 and 2016, young male sheep acquired in Santana do Livramento, Rio Grande do Sul, Brazil, were finished in integrated crop-livestock system. We selected the 12 sheep that showed the highest number of nematode eggs per gram of faeces to search for worms in the gastrointestinal tract. Haemonchus contortus and Trichostrongylus colubriformis were the major parasites. H. contortus presented mean intensities of 1,159 and 257 worms in 2015 and 2016, respectively. T. colubriformis displayed mean intensities of 4,149 and 2,427 worms in 2015 and 2016, respectively. Of the 127 male specimens of Haemonchus spp. analysed by Polymerase Chain Reaction (PCR), 125 were H. contortus, one Haemonchus placei and one hybrid. Other species detected were Cooperia punctata , Cooperia pectinata, Cooperia spatulata, Cooperia curticei, Ostertagia ostertagi, Teladorsagia circumcincta , Trichostrongylus axei, Nematodirus spathiger , and Trichuris ovis. Twenty lambs presented cysts of Taenia hydatigena in the liver and mesentery. One lamb presented Coenurus cerebralis, the larval stage of Taenia multiceps, in the brain. In conclusion, sheep from pasture shared with cattle presented a high diversity of nematode species. H. contortus and H. placei co-infection occur with consequent hybridization.

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Gastrointestinal nematode infections in sheep raised in Botucatu, state of São Paulo, Brazil

Cited by 27 publications

References 17 publications

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Infection with gastrointestinal nematodes in lambs in different integrated crop-livestock systems (ICL)

Determinação de valores de referência séricos para os eletrólitos magnésio, cloretos, cálcio e fósforo em ovinos das raças Dorper e Santa Inês

Helminth infections and hybridization between Haemonchus contortus and Haemonchus placei in sheep from Santana do Livramento, Brazil

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