Resistance of Santa Ines and crossbred ewes to naturally acquired gastrointestinal nematode infections

Amarante, Alessandro Francisco Talamini do; Susin, Ivanete; Rocha, Rosilene Fernandes da; Silva, M. B.; Mendes, Clayton Quirino; Pires, Alexandre Vaz

doi:10.1016/j.vetpar.2009.07.009

Cited by 72 publications

(58 citation statements)

References 24 publications

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“…The development of multi-drug resistance by H. contortus parasites has driven research into alternative control measures, including selection of sheep genetically resistant to GIN infection. Genetically resistant sheep (either through breeding selection, or use of local indigenous breeds) are increasingly considered as viable alternatives to increase animal production (Amarante et al, 2009) and to learn novel mechanisms of resistance not described in commercial breeds . Importantly, GIN parasites may not adapt to these resistance mechanisms in such selected sheep (Kemper et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Fecundity in adult Haemonchus contortus parasites is correlated with abomasal tissue eosinophils and γδ T cells in resistant Canaria Hair Breed sheep

González

Hernández

Meeusen

et al. 2011

Veterinary Parasitology

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Section: Introductionmentioning

confidence: 99%

Fecundity in adult Haemonchus contortus parasites is correlated with abomasal tissue eosinophils and γδ T cells in resistant Canaria Hair Breed sheep

González

Hernández

Meeusen

et al. 2011

Veterinary Parasitology

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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: 44%

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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“…The color of the breed also changed and is now predominantly brown or black whereas before various coat colors could be found (31). The risk associated with this “unknown” crossbreeding are the loss of important traits such as gastro-intestinal parasite resistance (43), pelt quality (10), heat resistance (44), and also the insertion of non-desirable traits such as scrapie susceptibility (38), as explained earlier for Brazilian Somali.…”

Section: Discussionmentioning

confidence: 99%

How to better conserve with genetic data: origin and population structure of Brazilian locally adapted hair sheep (Ovis aries) breeds

Paim¹,

Paiva

Toledo

et al. 2019

Preprint

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31Brazilian hair sheep constitute a genetic diversity hotspot of sheep breeds. These locally 32 adapted genetic resources developed in harsh environments of the Brazilian Northwest 33 (semi-arid) and maintained important traits for this region, such as parasite resistance, 34 heat tolerance and high pelt quality. Genotypes (50K SNP chip) from seven Brazilian 35 sheep breeds (5 hair and 2 coarse wool types) and 87 worldwide breeds were used to 36 verify population structure, admixture and genetic diversity, using PCA and 37 ADMIXTURE analyses. We constructed a phylogenetic tree and evaluated migration 38 events between genetic groups using TREEMIX software. Brazilian Somali, a fat-tailed 39 breed, was the unique breed with high relationship with East African breeds and formed 40 a distinct cluster from other Brazilian breeds. This breed seems to contribute to formation 41 of Santa Inês, Morada Nova and Brazilian Fat-tail breeds. Brazilian Blackbelly had a clear 42 relationship with Barbados Blackbelly, which appeared as another group. Other Brazilian 43 breeds seem to form a further genetic group with some recent admixtures. Morada Nova 44 remained as a separate group, not showing a strong relationship with European or African 45 breeds, only revealing a migration event from Sidaoun, an Algerian hair breed. Brazilian 46 Fat-tail and Morada Nova share a common ancestor, but the first received introgressions 47 from Brazilian Somali and Afrikaner breeds, explaining the fat-tail phenotype. Santa Inês 48 received strong contribution from Bergamasca and had an admixed origin with recent 49 introgressions from other breeds, mainly from Suffolk animals. In conclusion, Brazilian 50 Somali and Brazilian Fat-tail are the most endangered sheep genetic resources in Brazil.51 52 53 Cattle, sheep, goats and pigs were domesticated in the region from Central 54

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Resistance of Santa Ines and crossbred ewes to naturally acquired gastrointestinal nematode infections

Cited by 72 publications

References 24 publications

Fecundity in adult Haemonchus contortus parasites is correlated with abomasal tissue eosinophils and γδ T cells in resistant Canaria Hair Breed sheep

Fecundity in adult Haemonchus contortus parasites is correlated with abomasal tissue eosinophils and γδ T cells in resistant Canaria Hair Breed sheep

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

How to better conserve with genetic data: origin and population structure of Brazilian locally adapted hair sheep (Ovis aries) breeds

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