Table 1: Comparative studies of susceptibility/resistance to Haemonchus contortus or gastrointestinal nematodes between sheep breeds.

Resistant breed Susceptible breedParasiteInfectionEvaluated parametersReferences

Florida Native Saint Croix and crossbred Dorset × RambouilletH. contortus AIPar, Hem, Immunol, Hist[29]
Saint CroixDorperH. contortus NIPar, Bioch, Immunol, Hist[30]
Florida Native Suffolk and RambouilletH. contortus NI y AIPar, Hem, Bioch, Immunol[31, 32]
Red MaasaiBlackheaded Somali, Dorper and Romney MarshGINsNIPar, Hem[1]
CastellanaNilH. contortus AIPar, Immunol[33]
Florida Native and PelibueyGINsNIPar, Hem, LW[34]
RhönNilTrichostrongylus spp. NI Par, Hem, Bioch[35]
German MerinoRhönH. contortus AIPar, Hem, Immunol[36]
SabiDorperGINsNIPar, Hem, LW[37]
BlackbellyINRA 401H. contortus and Trichostrongylus colubriformis AIPar[38]
Crossbred Saint Croix × BlackbellyCrossbred
Dorset (50%), GINsAI y NIPar[6]
Rambouillet (25%)
Finnsheep (25%)
Katahdin and crossbred Blackbelly × Saint CroixDorper and DorsetH. contortus AIPar, Hem, LW[39]
Gulf Coast Native SuffolkGINsNIPar, Hem[40]
Saint CroixKatahdin and DorperGINsNI y AIPar, Hem, LW[41]
Saint CroixKatahdin and SuffolkGINsNIPar, Hem, LW[42]
Crioula Lanada of BrasilCorriedaleH. contortus NITPar, Bioch, Hem, Hist[11]
Red MaasaiDorperH. contortus AIPar, Hem, LW, MP [43]
Santa InesIle de FranceH. contortus AIPar, Hem, Bioch, Hist, Immunol, LW[44]
Santa InesSuffolk and Ile de FranceGINsNIPar, Hem, Hist, Immunol[45]
TexelSuffolkGINsNIPar, Hist[46]
BlackbellyColumbiaH. contortus AIPar, Hem, Hist, Immunol[47]
BlackbellyINRA 401H. contortus AIPar, Hist, Immunol[48]
LohiThalli and KachhiH. contortus AI y NIPar, Hem, Bioch, Hist, LW[49]
Criolla Native to the Central Mexican PlateauSuffolkH. contortus AIPar, Hem, FT, LW[14]
Gulf Coast NativeSuffolkH. contortus AIPar, Immunol[50]
Santa InesIle de FranceH. contortus AIPar. Immunol[51]
Canaria HairCanariaH. contortus AIPar.[52]

NI: natural infection; AI: artificial infection; GINs: gastrointestinal nematodes; Par: parasitological (fecal eggs count, worm burden, etc.); Hem: hematological (packed cell volume, blood eosinophils, etc.); Immunol: immunological (antibodies); Hist: cellular count in abomasum (eosinophils, leucocytes, mast cells, etc.); Bioch: biochemical (serum protein, albumin, etc); LW: live weight; MP: mortality percentage FT: FAMACHA test.