Breeding sheep in New Zealand that are less reliant on anthelmintics to maintain health and productivity

References

• Adams , DB . 1988 . Infection with Haemonchus contortus in sheep and the role of adaptive immunity in selection for the parasite . International Journal for Parasitology , 18 : 1071 – 1075 .
   PubMed Web of Science ®Google Scholar
• Albers , GAA and Burgess , SE . 1988 . Serial passage of Haemonchus contortusin resistant and susceptible sheep . Veterinary Parasitology , 28 : 303 – 306 .
   PubMed Web of Science ®Google Scholar
• Albers , GAA , Burgess , SE , Adams , DB , Barker , JSF , Le Jambre , LF and Piper , LR . 1984 . “ Breeding Haemonchus contortus resistant sheep — problems and prospects ” . In Immunogenetic Approaches to the Control of Endoparasites Edited by: Dineen , JK and Outteridge , PM . 41 – 51 . Melbourne : CSIRO, Division of Animal Health, .
   Google Scholar
• Albers , GAA , Gray , GD , Piper , LR , Barker , JSF , Le Jambre , LF and Barger , IA . 1987 . The genetics of resistance and resilience to Haemonchus contortus infection in young Merino sheep . International Journal for Parasitology , 17 : 1355 – 1363 .
   PubMed Web of Science ®Google Scholar
• Amer , PR . 2000 . Trait economic weightsfor genetic improvement with SIL . Proceeding of the New Zealand Society of Animal Production , 60 : 189 – 191 .
   Google Scholar
• Amer , PR , Woolaston , RR , Eady , SJ and McEwan , JC . 1999 . Economic values for sheep internal parasite resistance traits in New Zealand and Australia . Proceedingsof the Association for the Advancement of Animal Breeding and Genetics , 13 : 504 – 507 .
   Google Scholar
• Baker , RL , Watson , TG , Bisset , SA , Vlassoff , A and Douch , PGC . 1991 . “ Breeding sheep in New Zealand for resistance to internal parasites: research results and commercial application ” . In Breeding for Disease Resistance in Sheep Edited by: Gray , GD and Woolaston , RR . 19 – 32 . Melbourne : Australian Wool Corporation, .
   Google Scholar
• Barnes , EH , Dobson , RJ and Barger , IA . 1995 . Worm control and anthelmintic resistance: adventures with amodel . Parasitology Today , 11 : 56 – 63 .
   PubMedGoogle Scholar
• Bishop , SC , Bairden , K , McKellar , QA , Park , M and Stear , MJ . 1996 . Genetic parameters for faecal egg count following mixed, natural, predominantly Ostertagia circumcincta infection and relationships with live weight in young lambs . Animal Science , 63 : 423 – 428 .
   Google Scholar
• Bisset , SA and Morris , CA . 1996 . Feasibility and implications of breeding sheep for resilience to nematode challenge . International Journal for Parasitology , 26 : 857 – 868 .
   PubMed Web of Science ®Google Scholar
• Bisset , SA , Vlassoff , A and West , CJ . “ Breeding sheep for resistance/tolerance to internal parasites ” . In Practical Aspects of Internal Parasite Control 83 – 91 .
   Google Scholar
• 1991 . New Zealand Journal of Agricultural Research ,
   Google Scholar
• Bisset , SA , Vlassoff , A , Morris , CA , Southey , BR , Baker , RL and Parker , AGH . 1992 . Heritability of and genetic correlations among faecal egg counts and productivity traits in Romney sheep . New Zealand Journal of Agricultural Research , 35 : 51 – 58 .
   Web of Science ®Google Scholar
• Bisset , SA , Morris , CA , Squire , DR , Hickey , SM and Wheeler , M . 1994 . Genetics of resilience to nematode parasites in Romney sheep . New Zealand Journal of Agricultural Research , 37 : 521 – 524 .
   Web of Science ®Google Scholar
• Bisset , SA , Morris , CA , Squire , D R and Hickey , SM . 1996a . Genetics of resilience to nematode parasites in young Romney sheep — selective drenching using weight gain under challenge to assess drench requirements . New Zealand Journal of Agricultural Research , 39 : 313 – 323 .
   Web of Science ®Google Scholar
• Bisset , SA , Vlassoff , A , Douch , PGC , Jonas , WE , West , CJ and Green , RS . 1996b . Nematode burdens and immunological responses in Romney lambs selectively bred for low or high faecal worm egg counts . Veterinary Parasitology , 61 : 249 – 263 .
   PubMed Web of Science ®Google Scholar
• Bisset , SA , Vlassoff , A and West , CJ . 1997 . Epidemiology of nematodosis in lambs selectively bred for genetic resistance or susceptibility to nematode infection . Veterinary Parasitology , 70 : 255 – 269 .
   PubMed Web of Science ®Google Scholar
• Bisset , SA , van Wyk , JA , Bath , GF , Morris , CA , Stenson , MO and Malan , FS . 2001 . Phenotypic and genetic relationships amongst FAMACHA score, faecal egg count and performance data in Merino sheep exposed to Haemonchus contortus infection in South Africa Capetown : Proceedings of the 5th International Sheep Veterinary Congress, .
   Google Scholar
• Buddle , BM , Jowett , G , Green , RS , Douch , PGC and Risdon , PL . 1992 . Association of blood eosinophilia with expression of resistance in Romney lambs to nematodes . International Journal for Parasitology , 22 : 955 – 960 .
   PubMed Web of Science ®Google Scholar
• Campbell , AG . 1986 . Selection strategies for animal disease resistance . New Zealand Agricultural Science , 20 : 169 – 171 .
   Google Scholar
• Clunies-Ross , L . 1932 . Observations on the resistance of sheep to infestation by the stomach worm Haemonchus contortus . Journal of the Council for Scientific and Industrial Research , 5 : 73 – 80 .
   Google Scholar
• Courtney , CH , Parker , CF , McClure , KE and Herd , RP . 1985 . Resistance of exotic and domestic lambs to experimental infection with Haemonchus contortus . International Journal for Parasitology , 15 : 101 – 109 .
   PubMed Web of Science ®Google Scholar
• Crawford , AM . 2001 . A review of QTL experiments in sheep . Proceedings of the Association for the Advancement of Animal Breeding and Genetics , 14 : 33 – 38 .
   Google Scholar
• Crawford , AM and McEwan , JC . 1999 . Identification of animals resistant to nematode parasite infection Patent application 330201 , 45 – 45 . New Zealand : New Zealand Pastoral Agriculture Research Institute Limited .
   Google Scholar
• Douch , PGC , Green , RS , Morris , CA , Bisset , SA , Vlassoff , A , Baker , RL , Watson , TG , Hurford , AP and Wheeler , M . 1995 . Genetic and phenotypic relationships among anti-Trichostrongylus colubriformis antibody level, faecal egg count and body weight traits in grazing Romney sheep . Livestock Production Science , 41 : 121 – 132 .
   Google Scholar
• Finkelman , FD , Shea-Donohue , T , Goldhill , J , Sullivan , CA , Morris , SC , Madden , KB , Gause , WC and Urban , JF . 1997 . Cytokine regulation of host defence against parasitic gastro-intestinal nematodes: lessons from studies with rodent models . Annual Review of Immunology , 15 : 505 – 533 .
   PubMed Web of Science ®Google Scholar
• Galloway , SM , Cambridge , LM , Henry , HM , van Stijn , TC and Davis , GH . 1999 . Agenetic test to identify carriers of the ovine Inverdale fecundity gene . Proceedings of the New Zealand Society of Animal Production , 59 : 114 – 116 .
   Google Scholar
• Garrick , DJ , Blair , HT and Bisset , SA . 1992 . Selection of Romney sheep grazing nematode infested pasture . Proceedings of the Australian Association of Animal Breeding and Genetics , 10 : 448 – 451 .
   Google Scholar
• Greeff , JC and Karlsson , LJE . 1999 . Will selection for decreased faecal worm egg count result in an increase in scouring . Proceedings of the Association for the Advancement of Animal Breeding and Genetics , 13 : 508 – 511 .
   Google Scholar
• Howse , SW , Blair , HT , Garrick , DJ and Pomroy , WE . 1992 . A comparison of internal parasitism in fleeceweight-selected and control Romney sheep . Proceedingsof the New Zealand Society of Animal Production , 52 : 51 – 58 .
   Google Scholar
• Jopson , NB , Dodds , KG , Knowler , KJ , Wheeler , R and McEwan , JC . 2000 . Lamb and ewe performance of East Friesian x Coopworthsrelative to pure-bred Coopworths . Proceedings of the New Zealand Society of Animal Production , 60 : 47 – 50 .
   Google Scholar
• Jopson , NB , Nicoll , GB , Stevenson-Barry , JM , Duncan , S , Greer , GJ , Bain , WE , Gerard , EM , Glass , BC , Broad , TE and McEwan , JC . 2001 . Mode of inheritance and effects on meat quality of the rib-eye muscling (REM) QTL in sheep . Proceedings of the Association for the Advancement of Animal Breeding and Genetics , 14 : 111 – 114 .
   Google Scholar
• Larsen , JWA , Anderson , N , Vizard , AL , Anderson , GA and Hoste , H . 1994 . Diarrhoea in Merino ewes during winter: association with trichostrongylid larvae . Australian Veterinary Journal , 71 : 365 – 372 .
   PubMed Web of Science ®Google Scholar
• Larsen , JWA , Vizard , AL and Anderson , N . 1995 . Role of larval nematode infection in lamb diarrhoea . Veterinary Record , 137 : 572 – 572 .
   PubMed Web of Science ®Google Scholar
• Litherland , AJ , Sorenson , E , Niezen , J and Bishop , D . 1992 . Apilot evaluation of shedding sheep breeds compared with non-shedding breeds for susceptibility to nematodes and flystrike . Proceedings of the New Zealand Society of Animal Production , 52 : 233 – 235 .
   Google Scholar
• McEwan , JC . 1994 . Breeders manual, New Zealand WormFEC^TM Service Invermay : New Zealand Pastoral Agriculture Research Institute Limited, .
   Google Scholar
• McEwan , JC and Amer , PA . 2001 . Economic value of host resistance to nematodes in NZ sheep (abstract) . New Zealand Journal of Zoology , 28 : 232 – 233 .
   Google Scholar
• McEwan , JC , Mason , P , Baker , RL , Clarke , JN , Hickey , SM and Turner , K . 1992 . Effect of selection for productive traits on internal parasite resistance in sheep . Proceedings of the New Zealand Society of Animal Production , 52 : 53 – 56 .
   Google Scholar
• McEwan , JC , Greer , GJ , Bain , WE , Dodds , KG , Davis , GH , Reid , P , Douch , PGC and Green , R . 1994a . High prolificacy Romney, Perendale and Coopworth breeds differ in parasite resistance (abstract) . New Zealand Journal of Zoology , 21 : 103 – 104 .
   Google Scholar
• McEwan , JC , Greer , GJ , Bain , WE , Dodds , KG , Campbell , RJW , Douch , PGC and Green , R . 1994b . Romney and Texel cross Romney lambs differ in parasite resistance (abstract) . New Zealand Journal of Zoology , 21 : 104 – 105 .
   Google Scholar
• McEwan , JC , Dodds , KG , GreerGJ, , Bain WE , Duncan , SJ , Wheeler , R , Knowler , KJ , Reid , PJ , Green , RS and Douch , PGC . 1995 . Genetic estimates for parasite resistance traits in sheep and their correlations with production traits (abstract) . New Zealand Journal of Zoology , 22 : 177 – 177 .
   Google Scholar
• McEwan , JC , Bisset, , SA and Morris , CA . 1997a . “ The selection of sheep for natural resistance to internal parasites ” . In Sustainable Control of Internal Parasites in Ruminants-an Animal Industries Workshop Edited by: Barrell , GK . 161 – 182 . Lincoln : Lincoln University, .
   Google Scholar
• McEwan , JC , Dodds , KG , Greer , GJ , Bain , WE , Wright , CS , Green , RS and Watson , TG . 1997b . Genotype rankings for host resistance to internal parasites for sheep grazed in contrasting environments . Proceedings of the Association for the Advancement of Animal Breeding and Genetics , 12 : 40 – 44 .
   Google Scholar
• McSporran , KD and Andrewes , WGK . 1988 . Parasites and hormones in autumn lambing sheep . Proceedings of the 18th Seminar of the Society of Sheep and Beef Cattle Veterinarians of the New Zealand Veterinary Association , : 150 – 159 .
   Google Scholar
• Morris , CA , Bisset , SA , Baker , RL , Watson , TG , Johnson , DL and Wheeler , M . 1993a . An investigation of sire by location interactions for faecal nematode egg counts in lambs . Proceedings of the New Zealand Society of Animal Production , 53 : 231 – 233 .
   Google Scholar
• Morris , CA , Watson , TG , Baker , RL , Hurford , AP and Hosking , BC . 1993b . Repeatability estimates and selection flock effectsfor faecal nematode egg counts in Romney breeding ewes . Proceedings of the New Zealand Society of Animal Production , 53 : 227 – 229 .
   Google Scholar
• Morris , CA , Watson , TG , Bisset , SA , Vlassoff , A and Douch , PGC . 1995 . “ Breeding sheep in NewZealandfor resistance or resilienceto nematode parasites ” . In Breeding for Resistance to Infectious Diseases of Small Ruminants Edited by: Gray , GD , Woolaston , RR and Eaton , B . 77 – 98 . Canberra : Australian Centre for International Agricultural Research, .
   Google Scholar
• Morris , CA , Bisset , SA , Vlassoff , A , Baker , RL , Watson , TG , Leathwick , DM and Wheeler , M . 1997 . Correlated responses in fleeceweight to selection for divergence in faecal nematode egg count in New Zealand Romneys and Perendales . Proceedings of the New Zealand Society of Animal Production , 57 : 26 – 28 .
   Google Scholar
• Morris , CA , Bisset , SA , Vlassoff , A , West , CJ and Wheeler , M . 1998 . Faecal nematode egg counts in lactating ewes from Romney flocks selectively bred for divergence in lamb faecal egg count . Animal Science , 67 : 283 – 283 .
   Google Scholar
• Morris , CA , Vlassoff , A , Bisset , SA , Baker , RL , Watson , TG , West , CJ and Wheeler , M . 2000 . Continued selection of Romney sheep for resistance or susceptibility to nematode infection: estimates of direct and correlated responses . Animal Science , 70 : 17 – 27 .
   Google Scholar
• Morris , CA , Bisset , SA , Vlassoff , A , MacKay , AD , Betteridge , K , Alderton , MJ , West , CJ and Devantier , BP . 2001 . Genetic studies of resilience of Romney sheep to nematode challenge in New Zealand . Proceedings of the New Zealand Society of Animal Production , 61 : 92 – 95 .
   Google Scholar
• Newman , SA , Dodds , KG , Clarke , JN , Garrick , DJ and McEwan , JC . 2000 . The Sheep Improvement Limited (SIL) genetic engine . Proceedings of the New Zealand Society of Animal Production , 60 : 195 – 197 .
   Google Scholar
• Preston , JM and Allonby , EW . 1979 . The influence of breed on the susceptibility of sheep to Haemonchus contortus infection . Research in Veterinary Science , 26 : 134 – 9 .
   PubMed Web of Science ®Google Scholar
• Riffkin , GC and Dobson , C . 1979 . Predicting resistance of sheep to Haemonchus contortus infections . Veterinary Parasitology , 5 : 365 – 78 .
   Web of Science ®Google Scholar
• Shaw , RJ , Morris , CA , Green , RS , Wheeler , M , Bisset , SA , Vlassoff , A and Douch , PGC . 1999 . Genetic and phenotypic relationships among Trichostrongylus colubriformis-specific immunoglobulin E, anti-Trichostrongylus colubriformis antibody, immunoglobulin G1, faecal egg count and body weight traits in grazing Romney lambs . Livestock Production Science , 58 : 25 – 32 .
   Google Scholar
• Stewart , MA , Miller , RF and Douglas , JR . 1937 . Resistance of sheep of different breeds to infestations by Ostertagia circumcincta . Journal of Agricultural Research , 55 : 923 – 30 .
   Google Scholar
• Vlassoff , A . 1973 . Seasonal incidence of infective trichostrongyle larvae on pastures grazed by lambs . New Zealand Journal of Experimental Agriculture , 1 : 293 – 301 .
   Google Scholar
• Watson , TG , Baker , RL and Harvey , TG . 1986 . Genetic variation in resistance or tolerance to internal nematode parasites in strains of sheep at Rotomahana . Proceedings of the New Zealand Society of Animal Production , 46 : 23 – 6 .
   Google Scholar
• Watson , TG , Hosking , BC and Hurford , AP . 1992 . Breed variation in expression of faecal nematode egg count . Proceedings of the New Zealand Society of Animal Production , 52 : 69 – 71 .
   Google Scholar
• Watson , TG , Hosking , BC , Morris , CA and Hurford , AP . 1995 . Faecal nematode egg counts and haematology in Perendale ewes near lambing . Proceedings of the New Zealand Society of Animal Production , 55 : 202 – 4 .
   Google Scholar
• Williamson , JF , Blair , HT , Garrick , DJ , Pomroy , WE , Douch , PGC , Green , RS and Simpson , HV . 1995 . Parasitism and production in fleece-weight-selected and control sheep . New Zealand Journal of Agricultural Research , 38 : 381 – 7 .
   Web of Science ®Google Scholar
• Windon , RG . 1991 . “ Resistance mechanisms in the Trichostrongylus selection flock ” . In Breeding for Disease Resistance in Sheep Edited by: Gray , GD and Woolaston , RR . 77 – 86 . Melbourne : Australian Wool Corporation, .
   Google Scholar
• Whitlock , JH . 1958 . The inheritance of resistance to trichostrongylidosis in sheep. I. Demonstration of the validity of the phenomena . The Cornell Veterinarian , 48 : 127 – 33 .
   PubMedGoogle Scholar
• Woolaston , RR and Baker , RL . 1996 . Prospects of breeding small ruminants for resistance to internal parasites . International Journal for Parasitology , 26 : 845 – 55 .
   PubMed Web of Science ®Google Scholar
• Woolaston , RR and Ward , JL . 1999 . Including dag score in Merino breeding programmes . Proceedings of the Association for the Advancement of Animal Breeding and Genetics , 13 : 512 – 5 .
   Google Scholar
• Woolaston , RR , Elwin , RL and Barger , IA . 1992 . No adaptation of Haemonchus contortus to genetically resistant sheep . International Journal for Parasitology , 22 : 377 – 80 .
   PubMed Web of Science ®Google Scholar
• Yuzbasiyan-Gurkan , V , Krehbiel , JD , Cao , Y and Venta , PJ . 1999 . Development and usefulness of new polymerase chain reaction-based tests for detection of different alleles at codons 136 and 171 of the ovine prion protein gene . American Journal of Veterinary Research , 60 : 884 – 7 .
   PubMed Web of Science ®Google Scholar