Veterinary Record. 1988. 123: 9, 230-231.

Mitchell, G. B. B. Mathieson, A. O. Fitzsimons, J.

Epidemiology of Nematodirus battus infection in eastern Scotland.

Research in Veterinary Science. 1985. 38: 2, 197-201.

Coop, R. L. Jackson, F. Jackson, E. Fitzsimons, J. Lowman, B. G.

Nematodirus infection in lambs on an alternate grazing system of husbandry.

Research in Veterinary Science. 1988. 45: 1, 62-67.

Coop, R. L. Smith, W. D. Angus, K. W. Graham, R. B. Wright, S. E. Jackson, F.

Effect of Ostertagia ostertagi on lamb performance and cross resistance to O.circumcincta.

Research in Veterinary Science. 1985. 39: 2, 200-206.

Bairden, K. Armour, J. Duncan, J. L.

A 4-year study on the effectiveness of alternate grazing of cattle and sheep in the control of bovine parasitic gastro-enteritis.

Veterinary Parasitology. 1995. 60: 1/2, 119-132.

Coop, R. L. Jackson, F. Jackson, E.

Relative contribution of cattle to contamination of pasture with Nematodirus battus under an alternate grazing system of husbandry.

Research in Veterinary Science. 1991. 50: 2, 211-215.

Niezen, J. H. Charleston, W. A. G. Hodgson, J. Mackay, A. D. Leathwick, D. M.

Controlling internal parasites in grazing ruminants without recourse to anthelmintics: approaches, experiences and prospects.

International Journal for Parasitology. 1996. 26: 8/9, 983-992.

Fernandez, A. S. Larsen, M. Henningsen, E. Nansen, P. Gronvold, J. Bjorn, H. Wolstrup, J.

Effect of Duddingtonia flagrans against Ostertagia ostertagi in cattle grazing at different stocking rates.

Parasitology. 1999a. 119: 1, 105-111.

Orpin, P. G.

Ostertagiasis in suckler cows.

Veterinary Record. 1994. 135: 24, 584.

Anderson, N.

Aspects of the biology of Ostertagia ostertagi in relation to the genesis of ostertagiasis.

Veterinary Parasitology. 1988. 27: 1, 13-21.

Nansen, P. Jorgensen, R. J. Henriksen, S. A. Foldager, J.

The effects of late turnout on the epidemiology and control of ostertagiasis in calves.

Veterinary Parasitology. 1987. 24: 1-2, 139-147.

McKellar, Q. Duncan, J. L. Armour, J. McWilliam, P.

Response to transplanted adult Ostertagia ostertagi in calves.

Research in Veterinary Science. 1986. 40: 3, 367-371.

Entrocasso, C. McKellar, Q. Parkins, J. J. Bairden, K. Armour, J. Kloosterman, A.

The sequential development of Type I and Type II ostertagiasis in young cattle with special reference to biochemical and serological changes.

Veterinary Parasitology. 1986. 21: 3, 173-188.

SVS (1982)

Effect of the drought of 1976 on the health of cattle, sheep and other farm livestock in England and Wales.

Veterinary Record. 1982. 111: 18, 407-411.

Gronvold, J. Wolstrup, J. Nansen, P. Larsen, M. Henriksen, S. A. Bjorn, H. Kirchheiner, K. Lassen, K. Rawat, H. Kristiansen, H. L.

Biotic and abiotic factors influencing growth rate and production of traps by the nematode-trapping fungus Duddingtonia flagrans when induced by Cooperia oncophora larvae.

Journal of Helminthology. 1999. 73: 2, 129-136.

Fernandez, A. S. Larsen, M. Nansen, P. Henningsen, E. Gronvold, J. Wolstrup, J. Henriksen, S. A. Bjorn, H.

The ability of the nematode-trapping fungus Duddingtonia flagrans to reduce the transmission of infective Ostertagia ostertagi larvae from faeces to herbage.

Journal of Helminthology. 1999b. 73: 2, 115-122.

Stear, M. J. Bishop, S. C.

Breeding for resistance to nematode infection in cattle.

Cattle Practice. 1999. 7: 2, 189-191.

Coles, G. C. Stafford, K. A.

Anthelmintic resistance in cattle nematodes in the UK.

Cattle Practice. 1999. 7: 2, 173-175.

Forbes, A. B. Huckle, C. A. Gibb, M. J. Rook, A. J.

The effect of gastrointestinal parasitism on grazing behaviour, herbage intake and performance in calves.

Cattle Practice. 1999. 7: 2, 169-172. 11 ref.

Eysker, M. Aar, W. M. van der. Boersema, J. H. Githiori, J. B. Kooyman, F. N. J.

The effect of repeated moves to clean pasture on the build up of gastrointestinal nematode infections in calves.

Veterinary Parasitology. 1998a. 76: 1/2, 81-94.

Shaw, D. J. Vercruysse, J. Claerebout, E. Dorny, P.

Gastrointestinal nematode infections of first-grazing season calves in Western Europe: associations between parasitological, physiological and physical factors.

Veterinary Parasitology. 1998. 75: 2/3, 133-151.

Eysker, M. Aar, W. M. van der. Boersema, J. H. Dop, P. Y. Kooyman, F. N. J.

The efficacy of Michel's dose and move system on gastrointestinal nematode infections in dairy calves.

Veterinary Parasitology. 1998b. 75: 2/3, 99-114.

Vaarst, M. Ploeger, H. W. Thamsborg, S. M. Sorensen, J. T.

Organic dairy farming and nematode parasitism: infection patterns among replacement heifers not preventively treated with anthelmintics.

Livestock farming systems: research, development socio-economics and land management. Proceedings of the Third International Symposium Aberdeen, Scotland, 1-2 September, 1994. Wageningen Pers, Wageningen, Netherlands: 1996. 85-90.

Poot, J. Eysker, M. Lam, T. J. G. M.

Variation in infection levels with gastrointestinal nematodes in first-year grazing calves in the Netherlands.

Veterinary Parasitology. 1997. 68: 1/2, 103-111.

Mitchell, L.

Clean grazing for parasite control.

New Farmer & Grower. 1996. No. 52, 8-10.

Niezen, J. H. Charleston, W. A. G. Hodgson, J. Miller, C. M. Waghorn, T. S. Robertson, H.

Effect of plant species on the larvae of gastrointestinal nematodes which parasitise sheep.

International Journal for Parasitology 28: 5 (1998), 791-803.

Taylor, S. M. Andrews, A. H.

Endoparasites and Ectoparasites.

Bovine Medicine, Blackwell Scientific Publications, pp. 231-252. 1992.

UKROFS (2000):

UKROFS Standards for Organic Food Production.

UK Register of Organic Food Standards.

Room 320C C/O MAFF, Nobel House, 17 Smith Square, London SW1P 3JR.

Standards

EU (1999)

Council Regulation (EC) No 1804/1999 of July 1999 supplementing Regulation (EEC) No 2092/91 on organic production of agricultural products and indications referring thereto on agricultural products and foodstuffs to include livestock production.