Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-13T00:40:54.515Z Has data issue: false hasContentIssue false
  • English
  • Français

Studies on the Worm Populations in the Alimentary Tract of Breeding Ewes

Published online by Cambridge University Press:  05 June 2009

R. M. Connan
R. M. Connan
Affiliation:
Department of Animal Pathology University of Cambridge, Madingley Road, Cambridge
Get access Rights & Permissions [Opens in a new window]

Extract

Groups of breeding ewes were slaughtered at intervals before and after lambing in March. A post-parturient rise in egg count was observed in which Ostertagia spp. were dominant but in which other species took part, in particular Haemonchus contortus, Nematodirus battus and Chabertia ovina. The important contribution made by dormant larvae of Ostertagia spp. was confirmed but it was also found that reinfection greatly increased the number of worms present while the earliest part of the rise, often beginning prior to parturition, was probably due to the increased fecundity of adult worms already present. Adults of H. contortus present in ewes after lambing were derived from the maturation of dormant larvae and it is probable that the same applied to C. ovina. The close association of the postparturient rise with lactation rather than with pregnancy or parturition was shown and two possible explanations for this were discussed.

Type
Research Article
Information
Journal of Helminthology , Volume 42 , Issue 1-2 , August 1968 , pp. 9 - 28
Copyright
Copyright © Cambridge University Press 1968

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anderson, N., Armour, J., Jennings, F. W., Ritchie, J. D. and Urquhart, G. M., 1905.—“Inhibited development of Ostertagia ostertagi”. Vet. Rec., 77, 140–147.Google Scholar
Armour, J., Jennings, F. W. and Urquhart, G. M., 1907.—“The possible existence of two strains of Ostertagia ostertagi”. Vet. Rec., 80, 208–209.Google Scholar
British oil and Cake Mills, Ltd., 1954–1905.—Reports of sow and gilt performance test.Google Scholar
Brunsdon, R. V., 1902.—“Age resistance of sheep to infestation with the nematodes, Nematodirus filicollis and Nematodirus spathiger”. N.Z. Vet J., 10, 1–6.CrossRefGoogle Scholar
Clunies Ross, I. and Gordon, H. MCL., 1933.—“Nutritional factors affecting resistance to Haeraonchosis”. J. Aust. vet. Ass., 9, 100–107.CrossRefGoogle Scholar
Connan, R. M., 1967a.—“Observations on the epidemiology of parasitic gastroenteritis due to Oesophagostomum spp. and Hyostrongylns rubidus in the pig”. Vet. Rec., 80, 424–429.CrossRefGoogle ScholarPubMed
Connan, R. M., 1967b.—“Observations on the post-parturient rise in the faecal ncmatode egg count of ewes”. Vet. Rec., 80, 410–405.CrossRefGoogle ScholarPubMed
Crofton, H. D., 1954.—“Nematode parasite populations in sheep on lowland farms. I. Worm egg counts in ewes”. Parasitology, 44, 465–477.CrossRefGoogle ScholarPubMed
Crofton, H. D., 1958.—“Nematode parasite populations in sheep on lowland farms. V. Further observations on the post-parturient rise and a discussion of its significance”. Parasitology, 48, 243–250.CrossRefGoogle Scholar
Dunsmore, J. D., 1905.—“Ostertagia spp. in lambs and pregnant ewes. J. Helminth., 39, 159–184.CrossRefGoogle Scholar
Dunsmore, J. D., 1966a.—“Nematode parasites of free-living rabbits, Oryctolagus cuniculus (L), in Eastern Australia. I. Variations in the numbers of Trichostrongylus retortaeformis (Zeder)”. Aust. J. Zool., 14, 185–199.CrossRefGoogle Scholar
Dunsmore, J. D., 1966b.—“Nematode parasites of free-living rabbits, Oryctolagus cuniculus (L), in Eastern Australia. II. Variations in the numbers of Graphidium strigosutn (Dujardin) Railliet and Henry”. Aust. J. Zool., 14, 625–634.CrossRefGoogle Scholar
Dunsmore, J. D., 1966c.—“Nematode parasites of free-living rabbits, Oryctolagus cunicuhts (L), in Eastern Australia. III. Variations in the numbers of Passalurus ambiguus (Rudolphi)”. Aust. J. Zool., 14, 635–645.CrossRefGoogle Scholar
Dunsmore, J. D., 1966d.—“Influence of host reproduction on numbers of Trichostronglid nematodes in the European rabbit, Oryctolagus cuniculus (L)”. J. Parasit., 52, 1129–1133.CrossRefGoogle ScholarPubMed
Field, A. C, Brambeix, M. R. and Campbell, J. A., 1960.—“Spring rise in faecal worm-egg counts of housed sheep and its importance in nutritional experiments”. Parasitology, 50, 387–399.CrossRefGoogle ScholarPubMed
Gordon, H. MCL., 1948.—“The epidemiology of parasitic diseases, with special reference to studies with nematode parasites of sheep”. J. Aust. vet. Ass., 24, 17–45.CrossRefGoogle Scholar
Morgan, D. O., Parnell, I. W., AND Rayski, C., 1951.—“The seasonal variations in the worm burden of Scottish hill sheep”. J. Helminth., 25, 177–212.CrossRefGoogle Scholar
Naerland, G., 1949.—“Nutrition in relation to nematode parasitism in sheep”. Rep. 14th Internal, vet. Congr. Land., 2, 65–70.Google Scholar
Oshima, T., 1961.—“Influence of pregnancy and lactation on migration of the larvae of Toxocara canis in mice”. J. Parasit., 47, 657–660.CrossRefGoogle ScholarPubMed
Parnell, I. W., Rayski, C., Dunn, A. M. and Mackintosh, G. M., 1954.—“A survey of the helminths of Scottish hill sheep”. J. Helminth. 28 63–110.CrossRefGoogle ScholarPubMed
Paver, H., Parnell, I. W. and Morgan, D. O., 1955—“Some factors influencing the seasonal variation in worm egg counts in Scottish hill sheep”. J. comp. Path., 65, 220–235.CrossRefGoogle ScholarPubMed
Soulsby, E. J. L., 1957.—“Studies on the serological response in sheep to naturally acquired gastro-intcstinal nematodes. II. Responses in a low ground flock”. J. Helminth., 31, 145–160.CrossRefGoogle Scholar
Spedding, C. R. W., 1905.—Sheep production and grazing management. Baillière, Tindall and Cox. London.Google Scholar
Whitlock, J. H., 1949.—“The relationship of nutrition to the development of the trichostrongylidoscs”. Cornell vet., 39, 146–182.Google Scholar
Whitlock, J. H., Callaway, H. P. and Jeppesen, Q. E., 1943.—“The relationship of diet to the development of hacmonchosis in sheep”. J. Am. vet. med. Ass., 102,34–35.Google Scholar
Wilson, A. L., Morgan, D. O., Parnell, I. W. and Rayski, C., 1953.—“Hclminthological investigations on an Argyllshire hill farm”. Br. vet. J., 109, 179–190.CrossRefGoogle Scholar