Íslenskar landbúnaðarrannsóknir - 01.09.1974, Síða 23

Íslenskar landbúnaðarrannsóknir - 01.09.1974, Síða 23
SHEEP PARASITES IN ICELAND 21 Larvae pr.g faeces Muellerius Dictiocaulus % o.f sheep carrying _ capillaris filaria Moniezia expansa 100- h5 • 0- Fig. 16. A hypothesis concerning the following factors in faeces from sheep: The variation in the number of Eimeria ovocysts, the variation in the number of eggs of Nematodirus spp. and „other strongyles", the variation in the number of larvae of Mullerius capillaris and Dictyocaulus filaria, the frequency in occurence of Moniezia expansa and the variation in faecal consistency. All factors are put in xelation to thethe age of the sheep and time of year. REFERENCES Ayalew, L. and H. C. Gibby. Seasonal fluctua- tions in breeding ewes and lambs. Canad. J. Comp. Med. 1973, 37 (1), 79—89. Connan, R. M.: The post-parturient rise in faecal nematode egg count of ewes; its aetiology and epidemiological significance. World Rev. Anim. Prod. 1968a, 4 (16), 53—57. Connan, R. M.: Studies on the worm populations in the alimentary tract of breeding ewes. J. Helminth. 1968g, 42, 9—28. Dunsmore, J. D.: Ostertagia spp. in lambs and pregnant ewes. J. Helminth. 1965, 39, 159— 184. Field, A. C., M. R. Brambell and J. Allan Camp- bell: Spring rise in faecal worm-egg counts of housed sheep and its importance in nutritional experiments. Parasitology 1960, 50, 387—399. Gibbs, H. C.: Some factors involved in the „spring rise" phenomenon in sheep. Proc. 3rd Int. Conf. Wld. Assoc. Adv. vet. Parasit. 1967, ln „The reaction of the host to parasitism", 160 —173. Gíslason, G.: Ormar í búfé á Islandi (Helminths in farm animals in Iceland) Læknablaðið 1968, 54 (1), 19—32. Engl. summ. Helle, O.: The effect on sheep parasites of grazing

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