01644naa a2200349 a 450000100080000000500110000800800410001910000190006024501100007926000090018952006690019865000310086765000140089865000100091265000240092265000140094665000190096065000170097965000100099665000180100665300130102465300170103765300170105465300310107165300280110265300200113065300160115065300160116670000180118270000190120077300750121915221252023-11-06       1937    bl uuuu     u00u1 u    #d1 aSTEWART, M. A.  aResistance of sheep of different breeds to infestation by Ostertagia circumcincta.h[electronic resource]  c1937  aAbstract : A group of 29 lambs consisting of 5 breeds and one group of cross-breds was pastured on irrigated pasture and given supplementary food. Ostertagia circumcincta was known to be present on the pasture and the authors, assuming that the egg count indicated the degree of infestation with O. circumcincta, have shown by fortnightly egg counts over a period of one year that there was a significant variation in the susceptibility of the different herds to this infection. The results are analysed by Fisher's pairing method and show that Romneys are outstanding in their resistance, followed by Rambouillet, Southdown, Shropshire and lastly Hampshire sheep.  aAnimal parasitic nematodes  aHelminths  aLambs  aNematode infections  aParasites  aSheep diseases  aStrongylidae  aOvino  aParasitologia  aControle  aEctoparasito  aHelminthoses  aNematódeo gastrintestinal  aOstertagia circumcincta  aParasitic worms  aParasitosis  aSecernentea1 aMILLER, R. F.1 aDOUGLAS, J. R.  tJournal of Agricultural Researchgv. 55, n. 12, p. 923-930, Dec. 1937.