02150naa a2200229 a 450000100080000000500110000800800410001902000190006010000190007924501030009826000090020130000130021052013270022365000230155065000310157365000220160465000250162670000170165170000190166870000200168777302130170721010322019-01-11       2018    bl uuuu     u00u1 u    #d  a978854731475-01 aMACNEIL, M. D.  aTarget selective anthelmintic treatment use in beef cattlebis it worth it?h[electronic resource]  c2018  ap.53-61.  aIntestinal parasitism, specifically parasitism caused by Cooperia oncophora, Ostertagia ostertagi and Haemonchus placei has been identified as an important cause of production loss in cattle. The control of these parasites relies strongly on the administration of anthelmintic drugs. However, the effectiveness of anthelmintics is threatened by the increasing prevalence and severity of anthelmintic resistance. Several novel control approaches are currently proposed, and among them the target selective anthelmintic treatment (TST) to individual animais instead of the whole herdo However, ali selective treatment strategies come with additional costs for labor and diagnostics. The pros are the slowing of resistance prevalence, lower residues of anthelmintics in meat and rnilk; the cons are the difficulty and time spent on selecting animais in need of treatment, costs with diagnostics and the possibility of lower production. Probably, in beef cattle the uses ofTST have more economic benefits when realized in animal between weaning and 24 months of age. The aim of TST uses is to reduce the frequency and number of treatment with anthelmintics and to maximize the potential benefit by considering environmental and management factors, carrying out less selective pressure on nematodes populations in cattle herds.  aCooperia oncophora  aGastrointestinal nematodes  aHaemonchus placei  aOstertagia ostertagi1 aMINHO, A. P.1 aCARDOSO, F. F.1 aYOKOO, M. J. I.  tIn: MOLENTO, M. B.; MILLER, J. (Eds.). Movel approaches to the control of helminth parasites of livestock: facing the challenge of helminth infections in tropical and sbtropical areas. Curitiba: Appris, 2018.