caa a22 4500 388036095 CHVBK 20180307125005.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1017/S000748530002589X doi S000748530002589X pii (NATIONALLICENCE)cambridge-10.1017/S000748530002589X Floate K.D. Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Lethbridge, Alberta, Canada, T1J 4B1 Does a repellent effect contribute to reduced levels of insect activity in dung from cattle treated with ivermectin? [Elektronische Daten] [K.D. Floate] A two-year pitfall trapping study was performed to test the preference of coprophilous beetles (Hydrophilidae, Scarabaeidae, Staphylinidae) for dung from untreated cattle versus dung from cattle treated topically one or four weeks previously with a recommended dose of ivermectin in a pour-on formulation. In 1994, significantly more Aphodius fimetarius (Linnaeus) and A. distinctus (O.F. Müller) at each of two sites were collected with dung from treated cattle. No differences were detected for other taxa. In 1995, significantly fewer individuals of ten taxa, including A. fimetarius and A. distinctus, were collected with dung from treated cattle. No differences were detected for other taxa. A change in cattle diet may have altered levels of faecal residues, thereby changing beetle preferences between years. Comparisons between periods of spring and autumn activity identified a change in seasonal preferences for at least some species. Similar numbers of Onthophagus nuchicornis Linnaeus and of A. fimetarius were collected in spring with dung from treated or untreated cattle, but significantly more individuals of both taxa were collected in autumn with dung from untreated cattle. In contrast, the preference of Aphodius prodromus Brahm for dung from treated cattle was unchanged between spring and autumn. These results show that ivermectin therapy does influence the colonization of dung from treated cattle. However, the nature of this influence is confounded by extraneous factors. Until such time that these factors can be accounted for, general predictions regarding the effect of ivermectin therapy on the colonization of dung by coprophilous insects are premature. Copyright © Cambridge University Press 1998 Bulletin of Entomological Research Cambridge University Press 88/3(1998-06), 291-297 0007-4853 88:3<291 1998 88 BER https://doi.org/10.1017/S000748530002589X text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S000748530002589X text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Floate K.D. Agriculture and Agri-Food Canada, Lethbridge Research Centre, PO Box 3000, Lethbridge, Alberta, Canada, T1J 4B1 NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/3(1998-06), 291-297 0007-4853 88:3<291 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge