Anthelmintic resistance among gastrointestinal nematodes of cattle on dairy calf to beef farms in Ireland

Table 4 Efficacy of levamisole (LV) and moxidectin (MOX) against Cooperia spp. and Ostertagia spp. on Irish dairy calf to beef farms

Farm	Pre-treatment			Post-LV treatment			Post-MOX treatment
Farm	No. L3	%*Cooperia*	%*Ostertagia*	No. L3	%*Cooperia* (%efficacy)	%*Ostertagia* (%efficacy)	No. L3	%*Cooperia* (%efficacy)	%*Ostertagia* (%efficacy)
2	100	100	0	100	67 (87)	33 (0)^a	100	95 (46)	5 (0)^a
4	100	76	24	N/A	N/A	N/A	N/A	N/A	N/A
5	100	41	59	N/A	N/A	N/A	N/A	N/A	N/A
8	100	95	3	N/A	N/A	N/A	100	99 (86)	1 (96)^a
9	100	99	1	N/A	N/A	N/A	100	100 (48)	0 (100)^a
14	100	87	13	N/A	N/A	N/A	–	–	–
15	100	22	87	NC	NC	NC	N/A	N/A	N/A
17	100	78	22	N/A	N/A	N/A	NC	NC	NC
18	100	97	3	100	91 (80)	9 (37)^a	100	100 (92)	0 (100)^a
19	66	100	0	N/A	N/A	N/A	100	100 (67)	0 (ND)^a
20	100	95	5	N/A	N/A	N/A	100	100 (92)	0 (100)^a
23	100	100	0	N/A	N/A	N/A	100	100 (5)	0 (ND)^a

N/A not applicable: treatment was considered effective
NC not calculated: pre-treatment FEC < 40 epg
ND not determined: efficacy could not be determined as the genus was not detected pre-treatment
- no larvae recovered
^a Pre-treatment egg count apportioned to genus < 20 epg

ISSN: 2046-0481