New Zealand Journal of Agricultural Research abstracts
Efficacy of injectable doramectin against naturally acquired louse infestations
on cattle
T. G. WATSON1*
D. M. BISHOP2
F. G. HOOKE3
A. C. G. HEATH2
D. J. W. COLE2
1AgResearch
Ruakura Agricultural Research Centre
Private Bag 2123
Hamilton, New Zealand
2AgResearch
Wallaceville Animal Research Centre
P.O. Box 40063
Upper Hutt, New Zealand
3Pfizer Agricare Pty Ltd
P.O. Box 57, West Ryde
NSW 2114, Australia
*Present address: Pfizer Animal Health, P. O. Box 3998, Auckland, New
Zealand.
Abstract Twenty weaner calves were ranked on the basis of
naturally acquired Linognathus vituli and Bovicola
(Damalinia) bovis infestations and allocated to one of two
equal groups. Calves in one group received doramectin (200 mcg/kg) by
subcutaneous injection near the base of the ear while those in the second group
were given 0.9% sterile saline by the same route. Louse counts at 7 sites
replicated on each side of the animals were carried out at the beginning of the
trial and then at 7, 14, 21, 28, and 42 days post-treatment. By 7 days
post-treatment the Linognathus vituli infestations were absent from all
treated calves and all but 1 control animal. Up to Day 21, all treated animals
remained louse-free. The doramectin-treated animals showed significant
(P < 0.05) reductions in Bovicola
(Damalinia) bovis infestations from 7 to 42 days
post-treatment. Efficacies of 81.9, 98.6, 94.2, 99.3, and 95.4% were obtained
for Days 7, 14, 21, 28, and 42 respectively, when comparisons were made with
non-treated animals for the same days.
Keywords doramectin; injection; endectocide; cattle; lice;
efficacy; Bovicola (Damalinia) bovis; Linognathus
vituli
New Zealand Journal of Agricultural Research, 1996, Vol. 39: 401-404
0028-8233/96/3903-0401 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (242K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
