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48
OCTOBER 2019
HERD HEALTH
Focus
www.irishfarmersmonthly.com
parasite-free in the spring. This helps to reduce pasture
contamination at turnout, thereby lessening parasitic
infection in the next grazing season. A targeted approach to
parasite treatments at housing increases the sustainability of
anthelmintic control and reduces the selection for resistant
parasites. For this approach to be e ective, farmers must
be able to identify individual cattle that are likely to have
a parasite burden. This can be achieved through weight
records and targets, or diagnostic testing, such as faecal
egg counts.
Alternatively, a strategic approach should identify groups
of cattle for treatment based on a number of risk factors,
including farm history, grazing practice over the summer,
anthelmintics treatments while at grass, and any clinical
signs of disease. The type of parasites likely to be present at
housing should guide your anthelmintic product selection.
While the important gutworm species Ostertagia ostertagi
and Cooperia oncophora are often both present at this time
of year, their sensitivity to anthelmintics does vary ­ so ask
your animal health advisor for guidance.
Some combination treatments o er convenience by
enabling the removal of a wider range of parasites, such as
gutworms and liver fluke.
Resistance to the flukicide triclabendazole is an emerging
issue in the sheep and cattle industries. Care should be
taken to preserve it for use in sheep, where there is no other
alternative for treatment of acute fluke disease.
Alternative treatments for fluke in cattle include those
containing closantel, clorsulon or nitroxynil. These
treatments may need repeating at the appropriate time after
the initial housing dose to ensure that all juvenile and adult
fluke are removed and cattle are turned out fluke free.
Dairy cows and heifers in calf have more restricted options
for liver fluke control due to milk withdrawal periods. Advice
should be taken from an animal health advisor.
Finally, consider external
parasites such as mites and lice,
and ensure your chosen housing
treatment provides adequate
control. Warm cattle sheds can
provide the ideal environment
for the multiplication and
spread of these parasites which
cause itching and welfare
issues, and can contribute to
reduced performance through
stress. Always ask for advice on
anthelmintics from your vet or
animal health advisor.
References:
1. Mejía et al (2009) E ect
of anthelmintics on
reproductive performance
and first lactation culling
rate in Holstein heifers.
Veterinary Record 165:
143­146
2. Perria et al (2013)
Gastrointestinal parasite
control during prepuberty
improves mammary
parenchyma development
in Holstein heifers.
Veterinary Parasitology,
198:345-350
3. Larsson et al. (2011)
Performance of second-
season grazing cattle
following di erent levels
of parasite control in
their first grazing season.
Veterinary Parasitology 175
(2011) 134-140
Supports the immunity
development of both the cow
and her unborn calf
Immuboost
Pre-Calver Range
contributes to:
Quicker easier calving
High quality colostrum
Increased disease
resistance and feed
e ciency
Reduced calf mortality
Tel: + 353 (0) 21 4507303
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