Goat farmer Bill Campbell, of Dumbarton, Central Otago, said the goat fibre industry was facing a drench resistance problem. Photo by Yvonne O'Hara
Goat fibre farmers Bill and Irene Campbell, of Dumbarton,
Central Otago, will be showcasing their 500-goat flock to
delegates from the inaugural New Zealand Goats (NZGoats)
conference on Friday.
One of the topics of conversation is likely to be drench
''It is a big problem within the industry and I believe that
most angora goat farmers have problems with it,'' Mr Campbell
He said he would like to see the drench manufacturing
companies research the correct dosage rates and withholding
periods for goats and include them on the tables on the
However, he was not optimistic that would happen, as the
research process would be an expensive exercise for the
companies and there were not enough goats in the national
flock for it to be cost-effective.
He said some farmers were delivering one-and-a-half times to
twice the recommended dose per 10kg of liveweight and that
practice was encouraging drench resistance.
However, he said he and his wife kept to the recommended
dose, as per the label.
He would also like to see a drench gun developed that had
finer increments of 1ml markings, similar to an inoculation
''We drench with a syringe, not a drench gun, as they are not
accurate enough,'' Mr Campbell said.
He said they weighed a few of the animals in their flock at
drenching time to get an eye for the weight, then
eye-appraised the rest and then determined the amount of
drench that each individual animal should receive.
''Goat farmers should not give the same drench amount to
''Each animal should receive the correct dose, according to
its weight, whereas a standard drench gun gives an average
dose, according to the heaviest animal.
''Alternatively, they should draft animals according to
They have been rearing goats since 1986 and will drench
during the autumnal high pressure season for parasites, and
when they think their animals need it.
Drenching starts from 3 months of age to 2 years.
''Our policy is to drench all those that need it, but we do
lose the odd one,'' he said''Anything that is big and healthy
is not drenched.
''Some goats can be healthy one day and four days later have
a big worm burden.
''When we start to see a few dirty bums, hollow guts, tails
down and slow moving, and then we drench.''
The goats are usually drenched once with a single dose, but
if there is no noticeable results after about three weeks,
they would then consider drenching twice in a 24-hour period,
with one of the drenches being a combination drench.
They also use two different families of drench, so if they do
not get a 100% kill with one, the other will hopefully take
care of the survivors.
''We get good results with this programme, without resorting
to increasing dose rates,'' he said.
''Drench resistance could put the goat industry in jeopardy
if we don't get right.''
- by Yvonne O'Hara