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It appears that South Island farmers are currently achieving greater success than their northern colleagues in controlling Taenia ovis or sheep measles.
This comes from the latest analysis by the Ovis Management programme.
Ovis or sheep measles is caused by the T. ovis tapeworm. While it poses no risk to human health it can cause blemishes in sheep meat, which is undesirable for consumers here and overseas.
The Ovis Management programme works to promote the control of T. ovis through communication and collaboration. It also raises awareness of the importance of all dog owners regularly treating their dogs for the tapeworm.
Project manager Michelle Simpson says controlling sheep measles is important for the primary sector. She points out that while New Zealand currently has relatively low levels of sheep measles, an outbreak can result in downgrading or condemnation of otherwise healthy animals.
Only 20% of Ovis-affected carcasses are detected during meat inspection at processing plants, therefore the higher the prevalence rate, the higher the risk of meat from affected animals reaching the market.
“It costs farmers and processors a lot of money due to condemned stock,” Simpson explains.
“One concern with Ovis is that if a farmer is not the one sending their lambs for processing, they may not know that they are passing the problem on."
She says sheep measles can be controlled when farmers take the simple steps of regularly treating their dogs for the Taenia tapeworm.
“Dogs can become infected by eating untreated meat or offal, infected with live cysts. T. ovis is then spread to sheep through tapeworm eggs in dog faeces left in grazing areas. Eggs can also be spread from dog faeces over large areas, predominantly by flies.”
Simpson says best practice for dog health and sheep measles prevention is for all farm dogs to be treated monthly with cestocidal (tapeworm) drugs containing the ingredient Praziquantel — a cheap and effective treatment — and an All Wormer every three months.
“All dog owners, such as hunters or farm visitors, who take their dogs near farmland, or where sheep graze, should also dose their dogs every month, because the tapeworm has a 35-day lifecycle and dosing threemonthly is not enough to stop the parasite from spreading.
"As part of their on-farm biosecurity plan, sheep farmers should make this a condition of entry for all visitors bringing dogs onto the property.”
By The Numbers
Data from processors from 1 October 2021 to 30 June 2022 shows the Southland region had one of the country’s lowest occurrences of sheep measles identified in carcasses.
This is despite the region sending the highest number of animals for processing. Of 1,919,242 sheep processed in Southland, from 1,510 farms, 1,884 (0.1 % of carcasses) were found to be affected.
The highest number of sheep processed in a North Island area for that period was from Gisborne district, with 694,266 livestock from 431 farms. Of these, 5,355 (0.8 %) of carcasses were affected.
Most South Island districts recorded low proportions of affected carcasses, apart from Marlborough (0.9 %) and Kaikoura (1%).
Opotiki recorded the second highest proportion of sheep measles nationally (1.7 % of carcasses processed), followed by the Kapiti Coast (1.1 %). Whakatane (0.9 %), Otorohanga and Auckland (both 0.8 %) were also among areas with higher proportions of affected stock.
More: www.sheepmeasles.co.nz
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