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Flystrike is an awful disease, where struck sheep can die within 48 hours. Early signs of flystrike can be difficult to observe, so prevention is your best option.
Wairoa-based sheep and beef farmer, Jonathan Neilson relies on Cyrex™ Liquid for the prevention and treatment of flystrike, as it has proven to be effective year after year.
Jonathan is Farm Manager at Pihanui Station, which is 1,360 ha, mostly south facing and typically rolling hill country. The station is home to approximately 6,500 Romney sheep, with 1,100 head of cattle grazed over winter.
The Pihanui team work closely with the team at PGG Wrightson Wairoa. “We do all our animal health and cropping through PGG Wrightson and really value their input on-farm,” says Jonathan. “I probably talk to Store Manager, Michael (Redward) at least weekly.” Pihanui Station is also supported by PGG Wrightson Technical Field Representative, Paul Kahaki.
Michael notes that weather and flies probably provide the biggest challenges to farmers in the area. Situated north of Napier and south of Gisborne, the environmental conditions are both a benefit and a challenge to sheep farmers. There are dry and humid conditions from about mid-November through to April. The heat and humidity through summer and autumn create ideal conditions for fly activity and the animals are hugely susceptible to flystrike.
“Of course, the weather is changeable. This year, we saw flystrike cases as late as July!” explains Michael.
“Cyrex Liquid has worked to protect and treat the sheep on Pihanui Station for several years,” Michael notes.
“It is a good product for preventing flystrike, but it also kills any live maggots on the sheep. I believe it is one of the most superior dips on the market for longevity on the animal.”
“Most farmers use it during flystrike season, some also use it on rams prior to mating for protection against lice,” Michael adds.
Cyrex Liquid is designed to eliminate flystrike, maggots and lice in sheep. It provides flystrike protection for up to 12 weeks, depending on the season.
In Jonathan’s opinion, Cyrex is gentler than other products he has used in the past.
“I like Cyrex because it’s not as hard on the sheep, other products used to burn their skin,” he says. “It is also more effective in small doses, it does not take much to treat a sheep with active flystrike.”
Cyrex contains both Cyromazine and Spinosad, making it highly effective in killing flies and maggots. With no organo-phosphates, it is also safer for humans to handle. For best results, Cyrex should be applied to dry wool.
“We like the 12 weeks of protection for peace of mind. Plus, it is guaranteed to kill any maggots on the sheep, so we don’t have to physically check every animal,” Jonathan adds.
Jonathan and his team treat the hoggets with Cyrex at the start of November. Every other sheep is dosed at the end of November, at weaning. The lambs are treated again post-shearing and the ewes again pre-mating (normally mid-February).
“Cyrex is very reliable,” concludes Jonathan. “It costs a bit, so we wouldn’t use it if it wasn’t effective!”
Sponsored by Elanco
Managing Facial Eczema (FE) requires a multipronged approach that involves reducing spore intake and providing zinc as a prophylaxis and therapy.
FE is caused by a mycotoxin produced by the fungus Pithomyces chartarum growing in pasture dead matter. This fungus multiplies rapidly when overnight temperatures are above 13 degrees Celsius and when there is moisture available. The fungal spores are ingested by livestock and release a toxin called sporidesmin, which is concentrated in the bile of the liver causing significant liver damage. This causes phylloerythrin, a breakdown product of chlorophyll which builds up in the blood stream and reacts with sunlight causing photosensitivity and the lesions we recognise as FE. By the time you see the physical signs of FE, there is already significant liver damage in a large proportion of the mob.
Zinc helps to reduce FE incidence. The mycotoxin in sporidesmin is a thiol compound. Thiols react with certain metals to form stable compounds called mercaptides that do not cause tissue damage. Zinc is a mercaptide forming metal and is able to prevent and limit tissue damage from the sporidesmin. It is important to note that chelated zinc does not have this protective effect.
Zinc prevention needs to occur two to three weeks prior to the risk period to build up protective levels in the animal (see Zinc dosing steps). When spore counts are rising towards 30,000, begin zinc supplementation so that by the time counts actually reach 30,000, the animals are receiving 2 g of zinc per 100 kg.
The most effective treatment for preventing facial eczema is the use of The Time Capsule®. It contains zinc oxide, providing four weeks protection in cattle and six weeks in sheep. Repeated treatments extend this protection period. It is a safe and easy-to-use bolus, that leaves no residue and removes the guess work from dosing.
In a 2019 trial¹, The Time Capsule was administered to cattle on two farms over a period of two months. Animals were blood sampled and weighed each week to determine liver function and serum zinc levels. The Time Capsule performed well with serum zinc levels rising quickly in all animals to be greater than the protective level of 18 umol per L at the first sampling one week after administration. The levels remained consistently protective through the eight week study.
Liver function in the animals remained well within the normal parameters indicating that the cattle were protected. There was no relationship seen between the serum zinc levels and weight gain. Weight gain was not affected by the zinc treatment on the two farms.
If animals are affected with clinical FE, it is still worthwhile treating them with zinc. Treatment helps to reduce the continuing liver damage and allow for recovery. Zinc can also be supplied through supplementation in water and feed using products like Zinc Oxide, Zinc Sulphate Heptahydrate and Zinc Sulphate Monohydrate. If you are going to supply the zinc through water or feed, give animals an oral drench to lift levels quickly and safely. The zinc content of supplements varies, so check with your PGG Wrightson store or Technical Field Representative to calculate the correct dose for the product you are using. Blood samples can be analysed to check that the animals are receiving a protective dose.
For more advice around FE treatment or prevention, contact your local PGG Wrightson Technical Field Representative or store.
¹ 2019 New Zealand trial approved by an animal ethics commitee, conducted by an independent research company.
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