12/19/2023 0 Comments Fly strike sheep treatmentTime crutching for just prior to the expected fly wave period and before the sheep become excessively dirty. The main crutching (autumn for spring shearing spring for autumn shearing) is a key time for tidying up sheep. Shearing or crutching time should be planned to coincide with the start, or just before the usual start, of the fly season - keeping in mind withholding periods and protection periods of chemical preventatives. In a non-mulesed flock the timing of crutching or shearing becomes even more important. If sheep are scouring, this protection can be reduced to three weeks. Shearing and crutching can give up to six weeks protection from breech strike. Shearing and crutching are key management tools for controlling flystrike. Identifying the most heavily scouring animals and removing them from the flock is a positive start. (This often occurs in mature sheep at the first contact of the season with large numbers of worm larvae and scouring results from an intense immune reaction which removes the larvae.) Visit the WormBoss website for regional recommendations. WECs will quickly determine whether scouring is due to large worm burdens so that drenching will quickly control it, or if it is due to a hypersensitivity to worm larvae where few worms are present and treatment will have little effect. Breech cover is also an important determinant of breech strike in winter rainfall areas and its importance increases with increasing dag and wrinkle score. Use worm egg counts (WEC) to check whether worm numbers are reaching significant levels while sheep are on green feed.Ī dag score 4 animal can be up to seven times more susceptible to breech strike than a dag score 1 animal in the same mob. Follow a plan to minimise worm burdens and resulting scouring. Notes on best practice treatment of flystrike.Scouring and therefore dag formation is usually caused by sheep worms. Video of best practice treatment of flystruck sheep.ĭownload E93_Treating_flystruck_sheep_Web_video_small_WMV_4x3.wmv (4 MB) Adult sheep that sustain repeated flystrike (crutch or body) are best removed from the property.ĪRE YOU CONCERNED THAT BLOWFLIES ON YOUR PROPERTY ARE RESISTANT TO CHEMICALS?įree testing during the summer of 2018/19 can provide the answer.They can be maintained with extra protection as dry sheep. Sheep that have been provided suitable management and/or chemical protection, but have become struck when most of their flockmates have not are best culled from breeding programs to improve both current and future flock resistance to flystrike. Susceptibility to flystrike is heritable and repeatable.Moving struck sheep to a ‘hospital’ paddock allows closer monitoring of recovery and reduces the risk to the rest of the mob.ĥ.Leaving struck sheep in the mob attracts more blowflies.One of the dicyclanil or cyromazine preventatives may also be applied if longer ongoing protection is required. There is a high level of resistance to the organophosphate, diazinon, which may reduce its effectiveness in killing larger larvae. Where maggots may remain, a dressing that rapidly kills maggots should be applied these contain either ivermectin, spinosyn or organosphosphates. Vetrazin), when applied alone, are not suitable on welfare grounds, as maggots will take up to 4 days to die. Where maggots remain, the two common flystrike preventatives, dicyclanil (e.g. A dressing has two purposes: to kill remaining maggots and to prevent re-strike as the affected area is drying and healing. Note: A product registered as a flystrike “dressing” is different to a preventative.Ensure a product with a suitable withholding period is chosen. If necessary, these treated sheep may be jetted or backlined along with other susceptible sheep to provide long-term flystrike protection.Apply a registered flystrike dressing to the shorn area to prevent re-strike. Unless maggot infested wool is collected and bagged, most maggots will survive and pupate and come back as adult flies.ģ. Don’t rely on registered flystrike dressings to kill maggots-some are incapable of killing large maggots and many maggots escape treatment by dropping from the sheep and burrowing into the soil before the insecticide can be applied.
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