Summarise the problem that has led to the animals’ owner seeking your help.
1.Observing some animals slower in the mob and get behind during mustering
2.Having about 10% of animals recumbent by the end of mustering with many dead very soon after
Identify a likely diagnosis for the problem described and the features in the scenario that make your diagnosis likely.
Haemonchosis,
A-Haemonchosis is most common in Queensland and Northern half of New South Wales where summer rainfall is dominant. Goulburn is a non-seasonal rainfall region(Uniform rainfall) with warm summers and infection with Haemonchus could be seen with increasing rainfall.
B-The scenario tells us that this year they have had unusual high rainfall in summer and green pasture that both helps the life cycle of Haemonchus which is a direct short life cycle(21 days).When it’s moist and warm, worm eggs in faeces hatch to L1 and L2,then L3 migrates out of the faeces and climbs up the grass, ingested by sheep and becomes adult that can live many months within the sheep’s gut to reproduce and lay egg in appropriate time. This life cycle matches with the scenario which mentions warm, wet weather and availability of green grass.
C-Merinos are more susceptible to Haemonchus and younger animals more susceptible and here we have a fine wool merino flock with mostly weaners affected.…show more content… In this case an option is using Closantel as preventative with either or both of our summer drenches and/or in autumn depending on local conditions and worm test result. However since there is some resistance against closantel, first we have to check if closantel is still effective in this property by doing drench test or at least a worm test after using closantel(We shouldn’t find any Haemonchus egg in the faeces of sheep 6 weeks after treatment with closantel).If there is resistant we have to use alternative
