Term
| What are the agents that can cause damage to the skin or wool of sheep in australia? |
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Definition
Endemic - Lice, flies, dermatitis, grass seeds, fleece rot, lumpy wool
Exotic - Screw worm flies, scrapie, sheep scab (mites) |
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Term
| What are the types of lice that affect sheep in australia? |
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Definition
Bovicola ovis (biting louse)
Linognathus pedalis and ovillus(blood sucking louse) |
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Term
| How does the biting louse cause fleece damage? |
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Definition
| They feed off skin cells, wax and bacteria on the skin surface and cause irritation to the skin. The sheepie rubs against stuff and bite at their fleece (causing pruritus). |
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Term
| What are the risk factors associated with bovicola ovis? |
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Definition
Clinical signs seen in late winter
Young or old animals
Low BCS |
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Term
| How do the Linognathus spp lice cause disease? |
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Definition
Blood sucking louse
Lice form stationary clusters, heavy infestations spread across abdomen and scrotum
Heavy infestations cause stamping and biting (may result in lameness or puritis)
Pedalis can survive far longer off the sheep than ovillus |
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Term
| What are some classes of drugs that can be used to control flystrike? |
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Definition
- Ivermectin (preventative or a wound dressing, fast acting)
- IGRs (Insect growth regulators (aka Clik), safer for people, slower to effect)
- Organophosphates (toxic to everything, known resistance) |
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Term
| What are the applications methods available for the topical treatment of lice/flystrike? |
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Definition
- Jetting (handjetting is the most effective long wool treatment method, automatic race jetting is faster, but less effective)
- Spray ons (Can be used for long wool, more expensive)
- Dipping (emergency treatment only, can do large number at once |
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Term
| WHat are some considerations when choosing a chemical to use? |
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Definition
| Chemical class, application methods, WHP, WHI, ESI, cost/head |
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Term
| What are some non-chemical tools for preventing flystrike? |
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Definition
Shearing, crutching, lambing dates
Breech modification (mulesing is the best we have right now), genetic selection
Ensure correct length for tail docking |
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Term
| What are the increases in risk for flystrike based on the 1-5 dag score? |
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Definition
1 - 1
2 - 2X
3 - 4x
4 - 7x
5 - 15x |
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Term
| How do you treat flystruck sheep? |
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Definition
Shear struck wool + 5cm barrier
Collect maggotty wool in a plastic bag and leave in the sun for a few days
Apply registered product to shorn areas
Move sheep to hospital paddock
Cull repeat cases from breeding herd |
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Term
| In regards to the treatment of lice, what is considered 'long wool'? |
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Definition
| More than 6 weeks of wool growth |
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Term
| When should you treat for lice? |
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Definition
- If it more than 6 months before the next shearing, use IGRs
- If >10% of sheep are rubbing and it is less than 4 months till next shearing, you can wait
- if >10% are rubbing and shearing is more than 120d away, tx now
- If >50% are rubbing, but searing is within 90d, wait
- If >90% are rubbing and shearing is within 70d, wait |
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Term
| What lice control product are available for long action hand-jetting? |
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Definition
Fleececare (DFB) 180d WHI
Strike (DFB) 180d WHI
Zinjet (Ivermectin) 42d WHI |
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Term
| What lice control products are availale for long wool backlines? |
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Definition
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Term
| What lice control products are available for short action hand jetting? |
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Definition
Extinosad (Spinosad) 0d WHI
Blowfly and Lice jetting fluid (ivermectin) 42d WHI
Paramax (Ivermectin) 42d WHI
Zinjet (Ivermectin) 42d WHI |
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Term
| What long woll backline treatment can be used within 6 months of shearing? |
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Definition
| Extinosad pour-on (Spinosad) 0d WHI |
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Term
| What are some short wool, of 'off-shears' treatments available? |
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Definition
Avenge (Imidacloprid) 180d WHI
Clik Plus ( DFB and Dicylanil) 180s WHI
Magik (DFB and Dycyckanuk) 180d WHI
Triflumuron 60d WHI
Extinosd (Spinosad) 0d WHI |
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Term
| What should you do with sheeps that are new to the farm with regards to licies? |
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Definition
If they are short wool - treat with an off shears product and then quarantine for 3 months
Long wool - If you are sure they have been treated, monitor them. If unknown treatment history - Isolate for at least 3 months, monitor regularly |
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Term
| In regards to wool sheep, what are the important withholding periods? |
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Definition
ESI - export slaughter interval
Meat WHP
WRP - Wool rehandling period (period before you can touch the sheep without PPE)
WHI - wool harvesting period, time between tx and shearing |
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Term
| Rank ectoparasite treatments high to low in terms of neg effect on human health |
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Definition
High - Organophosphate
Med - Synthetic Pyrethroids
Low - IGRs, Spinosyn, ML, Mag Fluorosilicate, Neonicotinoid |
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