8: SCOPS/control of GIN Flashcards
What’s the advantage of giving ewes extra protein?
Can maintain immunity, grow lambs, produce milk
How else can you improve immunity to worms?
By correcting mineral defiencies
Which breed are especially susceptible to GINs?
Suffolk
How do you score a ram for worm resistance?
FEC at 21 weeks
What counts as clean grazing?
New leys, previous horses or cows, ungrazed for 2 years, last grazed by adult ewes, few parasitic worm larvae
Which 4 factors affect grazing risk?
Herbage height, UV light, humidity, rainfall
What is the advantage in finishing lambs quickly?
They are off the farm before major worm challenge
How do bio-active forages work?
Reduce worm impact due to tannins and high proteins and trace elements e.g. chicory
How does nematophagous fungus work?
Grows in dung and eats the worm larvae
What is a disadvantage of nematophagous fungus?
Needs continual administration
In which kind of sheep do you see tolerance?
Hill ewes - with high egg count but no disease
What does resilience mean?
The capacity to maintain production in the face of challenge
What is heritability of resilience like?
Low
Does resilience correalte with resistance?
No
What MUST you do if treating clinical or subclinical disease?
Prevent heavy reinfection
How do you detect AMR?
Submit faecal samples after drenching to check the count is 0
What can you do instead of long acting product?
Frequent dosing
Is under-dosing or frequent treatment a more important mechanism of resistance?
Frequent treatment
Why should you withold feed before drenching for 24 hours?
Increases drug concentration by 40%
Why is treating ewes at lambing time a heavy selector for resistance?
Already start the season with resistant ewes
How many more eggs do ewes with twins and triplets shed around lambing than singles?
70-90%
Do ewe lambs or ewes shed more?
Ewe lambs
Which pregnant ewes should you not treat?
Singles, or twins or triplets of BCS 4 or higher
How much below the target weight growth should you treat?
Any growing less than 0.66 of the target weight
How many wormers should you use at one time?
2-3 - but don’t mix
What is productivity like in SCOPs farms?
Higher
How do you treat new sheep on arrival?
With a wormer with no known resistance, then house for 48 hours so no eggs end up on pasture
How can you preserve in refuga?
Leave 10% untreated, move to new pasture then treat, leave on contaminated pasture after treatment to pick up unexposed worms
