240 



PARASITIC DISEASES OP THE SKIN. 



effects on the wool industry, that nearly all governments hare 

 ■enacted legislation aiming to control and eradicate the disease. 



Symptoms. 



When scab first breaks out in a flock of sheep the affected 

 ones will be noticed scratching, biting, rubbing themselves, tak- 

 ing hold of the wool and pulling it from the skin, causing the 

 fleece to have a rough uneven look, the wool fibres being stuck 

 together and wet where the animal has been biting the part. 



H Young 6t>:-lcgged Hcarus x loo. (Brown.) 



Sheep badly affected will be uneasy at all times, constantly 

 pulling and scratching, especially is this the case if they are 

 driven around and over-heated, the itching then becoming very 



severe. 



Co examine a Sheep for Scab. 



Part the atooI over the spot where the animal has been bit- 

 ing, and by closely examining the skin small whitish-yellow 

 elevations will be observed which present a marked contrast to 

 the normal pink skin. These elevations are caused from the 

 bites of the scab mites, which will be found on the wool fibres 

 in close proximity. As the mites increase in numbers, 



