126 HORSE-BREEDING FOR FARMERS CHAP. 
Roaring and Whistling 
This is detected in the stable by taking hold of 
the horse’s head, and making a feint at him as if 
about to strike him on the flank. If a roarer he will 
snort or grunt—but some horses will grunt at this 
process when sound. Unsoundness in the wind is 
detected easily by listening to the “inspiration ” in 
breathing after a good gallop or ten minutes’ 
lunging. 
Cause— Heredity ; strangles; influenza; and 
bearing-reins. 
Crib-biting and Wind-sucking 
Cause.—The habit is fostered by impure or heated 
stables, or by anything likely to prejudice the horse’s 
digestive powers; but it is also due sometimes to 
“want of work”; one crib-biter may often infect a 
whole stable with the habit. 
Treatment.—This tiresome fault may be cured if 
the habit has not been too long indulged in. Pre- 
vention is better than cure, and mangers and racks 
should be made of iron or so constructed that a horse 
cannot lay hold of any part of the stable fittings 
within reach of him, with his teeth. 
Lnfluenza 
This complaint is highly infectious and con- 
tagious. 
Symptoms.—The white of the eye becomes yellow 
or red or both. The horse blows more or less and 
appears weak and lethargic; runs at the eyes; sore 
