LAMENESS AND DISEASES, ETC. 



155 



Fig. 52. contkacted hoof. 



long and the growth of 

 hoof becomes excessive, 

 or the horse may be al- 

 lowed to stand in his stall 

 in hot dry weather with- 

 out sufficient exercise, 

 whereby his feet become 

 dry, hard and feverish. 

 A, Spur of frog forced above level of core- and such conditions are 



nary band. B, B, Bars forced above level exciting causes of contrac- 

 of coronary band. C, C, Abnormal height 



of heel from coronet to ground surface. tion, and horses thus af- 



fected are also more apt 

 to stumble and cut themselves than would otherwise be the case. 

 Fig. 52 shows a contracted hoof pro- 

 duced by an abnormally high wall. The 

 appearance of the same hoof on its ground 

 surface is represented in Fig. 53. The 

 base of the hoof had wired together un- 

 til the bars and spur of frog were raised 

 above the level of the coronary band, 

 against which the coffin-bone was also 

 compressed by being forced upward, im- 

 peding or altogether stopping the func- 

 tional activity of the vascular tissues, and 

 causing a calcareous deposit or bony 

 formation around the coronary cushion, 

 producing stiffness in the foot joints. By 

 the contraction across the quarters, the 

 foot was relatively elongated, the heels 



narrowing and closing the commissures in heiglit of heel at coro- 



.,, .Li i? 1 1 • 1- net. F, F, Contracted 

 With an overgrowth ot sole, and pinching ' ' r> t< ,. 

 & ' r o across quarters. C, Loa- 

 the frog, as it were in a vise, between the tracted deft. D, D, Con- 



bars, destroying all the expansive powers ''^'''^^ ^'f'\ 'f ^7' 

 ' J & J: -c E, E, Contracted quarter 



. of the foot. Contraction may be easily at base. 

 11 



Fig. 53. lower face of 

 same hoof. 



A, A, A, A, Abnormal 

 height of heels from coro- 

 net to base. B, I'ilTerence 



