LAMENESS AND DISEASES, ETC. 



155 



Fig. 5i'. cuxtkacted 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 suificient exercise, 

 whereby his feet become 

 dry, hard and feverish, 

 A, Spur of frog forced above level of coro- 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, p,^^ gg 

 producing stiffness in the foot joints. By 

 the contraction across the quarters, the 

 foot was relatively elongated, the heels 



LOWER FACE OF 

 SAME HOOF. 



A, A, A, A, Abnormal 

 height of heels from coro- 

 net to base. B, DifTerence 



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



.,T <Li J? 1 1 • 1 • net. F, F, Contracted 



with an overgrowth or sole, and pinching 



across quarters. C, Con- 

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



bars, destroying all the expansive powers ^Ji^^^if^^ ^f^\ f ^'•«g- 

 ' .; o r -^ _ E, E, Contracted quarter 



of the foot. Contraction may be easily at base. 

 11 



