Text Appearing Before Image: l-taneously or consecu-tively. Hocks of everyvariety of size and confor-mation, from the biggestand best to the smallestand weakest, are liableto become affected, but it goes without saying that the disease is mostfrequently found in the latter. Causes.—The predisposition to spavin is uncjuestionably hereditary.Horses with straight quarters and upright pasterns seem especially liableto it. SjDrain and concussion to the joint, acting se^iarately or together,are the exciting causes, and there is reason to think that these accidentsare more e.specially likely to occur when animals are forced in their woikunder circumstances of fatigue and want of condition and development.The outward enlargement is an evidence of the inflammation going on inthe articular surfaces of the bones. The great variation found to exist in the conformation of the hocksof different horses, and indeed sometimes in the two hocks of the samehorse, has ever been a stumbling-block to the veterinarian in the diagnosis Text Appearing After Image: Fig. 324.—Bone-Spavin. 218 HEALTH AND DISEASE of spavin, and a mine of wealth to lawyers and learned counsel. Coarse-ness or lumpiness is a recognized condition of normal development in thehocks of some horses, and to distinguish between the natural irregularities-of coarseness and those resulting from disease is always difficult and some-times impossible. If these facts were more generally recognized andallowed by veterinary practitioners, much of the litigation which nowengages our law-courts would be avoided, and the veterinary professionwould be saved from those strange exhibitions of discrepancy which tendto weaken public confidence in their opinion and advice, if they do notengender distrust. Symptoms.—The immediate effect of the jar or sprain giving rise tospavin is to produce lameness, sometimes slight, sometimes severe. Thismay or may not pass away, to return again when the enlargement of thehock appears and encroaches upon the connecting ligaments of the joint.The action
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