The Agricultural Aspect of Tuberculosis

1894 Boston Medical and Surgical Journal  
for a cow as it is for the rest of the animal kingdom yet it is something the dairy cow does not get. Every one knows that exercise increases the flow of blood to the muscles ; and in consequeuce of the greater amount of waste products carried off, and the greater amount of oxygen required by the system, a quickening of the heart's action and a quickening of breathing result. On the other hand, when little or no exercise is taken, the circulation becomes sluggish, and the heart, like any other
more » ... rt, like any other muscle, degenerates for waut of use ; the breathing becomes shallow, and the lungs are not expanded. When any extra strain is put upon them, they are not able to do their work ; and we have rupture and permanent dilatation of aircells, along with weak lungs and a predisposition to pulmonary disease. Exercise, on the other hand, causes an increased flow of blood to the lungs, with au increased vitality and strength. The increased flow of tidal air in and out of the lungs will tend to prevent the slow-growing tubercle bacilli finding lodgement, and in this way prevent their growth and development iu the luugs. In referring to exercise, I don't wish to be understood as advocating a large field or range for the cattle to run over. I don't wish to advocate anything impractical ; but I do think that the present method of confining the dairy cattle with stanchions is capable of improvement. I do think they ought to be allowed their liberty ; and further I do not see anything impractical in any such suggestions. Any condition that affects the comfort of the animals must affect their general well-being. Every one here must have seen how cows will rub and scratch themselves when first let out for water ; often, even when thirsty, they will not touch the water till they have first licked themselves all over. It is impossible to stand behind a row of cattle for five minutes without seeing one or the other make a more or less ineffectual effort to scratch the body. No animal can be comfortable confined as they are in New England at the present time. Every one knows that these conditions exist and are detrimental to the health of the animal. Then why are they not attended to ? It is because through force of habit we have got accustomed to them, we simply take it for granted that these conditions cannot be improved. --
doi:10.1056/nejm189411291312204 fatcat:2zrh6xzu3zdftnbecpyif5ez3m