Sheep, when displaying symptoms of rot, should always be kept dry and warm. If they must be retained throughout the winter, good sound solid food, such as well made hay or oats, should be afforded them, and the shelter of a straw yard should if possible be obtained. A liberal supply of salt should be given with all their provender; and if they do not seem to relish it, give them occasionally a small quantity in water as a drench.
(166.) _Prevention of Rot._ On this head I need do little more than remark that attention to the causes will go a great way to point out the necessary means for its prevention. Admission of the sheep to rank soft grass, heavy stocking, short allowance of food during winter, every thing in fact which leads to the exposure of the animal should be scrupulously avoided. The strongest constitution cannot with impunity be tampered with, and the soundest habit will fall before the mining attacks of want and weather. Keep your stock always in as high health as possible, for such is the surest prevention of tuberculous disease.
As rot is hereditary,[41] the importance of weeding out ewes from the flock on their first exhibiting appearances of unsoundness, is acknowledged by all. Many ways have been pointed out for detecting the incipient symptoms, but none plainer and better than those written by the late Mr Beattie of Muckledale, and published in the 3d vol. of the _Highland Society's Transactions_. "The first thing to be observed," says Mr Beattie, "is in the spring, when they are dropping their lambs. A sound ewe, in good order, drops a lamb covered with a thick and yellow slime, which the ewe licks off it, and the rule is, the sounder and the higher the condition the ewe is in, the darker and thicker will be the slime; but when they observe a ewe drop a lamb covered with thin watery bubbles, and very white, they note her down as unsound."
[41] MM. Dupuy and Andral have seen tubercles in the foetus of the sheep.
"About the month of September, when they intend to dispose of their draught ewes, they put all their sheep into a fold, and draw them by the hand, that is, they catch them all, viz. the ewes they design to sell any of, and clapping their hand upon the small of the back, they rub the flesh backwards and forwards between their fingers and thumb and the ends of the short ribs: if the flesh be solid and firm, they consider her as sound; if they find it soft and flabby, and if, when they rub it against the short ribs, it ripples, as we term it, that is, a sort of crackling is perceived, as if there were water or blubber in it, they are certain she is unsound. This is the most certain of all symptoms, but is not to be discerned with any degree of certainty but by an experienced hand; for although, as I have here related it, it seems a very simple affair, and easily acquired, yet it is well known that many shepherds, who have followed sheep all their lives, never arrived at any thing like certainty in judging by the hand, whilst men of superior skill will seldom be mistaken, and will draw by no other rule. Yet still it must be acknowledged that the seeds of this disease will sometimes lie so occult, as to baffle all skill, and that no man can with absolute certainty draw a stock tainted with the rot. There is another method, to which men of inferior skill resort, which is more easily acquired. They take a sheep's head between their hands, and press down the eyelids, they thereby make the sheep turn its eyeball so that they get a view of the vessels in which the eyeball rolls: if these are thin, red, and free of matter, they consider the sheep as sound; but if they are thick, of a dead white colour, and seem as if there was some white matter in them, they are confident she is rotten. This is a pretty general rule, and easily discerned; but I think it is not so certain as when they are judged by the back; for in firm healthy lands the eye of a sheep is far redder than it is in sheep upon grassy lands. And in some boggy lands the eye is never very red, be the sheep ever so sound, so that there you cannot so well judge by the eye; but when you see the eye of a sheep a good deal whiter and thicker, and more matter in it (I mean the vessels in which the eyeball rolls) than the run of the flock amongst which it feeds, you have reason to suspect it is not sound.