This Appears To Depend A Good Deal Upon The
Position Of The Run And Its Nature.
Thus, a run situated in the plains
over which sheep are being constantly driven from the province of
Nelson, will be in more danger than one on the remoter regions of the
back country.
In Nelson there are few, if any, laws against
carelessness in respect of scab. In Canterbury the laws are very
stringent. Sheep have to be dipped three months before they quit
Nelson, and inspected and re-dipped (in tobacco water and sulphur) on
their entry into this province. Nevertheless, a single sheep may remain
infected, even after this second dipping. The scab may not be apparent,
but it may break out after having been a month or two in a latent state.
One sheep will infect others, and the whole mob will soon become
diseased; indeed, a mob is considered unsound, and compelled to be
dipped, if even a single scabby sheep have joined it. Dipping is an
expensive process, and if a man's sheep trespass on to his neighbour's
run he has to dip his neighbour's also. Moreover, scab may break out
just before or in mid-winter, when it is almost impossible, on the
plains, to get firewood sufficient to boil the water and tobacco (sheep
must be dipped whilst the liquid is at a temperature of not less than 90
degrees), and when the severity of the sou'-westers renders it nearly
certain that a good few sheep will be lost.
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