SHEEP EAISIXG FOR BEGINNERS. 
21 
by the parasites is most easily shoAvn in the white paperlike appear- 
ance of the skin and membranes of the mouth and eyes, while watery 
swellings often develop under the jaws. 
Treatment of infected lambs will bring about recovery if given in 
time, although, as before indicated, the safest and cheapest way of 
combating the trouble is by preventing it. Young lambs_ are very 
unlikely to become seriously infected by larvie from eggs dropped by 
older sheep in barns or yards bare of grass. On a noninfected 
pasture the larvae will not ordinarily develop in any considerable 
numbers to the stage which will result in injury in less than 10 
days or two Aveeks. If the flock is moved to fresh noninfected 
ground by that time, the danger is avoided for a further period of 
the same length. 
It is not known how long larvae of this parasite will continue to 
be dangerous, but, since freezing commonl}^ kills unhatched eggs, a 
pasture in cold climates that Avas not used in summer and fall until 
after frost will be practically safe for occupancy by lambs for a 
limited time the following spring or summer, provided the old 
sheep are removed from it before the winter is over. This fact, and 
the desirability of obtaining the maximum amount of grazing from 
small areas, thereby reducing the amount of fencing needed, makes 
it advisable to adopt the plan of having a rotation of forage crops 
for summer use. Land on which fall wheat or rye has been sown 
will be safe for spring use and, if plowed and sown to rape or other 
crops for later grazing, is then also free from serious stomach-worm 
infection. 
On farms where sheep have not been previously kept trouble from 
stomach worms is not likely to be serious until the second or third 
summer. 
Fig. 6. — A flock of lambs on the way to be loaded on cars for shipment to market. 
These lambs are the combined lots of several members of a Tennessee shipping 
club. 
