EXPERIMENT STATION BULLETINS. 



549 



Sheep pasturing on low lands and drinking from stagnant pools, often 

 develop lung worms. Lung worms are light colored, thread-like worms 

 that feed on the lining of the tubes to the lungs. As they increase in 

 numbers, they lie in clusters in the tubes, shutting off the circulation of 

 air. 



No successful practical treatment has been found. The best method 

 is to send to market all weak sheep and those with a hacking cough and 

 keep the balance of the flock on well-drained pasture where there is no 

 stagnant water. 



HOGS. 



The census report for 1920 gives the number of hogs in the Upper 

 Peninsula as 22,502, with a total valuation of f 448,551.00. 



Both the lard type and the bacon type hogs are well adapted to this 



Fig. 34. A promising group of Yorkshire pigs on a farm near Stephenson, Menominee County. 



section. The best system in most sections of the Upper Peninsula is to 

 produce one litter per year and that in the spring. The most satisfactory 

 way is to run the pigs on pasture with a little grain during the summer 

 months and finish them on full feed of grain. Barley and field peas 

 are excellent finishing feeds for use after the pasture season is over. 

 On farms that have good housing conditions for the pigs, and that raise 

 plenty of grain for feed and have plenty of skim milk, the fall litters 

 can be developed successfully. On every farm where either clover pasture 

 or skim milk is available, a few pigs will help increase the family income. 



HORSES. 



Tliere were 25,069 horses in the Upper Peninsula in 1920, valued at 

 13,915,404.00, according to the census report. These are principally of 

 two types : the light draft, weighing from 1,350 to 1,500 pounds and the 



