ORIGIN AND IMPROVEMENT OF OUR DOMESTIC PIGS. 43 



twenty or thirty years. The sow breeds only once a year, 

 and has seldom more than five or six at a litter ; suckles 



3. WILD BOAK. 



them three or four months, and does not allow them to 

 leave her until they are two or three years old, and able 



Fig. 4. ORIGINAL OLD ENGLISH PIG. 



to defend themselves. Occasionally they grow to a great 

 size, but usually they are not as large as the domestic pig. 



