110 



Pork Production 



TABLE XXIII. EFFECT OF AGE OF Sow ON BIRTH WEIGHT 



OF PIGS 



Cross-breeding. 



As shown in Table XXIV, cross-bred pigs appear to 

 have a heavier birth weight than do pure-breds. In this 

 table the average birth weight of pure-bred pigs is com- 

 pared with that for cross-bred pigs produced by the 

 same sows. Although a larger proportion of the cross- 

 bred pigs were produced by mature sows, the difference 

 shown is suggestive. The method of feeding the sows 

 during pregnancy was the same throughout the years in 

 which the records were taken. (See Chapter III, page 42.) 



TABLE XXIV. EFFECT OF CROSSING ON BIRTH WEIGHT 

 OF PIGS 



