310 



SWINE IN AMERICA 



the main feeds are not easily available, are treated at 

 greater length in other chapters of this volume. 



RESULTS IN FEEDING 



Study and comparison of the weights of pigs at va- 

 rious ages, and the quantity of feed consumed and gains 

 made under ordinary conditions, are of no value to the 

 feeder. Averages of this character have been carefully 

 made up by Professor Henry from his experiments at 

 the Wisconsin station and from records reported from 

 many trials at other state stations. He gives the fol- 

 lowing table regarding the average birth weight and 

 weekly gains made by pigs before and after weaning: 



WEIGHTS AND GAINS MADE BY PIGS^ BEFORE AND AFTER 



WEANING, WISCONSIN STATION 



before weaning, 10 weeks, average 

 of 12 litters, 86 pigs. 



Gain. 

 Pounds. 



1.9 

 2.6 

 2.8 

 2.7 

 3.1 

 3.0 

 4.0 

 5.2 

 5.3 

 5.4 



After weaning, 7 weeks, average 

 of 8 litters, 62 pigs. 



10th week, 

 nth week. 

 12th week. 

 13th week. 

 14th week. 

 15th week. 

 16th week. 

 17th week. 



Average | 

 weight. Gain. 



Pounds. I Pounds 



41.5 

 46.7 

 52.0 

 58.3 

 64.2 

 69.8 

 76.5 

 84.1 



5.2 

 5.3 

 6.3 

 5.9 

 5.6 

 6.7 

 7.6 



In commenting on these averages, Professor Henry 

 said : "The heaviest pig in these litters weighed 3.6 

 pounds at birth and tlic lightest 1.6 pounds, the average 



