10(5 AGRICULTURAL EXPERIMENT STATION. [Jan. 



3. Twelfth Feeding Experiment with Pigs. 



Breed, medium Yorkshire, grade Chester White; feed, skim- 

 milk, corn and cob meal, wheat bran, gluten meal ; time, April 

 22 to Sept. 1, 1890. 



Eight pigs, four medium Yorkshires and four grade 

 Chester Whites, were secured for the trial. Each lot con- 

 sisted of two sows and two barrows. The individual live 

 weight of the medium Yorkshires varied from 30 to 37 

 pounds, and that of the grade Chester Whites from 28.75 

 to 33 pounds, at the beginning of the observation. The feed- 

 ing began April 22 and closed September 1, thus covering a 

 period of 133 days. 



The general course pursued in the management of the 

 experiment is materially the same as adopted in the preced- 

 ing VII., Vm., IX., X., XI. The main alteration consists 

 in the substitution of corn and cob meal in place of the corn 

 meal. The amount of skim-milk consumed daily per head 

 remained practically the same, after the first week, — four 

 quarts. To every quart of milk required were added two 

 ounces of corn and cob meal. The additional feed subse- 

 quently needed consisted of a mixture of two weight parts 

 of gluten meal and one of wheat bran. At the close of 

 the second month of our trial, when the live weights of the 

 various animals amounted to from 120 to 130 pounds each, 

 the diet was changed ; a mixture of four weight parts of 

 corn and cob meal and one weight part each of gluten meal 

 and wheat bran was fed with the original quantity of skim- 

 milk, — four quarts daily per head. The subsequent tabular 

 statement shows the changes in the nutritive character of the 

 feed at different stages of growth. The entire experiment 

 might be divided practically into three feeding periods : — 



Live Weight. 



Nutritive 

 Ratio. 



Period I., . 

 Period II., . 

 Period III., . 



20 to 90 pounds. 



90 to 130 pounds. 



130 to 200 pounds. 



1:2.83 

 1:3.60 

 1:4.25 



