1891.] PUBLIC DOCUMENT — No. 33. 43 



The results of the last experiment lead tc similar con- 

 clusions as our preceding experiments in 1887, 1888 and 

 1889, with green vetch, green Southern cow-pea, green 

 serradella and mixed green crops of vetch and oats and vetch 

 and barley. (See Report seven, page 50.) 



Conclusions of IS 90. 



1. The amount of dry matter in the feed consumed dur- 

 ing different feeding periods for the production of one quart 

 of milk obtained, varied from 3.32 to 3.55 pounds in case of 

 a daily milk production of from 7 to 8 quarts (Jessie) ; it 

 varied from 2.62 to 2.99 pounds (Pink), when from 9 to 10 

 quarts was the daily production of milk ; and it was from 

 1.69 to 1.75 pounds per quart of milk produced when the 

 yield rose to from 13 to 14 quarts (Pearl). The variations 

 in the numerical relation of the amount of dry matter of the 

 feed consumed for the production of one quart of milk, in 

 case of the same animal and the same kind of feed, are 

 materially due to a more or less advanced stage of tlie milk- 

 ing period of the animal on trial ; yet they rarely correspond 

 in different animals. Constitutional differences quite fre- 

 quently modify the results under otherwise corresponding 

 conditions. 



2. The total cost of the feed consumed in connection 

 with the production of one quart of milk differed during the 

 same feeding period, in case of different animals, from 1.69 

 cents to 3.43 cents ; 1.69 cents in case of Pearl and 3.43 

 cents in case of Jessie, second feeding period, — soja beans. 

 This difference is mainly due to the rate of the daily yield 

 of milk ; yet constitutional peculiarities sometimes affect 

 materially the final results. 



3. The net cost of the feed consumed for the production 

 of one quart of milk varied in case of different cows from 

 0.93 cents to 1.88 cents; Pearl 0.93 cents and Jessie 1.88 

 cents, second period, — soja-bean ration. 



4. The market value of the obtainable manurial refuse 

 amounts per quart of milk produced on an average to more 

 than three-sevenths part of the entire cost of the daily 

 fodder ration. Net cost of feed represents the money value 

 of the feed after 80 per cent, of the manurial value of the 



