FOOD EFFECT ON MILK SECRETION. 219 



values of fodders and the products formed, or between the albuminoids 

 of the food and the casein in the milk. 1 



CHANGING FEEDS. The final results in changing food showed that there 

 was little change in the total fat produced, as change in quality was com- 

 pensated for by quantity. 2 



DIET. The influence of a certain diet may have a widely different 

 effect on different animals. 3 No relation was found to exist between foods 

 and volatile fatty acids, except in the case of skim milk. 4 



NARROW AND WIDE RATIONS. Two rations containing approximately 

 the same quantity of digestible matter, one narrow and the other wide, 

 gave from 20 to 36 per cent, more milk on the narrow, and from 30 to 40 

 per cent, higher total solids on the narrow, than on the wider rations. In 

 the experiment three cows were used for three periods of thirty-five days 

 each. The wide ration was 1 to 12:3: the narrow ration 1 to 6.7. 5 



Rations may have equal digestible constituents, but be derived from 

 different sources, as follows: Ration L Rati(m n 



Timothy hay 5 15 



Corn silage 40 25 



Oats ground 5 



Peas ground 6 



Malt sprouts., 2 



Brewers grains dried 3 



Buffalo gluten feed 3 



Ration No. 1 is supposed to have the larger proportion of easily digestible 

 carbohydrates, but it had no advantage over No. 2 in milk production. 6 



The effect of widening a nutritive ratio from 1:5 to 1:9, and from 

 1 :5.6 to 1 :8 was to cause a decrease of from 8 to 13 per cent, in the flow. 7 With 

 the same cows hardness depends more upon the character of the feed than 

 upon the nutritive ratio. 8 



While the foregoing experiments are typical of the work done to de- 

 termine the effect of food upon the quantity and quality of milk, they 



1 Report of Vermont Agr. Exp. Station, 1889. J. L Hills. 



2 Bulletin 30, Nebraska Agr. Station. C. L. Ingersoll and H. B. 



Duncanson.. 



3 Report of Mass. Agr. Exp. Sta., 1888. 



4 Bulletin 13, New Hampshire Agr. Exp. Sta. A. H. Wood and C. L. 



Parsons. 



5 Report of Maine Agr. Exp. Station, 1893. W. H. Jordan. 



6 Bulletin 141, New York Agr. Exp. Station. W. H. Jordan and C. G 



Jenter. 



7 Bulletin 9, New Hampshire Agr. Exp. Station. G. H. Whitcher. 



8 Bulletin 13, New Hampshire Agr. Exp. Station. A. H. Wood and 



C. L. Parsons. 



