DAIRY FARMING DAIRYING. 



673 



menls for maintenance of 0.63 lb the daily average protein content in 



the milk, 0.806 lb., being a return of 1 lb. of milk pi'otein to 1.38 lbs. of net 

 crude protein in the ration, with a daily yield of 4.645 lbs. of total product in 

 milk solids." 



Based upon these results a table has been calculated which gives the esti- 

 mated organic composition of milk for each 0.1 per cent increase in percentage 

 of fat from 2.5 to 7, and the net nutriment prescribed for production. The 

 following table is a contracted form of the complete table : 



Estimated composition of milk for each 0.5 per cent hwi-casc in fat content, and 

 net nutriment recommended for production. 



The standard for body maintenance proposed is 0.07 lb. of crude protein, 

 0.7 lb. of carbohydrates, and 0.01 lb. of ether extract per 100 lbs. in live weight. 

 The application of this standard to ration calculation is explained in full. 



The appendixes include tables on the composition of feeds used and milk 

 produced, and other data. 



Clover and corn silage as feeds for dairy cows, R. W. Clark (Montana 

 8ta. Bui. 9Jf (1913), pp. 33-5-^, figs. 3). — ^As an average of three experiments of 

 two periods each, and comparing clover hay and clover silage as feeds for dairy 

 cows, the average daily production of milk per head on clover hay was 22.8 

 lbs. and of fat 0.93 lb., while on clover silage the daily production of milk was 

 24.08 lbs. and of fat 0.97 lb. On clover hay the cost of producing 100 lb.s. of 

 milk was 73.9 cts. and of 1 lb. of fat 17.9 cts., while on clover silage the cost 

 of producing 100 lbs. of milk was 73.4 cts. and 1 lb. of fat 17.8 cts. It is 

 estimated that in milk production 2.33 lbs. of clover silage was required to 

 equal 1 lb. of good clover hay. 



The average value of clover silage for milk production is estimated at $2.55 

 per ton, of corn silage $2.38. Clover silage was relished by the cattle during the 

 winter months, but became dark in color, strong in odor, and was not relished 

 after the weather became wai'm. 



Experience elsewhere with clover silage is summarized, and brief descriptions 

 given of the silos at the station. 



On the possibility of increasing- the fat content of milk, Geumme (Ztschr. 

 Expt. Path. II. Ther., IJf (1914), No. 3, pp. 549-5-54; ahs. in ZcntU. Physiol., 28 

 (1914), ^0. 5, p. 286). — Three goats fed an ordinary ration produced during 

 four days an average of 2.97 kg. milk per day, testing 4.2 per cent fat, while 

 during three days fed a preparation, malt tropon, at the rate of 200 gm. per 

 animal per day, they averaged 3.5 kg. milk per day. testing 5.62 per cent fat. 



