DAIRY FARMING — DAIRYING. 181 



oats, and peas. Each ration contained practically the same amount of protein 

 and carbohydrates. 



The average daily gain in weight per calf on the soiling crop ration was 

 1.32 lbs. per day and on the silage ration 1.33 lbs. It required 3.2 lbs. of 

 nutrients for 1 lb. of gain in the soiling crop ration and 3.4 lbs. in the silage 

 ration. 



The cost of feed for the station herd was $113.95 per cow last year and .$95.24 

 this year. It is estimated that only 47 per cent of the value of the milk has been 

 spent for feed. The cost of labor, bedding, stabling, etc., per cow per year is 

 estimated at $35.19. The total profit realized per cow per year was $52.19. 



Data on the cost of feed and other items for Holstein, Jersey, Guernsey, and 

 Ayrshire calves are given, also records and results of cow te.sting asssociation 

 work. In a study of these data as i-egards the relation of the amount of feed 

 fed and the cost of feed to the milk produced it was found that when silage is 

 used in the roughage ration the greatest profit over feed cost in proportion to 

 the amount of milk produced was received when practically the same amount of 

 dry matter was fed in the roughage in the grain, and where 1 lb. of dry matter 

 was fed in the total feed for approximately 1.2 lbs. of milk produced. When 

 the pounds of milk produced for each pound of dry matter fed in the roughage 

 exceeded 3 lbs. and the pounds of milk produced for each pound of dry matter 

 fed in the grain was below 2 lbs. the profit over feed cost was considerably 

 less in proportion to the milk produced. When the pounds of milk exceeded 

 4 for each pound of dry matter in the grain and were below 2.5 for each pound 

 of dry matter fed in the roughage there was also a decrease in the profit in pro- 

 portion to the amount of milk produced. 



Data are also given on the average production found per cow for 12 months 

 for each breed tested for advanced registry. The average cost of feed for a 

 7-day record was $4.11, estimated to be slightly above 50 per cent of the value 

 of the product ; the average cost of feed for the 30-day test was $15.92, slightly 

 less than 50 per cent of the value of the product. These figures indicate that 

 cows on advanced registry test are being much more economically fed than is 

 generally supposed. 



The average amount of feed consumed per cow for one year by the different 

 breeds is computed. The cost of this feed per cow for one year was as follows : 

 Guernsey, $103.14; Jersey, $77.77; Ayrshire, $184.33; Dutch Belted, $105.40; 

 and Brown Swiss, $131.13. 



Comparison of certain grain mixtures, H. E. Van Nokman and H. P. Davis 

 (Pennsylvania Sta. Rid. 1912, pp. 266, 267). — In an experiment to determine 

 whether there was any appreciable difference in milk yield due to the character 

 of the feeds, when so mixed as to have the same protein to energy ratio but 

 derived from different sources, six lots of three cows each were fed during three 

 periods of four weeks each by the reversal method three different grain mix- 

 tures having the same ratio of protein to energy. The greatest difference in 

 milk yield for the periods covered was 0.25 lb. of milk per cow per day, in the 

 next 0.11 lb., and in the third 0.05 lb. per cow per day. In other words, for all 

 practical purposes one mixture was as efficient as another in this experiment, so 

 far as milk yield was concerned, but thex*e was a marked difference in cost of 

 energy per 100 lbs. in the several mixtures. 



The least expensive mixture was corn and cob meal, cotton-seed meal, dis- 

 tillers' dried grains, and gluten feed 4.25 : 1 : 3 : 1, having a ratio of protein to 

 energy of 1 : 5 and costing per 100 lbs. of energy $1.79. 



The food requirements of milch cows in an open shed as compared with 

 regular stabling, H. E. Van Noeman and H. P. Davis {Pennsylvania Sta. Rpt. 



