680 EXPERIMENT STATION RECORD. 



The following conclusions are drawn from the study of all the data : 



" The amount of milk and butter fat produced depends upon the dairy capac- 

 ity of the animal and the amount and quality of the ration used. 



" Cows vary in their cost of keep, also in their ability to use economically the 

 food consumed. 



" Cows of a decided dairy type will return the greatest profit when fed to 

 their full capacity. 



"The avei-age cost of feeding a dairy cow, as shown by these records, is about 

 $30 per year,. and the total value of butter fat is about $70, leaving an average 

 of about $40 for labor and profit in addition to the value of the skim-milk and 

 the Value of the calf." 



Cost of producing milk, G. A. Billings {'New Jersey Stas. Rpt. 1906, pp. 

 298-304). — In ^ herd containing 35 cows one year and 34 the next the average 

 yearly production per cow for the' 2 years was 6,348 lbs. of milk, averaging 

 4.32 per cent fat, which would yield '320 lbs. of butter. The cost of feed per 

 cow averaged $46.10, making the cost of 100 lbs. of milk, not including that for 

 labor, 72.78 cts. At $1 per 100 lbs. for the milk the average return per cow 

 would be $17.29 for the year. At 18 cts. per pound for butter it would be 

 $11.41. Under these conditions the cow must produce 4,619 lbs. of milk, or 257 

 lbs. of butter, to pay for the food she eats. The only profit, if any, for labor 

 expended would be in the manure. The manurhU value of the feeds pur- 

 chased for these herds is computed. 



Maple Spring dairy, W. J. Fraser (Illinois Sta. Circ. 113, pp. 16, figs. 11). — 

 A popular account of the success achieved by a dairy farmer, cooperating to 

 some extent with the agricultural experiment station, in applying the scientific 

 principles of dairying in his actual farm practice. 



A city milk and cream contest, C. B. Lane and I. C. Weld ( U. S. Dept. Agr., 

 Bur. Anim. Indus. Circ. Ill, pp. 28). — The details are given of a contest among 

 a considerable number of dairymen in Cleveland, Ohio, in the production of 

 clean, wholesome milk and cx*eam, and also in the management of dairy farms. 

 This is believed to be a practical method of improving city milk supplies. 



The selection and milking of dairy cattle (Bd. Agr. and Fisheries [London], 

 Leaflet 187, pp. 8). — A summary of information for popular instruction. 



The dairy association and the eradication of tuberculosis of cattle, R. 

 OsTERTAG (Ztschr. Fleisch u. Milchhiig., 18 {1907), No. 2, pp. 41-50). —In 

 this paper, which was presented at the third international dairy congress at 

 The Hague, 1907, the extent to which dairy cattle are infected, the importance 

 of this fact to the dairy industry, and the methods for combating and eliminat- 

 ing the disease from the dairy herd are considered. 



Report of the experiment station and dairy institute at Kleinhof-Tapiau 

 in 1906-7, Hittciier {Ber. Vers. Stat. u. Lehranst. Molkw. Kleinhof-Tapiau, 

 1906-7, pp. 17). — Summaries are given of the activities of the institution in 

 various lines during the year. 



Dairy laboratory guide, C. W. Melick {Neiv York, 1907, pp. IV +129, figs. 

 52). — The author states that this manual is published for the benefit of dairy 

 short courses. It begins with the most elementary work, and touches only 

 the practical side with which every dairy or creamery operator should be 

 familiar. 



Practical dairy bacteriology, H. W. Conn {New York and London, 1907, pp. 

 XI+314, pi. 1, figs. 86). — This book is stated by the author to be designed for 

 dairy students and for all who are interested in dairy products from the stand- 

 point of their production, their distribution, or their consumption. It com- 

 bines the practical with the theoretical. The first and largest part of the 

 volume gives a general discussion of facts concerning the bacteria of milk 



