1916] 



DAIBY FARMING — DAIRYING- 



873 



The results of an experiment with nine cows to determine the eCFect that 

 dipping has on milk flow are shown in the following table: 



Effect of dipping on milk floic of nine cows. 



" Indicates increase. 



Does it pay to talsie extra care of cows? C. C. Hayden {Mo. Bui. Ohio Sta., 

 1 (1916), No. S, pp. 2^5-248, figs. 2).— Two cows of the station lierd were put 

 under official test conditions for one year. As compared with their previous 

 treatment they were given better care and extra feed, and for a part of the 

 year they were milked three times daily. Under these conditions the first cow, 

 during her fifth lactation period, produced 14,722 lbs. of milk and 400 lbs. of 

 fat, whereas her average production during the first four lactation periods was 

 8,194 lbs. of milk and 239 lbs. of fat. The production of the other cow during 

 the test, which was her sixth lactation period, was IS.olS lbs. of milk and 505 

 lbs. of fat, whereas her average producton during the first five lactation periods 

 ■was 8,195 lbs. of milk and 280 lbs. of fat. In these records one year from the 

 birth of each half was taken as the lactation period. 



For the first cow the feed cost during the test was 78 cts. per 100 lbs. of milk 

 and 20 cts. per pound of fat. During her four previous lactation periods the 

 average cost of feed on the same price basis was 89 cts. per 100 lbs. of milk and 

 22 cts. per pound of fat. For the second cow the corresponding feed costs during 

 the test were 85 cts. and 18.5 cts., and for the first five lactation periods 86 cts. 

 and 18 cts., respectively. For the first cow during the year of the test the total 

 cost ^^ as $1.23 per 100 lbs. of milk and 36 cts. per pound of fat, and for the four 

 previous years on the same basis $1.57 per 100 lbs. of milk and 45.7 cts. per 

 pound of fat. For the second cow the total cost during the test was $1.28 per 

 100 lbs. of milk and 31.6 cts. per pound of fat, and for the five previous lactation 

 periods $1.54 per 100 lbs. of milk and 38 cts. per pound of fat. 



Digest and copy of law regulating the weighing, testing, and purchasing 

 of milk and cream, W. J. Carson (New Jersey Stas. Circ. 62 (1916), pp. S-16). — 

 In addition to a digest and copy of the law regulating the weighing, testing, and 

 purchasing of milk and cream, the author gives the rules and regulations of the 

 station for its enforcement and a list of creameries in New Jersey. 



Cream testing balances, O. F. Hlnziker, G. Spitzek, and G. L. Ogle (Indiana 

 Sta. Bui. 189 (1916), pp. 19, figs. 17). — This bulletin presents data concerning 

 the desirability, efficiency, and accuracy of the various types of balances com- 

 mercially used in the testing of cream for milk fat, outlines notes on their con- 

 dition, care, and manipulation, and gives specifications and tolerances estab- 

 lished by the United States Bureau of Standards for standard cream test bal- 

 ances. 



The results of the inspection by the station of 193 balances showed that the 

 sensibility reciprocal, which, as defined by the Bureau of Standards, is the 

 weight required to move the position of equilibrium of the pointer or other indi- 

 cating device of the balance an amount equal to one division on the graduated 

 scale or arc, averaged 0.0607 gm. with the balances loaded to full capacity and 

 C.0527 gm. when the balances were without load. The difference in the sensi- 



