1»17] DAIRY FAKMING — DAIRYING. 473 



energy remained practically unchanged but the amount of protein was reduced 

 from 10 to 12 per cent the rate of economy of gains was considerably de- 

 creased. A decrease was also observed where there was a change to a ration 

 in which the digestible dry substance, digestible protein, and energy were 

 slightly reduced. The substitution of the linseed meal in the fifth feeding period 

 materially increased the rate of gains and the economy of gains. 



" Steers which have been Itept on a low plane of nutrition (maintenance) 

 for a considerable time make more economical gains when put upon a full- 

 feed ration than steers which have been upon full feed for some time. How- 

 ever, steers receiving more than a maintenance but less than a full-feed ration 

 make no more economical gains when put upon full feed than steers which 

 have already been on full feed." 



The investigation indicates that "steers may be maintained or fattened with 

 the ordinary rations of the corn belt on less digestible dry matter, on less 

 digestible protein, and on less net energy than the amounts prescribed by the 

 generally accepted feeding standards." 



Information for horse breeders, L. L. Lewis and W. P. Shuleb {Oklahoma 

 Sta. Circ. J^S (1911), pp. 11, fig. 1). — This circular gives in concise form infor- 

 mation for persons engaged in horse raising. The topics discussed include 

 artificial insemination, some diseases of the reproductive organs of mares and 

 stallions, and the general care of mares and foals. 



Preserving egg's for the home, B. Aldee {Utah Sta. Circ. 25 {1917), pp. 8). — 

 This circular briefly reviews recent experiments on the preservation of eggs and 

 gives directions for the home preservation of eggs in limewater and water 

 glass. 



In tests at the station 12 doz. eggs were placed in a crock jar and covered 

 with a 10 per cent solution of water glass on April 1, 1913. During the follow- 

 ing winter some of these eggs were tested and found to be in very good con- 

 dition. Some of them were kept in the solution until the latter part of June, 

 1914, when most of the eggs retained a fairly fresh appearance as far as 

 ordinary observation could determine. There was no change in the size of the 

 air cell. 



In similar tests conducted more recently the quality of the eggs deteriorated 

 rather rapidly after about eight or ten months of storage. During the last 

 two years water glass and a patented preservative for coating eggs have been 

 compared. Good results were obtained with each method, but after five or six 

 months of storage the eggs preserved with the patented preservative deterio- 

 rated the more rapidly. 



DAIRY FARMING— DAIRYING. 



Selecting dairy bulls by performancs, W. E. Caeeoll (Utah Sta. Bui. 153 

 {1911), pp. 3-19, figs. S). — The author discusses the selection of dairy sires 

 by performance, which in the sense here used is meant the ability of the sire to 

 transmit to his daughters the potentiality of high milk and fat production. 



Results are given of a study of standards of measuring performance or com- 

 parative value of dairy bulls. The data reported consist of seven-day milk and 

 fat production records taken from the Holstein-Friesian Yearbook. Only bulls 

 having 50 or more A. R. O. daughters were considered. The 32 bulls whose 

 progeny were studied have to their credit a total of 2,.579 tested daughters and 

 1,0.52 proved sons, who in turn have 7,632 tested daughters, making a total of 

 10,211 individual milk-fat records, as every tested daughter of each bull wa.'^ 

 considered in the study. The records are classified by age groups, and they 

 show that these cows exceeded the present association age requirements by 



