1920] DAIRY FARMING DAIRYING. 873 



for shape. The color of the egg laid by a pullet was found to be useless as 

 an inditatiou of the color of the eggs laid by the chick hutched from it, but 

 the color of the egg of an older bird was slightly correlated with the coloi- 

 life mean of tho h:ilched chick. 



Report on the ninth V^ictorian egg-laying competition, A. V. D. Kjntoui. 

 (Jour. Dept. Agr. Yictoria, 18 {1920), No. 6, pp. S.il-350, fiys. 20).— This is a 

 report of the egg-laying contest held at Burnley, Victoria, during the year 

 ended March 31, 1920. It differs from report.^ of preceding contests (E. S. R.. 

 42, p. 874) in that only yearly totals are given. During this contest the birds 

 in the group pens were trap-nested, but there were a considerable number of 

 tloor eggs. 



Discussions of egg packing and the utility of type of Black Orpington are 

 included. 



Care and management of rabbits, C. C. Sherlock (Philddelphia: David 

 McKay Co., 1920. pp. 253, pis. 6, figs. //). — The author discusst-s in ccnisidcrable 

 detail the breeding, housing, and hygiene of rabbits and devotes particular at- 

 tention to rabbits as meat and fur animals. 



Rabbit breeding, V. Foktiek {Canada Expt. Farms Bui. 34, 2. ser. {1918). 

 [French ed.], pp. ^8, figs. 18). — This bulletin is designed as a manual for per- 

 sons engaged in raising rabbits for skins. Among the topics discussed are 

 breeds, breeding, feeding, housing (including plans for cages), castration, prep- 

 aration of skins, and diseases. 



DAIRY FARMING— DAIRYING. 



Relative values of feed proteins for dairy cows, C. Laksen, T. H. Wright, 

 JR., H. il. Jones. H. Hoover, and B. L. Johnson {South Dakota Sta. Bui. 188 

 {1920), pp. 163-204). — The authors report two series of balance experiments 

 with dairy cows to compare the utilization of proteins derived from linseed 

 meal and gluten feed. The first series involved 3 cows and was continued 

 through six 10-day periods in 1917. The second was begun l.ite in 1918 and 

 involved 4 cows during 4 periods. The successive periods were separated by 

 5-day transition periods. The roughage ration during the first series consisted 

 of 30 lbs. of corn silage and from 12 to 17 lbs. of prairie hay, and during the 

 second series 20 lbs. of silage and from 20 to 24 lbs. of prairie hay. Only the 

 roughages were supplied in the first period of each series and the nitrogen balance 

 in every case was negative. In the subsequent periods of series 1 and in periods 

 2 and 3 of series 2, either linseed meal or gluten feed was furnished in amounts 

 that were expected to overcome the negative balance, but positive balances were 

 not realized in all cases. The cows used in series 1 weighed ],1.~)3. 1,378, and 

 1,040 lbs., respectively, at the beginning of the first period, while those in the 

 second series weighed 1,048, 830, 936, and 864 when the experiment began. The 

 complete results are presented in 26 pages of tabular matter, together with a 

 brief discussion and a review of the literature. 



Two methods were employed to compute the relative utilization of the nitrogen 

 furnished. By one method — a modification of the procedure of K. Thoma.s — the 

 increase of body nitrogen during a period of concentrate feeding in comparison 

 with the period on roughage alone is expressed as a percentage of the increased 

 amount of nitrogen available for storage and katabollsni. By the second method 

 the increase of nitrogen utilized for milk production and body storage Is ex- 

 pressed as a percentage of the increase of nitrogen tligested. A summary of the 

 data computed according to the second method appears in the following table: 



Ik 



