684 EXPERIMENT STATION RECORD. [Vol. 37 



The average weights at one day of age of calves born In the university herd 

 are classified according to breed and sex as follows, the first figure under each 

 breed being for females and the second for males : Jersey 59.7 and 62.4. Guern- 

 sey 68.8 and 70, Ayrshire 71.4 and 77.7, and Holstein 88 and 90 lbs. At the 

 station a group of 20 Holstein heifers from birth to one year of age consumed 

 244 lbs. of whole milk, 860 lbs. of skim milk, 1,107 lbs. of grain, 1,067 lbs. of 

 hay, and 1,669 lbs. of silage per head. These heifers averaged 92 lbs. at birth 

 and 532 lbs. at one year and made an average dally gain of 1.2 lbs. 



Selecting rations for dairy cows, G. C. White and K. B. Musses {Connecti- 

 cut Storrs Sta. Bui. 90 (1917), pp. 5-58). — The requirements to be considered in 

 formulating dairy rations are discussed and tables are given showing the char- 

 acteristics of some common feeds ; the nutrients required by dairy cows for 

 maintenance and milk production ; the digestible nutrients, fertilizing constitu- 

 ents, and value of fee<ling stuffs ; the average wholesale prices for 13 years of 

 feeding stuffs in carload lots at Boston points; high and low prices of some com- 

 mon feeds by months for five years; cost per hundredweight of digestible nutri- 

 ents at different prices for feeds, etc. Full directions are given for selecting 

 and compounding rations, and suggestions are offered for analyzing the feed 

 market 



Dairy feeding: and tii« calculation of rations, L. S. Riford {New Jertey 

 Stas. Circ. 75 {1911), pp. 15). — This circular explains briefly some common 

 feeding terms, gives directions for the use of the feeding standard, and offers 

 suggestions for the purchase of concentrates and the use of home-grown feeds. 



Dairy herd [record], J. M. Scott {Florida Sta. Rpt. 1916, pp. 11,-11, figs. 5). — 

 Tables show the calving record, age and breed of cows, time in milk, milk and 

 fat production records, and cost data of the station dairy herd during the fiscal 

 year. Of 19 pure-bred and grade Jerseys being mllke<l during the year, the 

 highest yield was 5.907.7 lbs. of milk and 300.75 lbs. of fat. The cost of feed 

 for this cow was $94.86. Valuing butter at 40 cts. per pound and milk at 32 

 cts. per gallon, she returned a profit of $124.95 over cost of feed. 



Germ content of milk. — I, As influenced by the factors at the bam, M. J. 

 Prucha and H. M. Weeteb {lUiuois Sta. Bui. 199 (1917). pp. 25-51, figs. 5).— 

 The Investigation here reported is a part of that begun by Harding et al. (E. 

 S. R., 29. p. 878). Its purpose was to measure the collective influence of all 

 the barn conditions and operations upon the germ content of the milk produced 

 therein. The data were obtained In three dairy barns during the years 1914 

 and 1915. A description is given together with an Illustration of the interior 

 of each of the barns. The three barns " in a general way represent three 

 classes of dairy barns, barn 1 being in excellent condition, barn 2 being good, 

 and barn 3 poor. The difference between barns 1 and 2 as to cleanliness, 

 however, was not very great. On the other hand, bam 3 would be classed as 

 a dirty barn." 



The utensils used were thoroughly steamed before each milking. In 1914 

 the udders of all the cows were wiped with a damp cloth previous to each 

 milking, but In 1915 this practice was discontinued. All samples were taken 

 from the milk of the individual cows when the milker brought it in palls from 

 the barn Into the adjacent milk room. The bacteriological examination of the 

 milk was made by the plate method. In order to ascertain the extent of varia- 

 tion in bacterial count due to the laboratory methods employed, ten experi- 

 ments were undertaken in each of which 100 plates were seeded with the same 

 milk. None of the individual counts varied much more than 25 per cent from 

 the average. 



A total of 1,665 samples were taken from 138 cows. Data from the analyses 

 of these samples are tabulated. Among the samples from barn 1 the lowest 



