82 



Journal of Agricultural Research 



Vol. XVI, No. 3 



older than those without such records. This is no doubt due to the 

 progressive tendency to test young animals and to select animals for high 

 production. The animals whose total-solid records were determined are 

 found in the earlier herd books. 



It is interesting to compare these values with the milk of other breeds. 

 To facilitate this, Table II has been drawn up. The data for this table 

 have been gathered from many sources, chief among which are the papers 

 of the Agricultural Experiment Stations and the analyses of public 

 chemists. Each tabulated value is, in general, the mean of a considerable 

 number of observations and may be considered close to the true value. 

 Unfortunately it is not possible to obtain the original data so that the 

 other variation constants could be obtained. 



Table II. — Mean milk constituents of the different breeds c- 



Breed. 



Molltaler 



Blond vich 



Angler 



Jeverland 



Holland 



East Friesian. .. . 



Lova Rhine 



Breitenburg .... 

 Red Holstein . . . 

 Wesermarsch. . . . 



Schwyz 



Simmental 



Westerwold 



Glan 



Alderney 



Jersey 



Guernsey 



Holstein- Friesian 



Ayrshire 



Shorthorn 



Polled Jersey . . . 

 French Canadian 

 Dutch Belted. .. . 

 Brown Swiss. . . . 



Bed Polled 



South Devon . . . 



Kerries 



Dexter 



Holstein-Friesian 



Total 

 solids. 



Per cent. 

 13. 22 

 12. 75 

 12. 51 

 11.86 



II- 54 

 11.80 

 12. 12 



12.34 

 12. 07 

 11.85 



12. 76 

 13-27 

 12-99 

 13-57 



13. 60 



14-39 

 13. 61 



11. 78 



12. 46 

 12. 61 

 13-93 

 13-32 

 12.31 

 12. 61 



12. 66 

 12.93 



13. 10 

 12.58 

 12. 02 



Fat. 



Per cent. 



Ratio of 

 solids-uot- 



fatto 

 butter fat. 



2-43 

 2.48 

 2- 56 

 2.83 

 2- 63 

 2.81 



2.66 



2. 67 

 2. 69 

 6.65 

 2- 52 

 2. 28 

 2. 42 

 2. 26 



2-57 



1. 81 



2. 00 



2-55 



2.44 



2. 41 

 1.98 



2-33 



2. 62 



2-45 

 2. 47 

 2. 26 

 2- 63 

 2. 50 



the 



^_ "The references to the data combined in this table will be found in the following numbered papers of 

 "Literature Cited": 1, 7, 10, 12, 14, 19, 24, 30, 35, 36, 39, 40. 



These data are not entirely satisfactory, representing, as they do, data 

 collected under a great variety of conditions. This heterogeneity is un- 

 fortunate. Two errors are easily discernible : The fat percentage of the 

 Holstein-Friesian is about o. i per cent too low, and the fat percentage of 

 the Guernsey from unpublished data on 4,900 animals for a year's test 

 is 4.9 instead of the 4.53 of the above list. However, this is the only 



