336 EXPERIMENT STATION RECORD. 



milk containing a lower percentage of solids, solids-not-fat, and fat than wlieal- bran ; 

 wheat bran produced milk containing a higher percentage of solids and fat and a 

 lower percentage of solids-not-fat than linseed meal." 



For tlie solicLs-uot-fat the results were less nuiform and the changes 

 less marked. 



Considering the effect of the different rations on the yield of milk 

 and milk fat, the author says : 



"These results do not show any material difiereuce in the influence of the 3 con. 

 centrated feeds on the production of milk and fat Tinder the conditions present in 

 this experiment. Linseed meal gives a slightly better result than corn meal or 

 wheat bran, and the latter 2 feeds give practically the same results, the main 

 difference lying in the somewhat higher fat content of the milk on the bran feeding." 



Microscopic examinations of the milk were made during the first 3 

 days of the first and fourth weeks of each period. The globules in 

 0.0001 cmm. and their relative size were determined. " The results would 

 indicate that both wheat bran and linseed meal have a tendencj^ to 

 increase the size of the fat globules in cows' milk.'' 



The following general conclusions are drawn: 



"The data given show that under the conditions present in this experiment there 

 was practically no difl'erence in the immediate effect of the corn meal and the wheat 

 bran on the yield of the milk, and that there was a small difference in favor of the 

 linseed meal ; as regards the production of fat, both linseed meal and bran give better 

 results than corn meal, neither of these differences being, however, very marked. 



"The jilan of the experiment precludes a study of the effect of these foods beyond 

 the time when they were fed.'' 



The results are also discussed from a pecuniary standpoint, and the 

 opinions of other investigators regarding linseed meal are quoted. 

 The author believes that under the conditions ordinarily existing in the 

 State linseed meal should only be fed in small quantities to cows, 

 the bulk of the grain ration being made up of cheaper grains or refuse 

 products from them. 



Tests of dairy co-ws, J. W. Becker, ( Wisconsin Sta. Bjjt. 1891, pp. 

 205-319). — During 4 years the station nmde over 90 tests of cows, lasting 

 from 1 to 7 days, for breeders and agricultural associations. The results 

 of these tests are grouped in different ways and discussed: 



" [In regard to the effect of age upon the quality of milk] the iuference is that 

 the diffei'ence between different ages is very small, if, indeed, there is any at all. 

 In some cases where the same cow has been tested at different ages there is found a 

 considerable difference in the percentage of Ait in the milk, but the richer inilk is 

 sometimes found in the first and sometimes in the second test. If in such cases the 

 influence of advancing lactation in improving the quality of milk is considered, 

 most of the difference will disappear." 



The record is given of 1 Jersey cow tested morning and night for o 

 days, which showed wide variation : 



"During the second day she gave 2^ times as much fat as upon the first day, 

 although the quantity of milk was increased ouly one-third. The greatest difl'erence 

 between any two railkings was found on the evening of the first day and tlu^ next 

 morning, where the difl'erence amounted to 5.8 jier cent fat." 



