The teachings of some of our prominent agricultural chemists upon this subject— teachings which have received wide circulation only so recently that they will be new to most of our readers— may be stated as follows:
First, In general— that while quantity of milk is largely dependent upon the kind of feed consumed, quality (i. e. composition) is almost independent of it; in other words that the quality of milk cannot be materially changed by varying the kind or composition of the feed.
Second, In detail— that neither the percentage of fat nor o f total solids in the milk is materially influenced by the kind or the composition of feed consumed; that these percentages are fixed by the constitution or individuality of each animal, and so firmly fixed that to change them to any considerable extent and for any length of time, by feeding, is impossible.
Wilson, James; Patrick, G. E.; Kent, D. A.; and Curtiss, C. F.
"Effect of feed upon the quality of milk,"
Bulletin: Vol. 2
, Article 2.
Available at: https://lib.dr.iastate.edu/bulletin/vol2/iss14/2