CASEIN AND FAT.

Waipa Post, Volume I, Issue 47, 26 September 1911, Page 4

CASEIN AND FAT.

In milk of cows of different BREEDS. During the past two or three years the Ontario Agricultural College and Experiment Farm authorities have been investigating the relative amounts of casein and fat in the milk of cows belonging to different breeds. The following statements appear in their thirty-sixth annual report : “ The average number of milking days per cow during the period of testing was 221. The Ayrshires produced the greatest number of pounds of milk, fat, and casein. The highest average percentage of fat and casein in the milk by breedp was in that of the Jerseys. The average percentages of fat and casein for nine cows were respectively 3'96 and 2*38. “ The range in the percentages of fat and casein in individual cows' nnlk for the period of the test was from 3*41 to 4*BB for the fat and 1‘94 to 2*68 for the casein. None of the Ayrshires showed

such a wide variation in percentages of fat and casein in their milk as did cows representing the other two breeds.

“The percentages of fat and casein tend to increase quite markedly towards the end of the period of lactation. So far as we can judge from the data on hand, the feed does not appear to affect the percentages of fat and casein in milk. Lactation appear to be a more important factor than either feed or season of the year. “The Jerseys produced i'76lbs of fat for each pound of casein in the milk, or 's6lb of casein for each pound of fat. The Holsteins produced i'63lb of fat for each pound of fat. The Ayrshire produced i‘s9lb of fat for each pound of casein in the milk, or or '62lb of casein for each pound of fat in the milk.”