Sept. IS. 1919 Variation in Milk of Ayrshire Cows 



309 



27 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5J 



FAT PERCENTAGE 



Fig. 4.— Histograms and fitted curves for variatioa in fat percentage of milk of Ayrshire cows of ages 



8 to 12 years. 



