. Journal of agricultural research . 11 13 15 17 19 21 23 25 27 29 MEAN WEEKLY YIELD - GALLONS FlC. a.—Histograms and fitted curves for variation in mean weekly milk yield of Ayrshire cows of ages 8 to 12 years. 3o8 Journal of Agricultural Research voi. xvn, Fig. 3.—Histograms and fitted curves for variation in fat percentage of milk of Ayrshire cows of ages3 to 7 years. For purposes of illustration the 1909 curves are used in the 3- and 4-year classes. Sept. IS. 1919 Variation in Milk of Ayrshire Cows 309

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913