650 
Journal of Agricultural Research 
Vol. XI, No. 12 
individuals of each breed showed the highest fat test in each lactation 
period. This frequency, calculated as the percentage of cows of each 
group showing the highest test for each period, is presented for each 
breed in Table II. The combined data for each breed are shown graphi¬ 
cally for a portion of the cows in figures 1,2, and 3. 
Table I .—Percentage of fat in milk in successive lactation periods 
JERSEY COWS 
Period- 
Number of cows. 
74 
59 
45 
3 ° 
20, 
11 
4. 
3 * 
3 * 
2. , 
2., 
I 
2 
3 
4 
4.99 
4.96 
5*04 
5*04 
5 * °i 
4. 84 
4-95 
5*04 
5 * °3 
5 - °9 
5 * i 7 
5* 20 
4*97 
5-09 
5. 20 
5* 22 
4.92 
4*93 
5.00 
5 * °9 
4. 80 
4.89 
4 * 9 ° 
5 * 05 
4.68 
4* 86 
4.83 
4.83 
4 * 47 
4. 86 
4*83 
4*83 
4*47 
4*99 
4 * 9 ° 
4*75 
4 - 5 ° 
4*99 
4.90 
4*75 
4 * 5 ° 
5 
6 
7 
i 
8 
9 1 10 
11 
i 
12 
j 
5. °o 
4 * 92 
4 * 76 
4 * 54 
4 * 56 
4 * 56 
4.44 
4 * 44 
4 * 76 
4. 68 
4. 68 
4.64 
4.64 
4 * 76 
4 * 76 
4* 63 
4. 61 
4. 62 
4. 62 
4. 70 
4 * 70 
4 - 58 
4.48 
4.48 
4. 48 
4.48 
4*47 
4 * 47 
4*49 
4*49 
4. 22 
4*33 
4*33 
4. 22 
4. 22 
4. 01 
HOLSTEIN COWS 
26. 
3. 22 
3 * 23 
3* 26 
3*27 
3 * 36 
3 * 33 
3 * 29 
3 * 10 
3. 06 
3 - o$ 
3.04 
3 * 07 
3.06 
2*99 
20. 
3*09 
3* 12 
3.06 
3 * 15 
3 -n 
3*03 
. 
11. 
3 * 
3 * 12 
3. 16 
3 * 11 
3.08 
8. 
3*03 
3 * 10 
3* 06 
3*09 
6. 
3 * 4 i 
3 * 18 
3 * 05 
3 * 11 
3* 00 
V/ 
I... 
2. 88 
AYRSHIRE COWS 
3 * 90 
3 * 90 
4.04 
4. 01 
’4.06 
4. 10 
4. 10 
4 * 10 
3* 88 
3* 88 
3 * 92 
3 * 97 
4. 08 
3*90 
3 * 9 ° 
3*90 
3 - 79 
3. 81 
3 - 78 
3 - 79 
3-87 
3-87 
3-87 
6. 
3* 64 
3*68 
3 * 83 
3*99 
3*99 
3 - 99 
4. 
3* 82 
3-84 
3 - 87 
3-87 
3 - 87 
3 - 79 
3 - 76 
3 - 76 
3 - 76 
3 - 6S 
3 - 6S 
3 - 65 
3-38 
3 - 38 
1. 
3 - 58 
ALL COWS 
109 . 
4.48 
4-45 
4 - 56 
4.64 
4-65 
4.42 
4.46 
4.67 
4.86 
4-99 
4-99 
4.48 
4 - 47 
4 S 8 
4 - 65 
4 . 66 
4-36 
4 . 42 
4 . 60 
4*83 
4 * 9 ° 
4.90 
• j ' ' | 
88 . 
4-45 
4 - 58 
4 . 66 
4.67 
4.44 
4 - 5 2 
4-59 
4-83 
4 - 75 
4 - 75 
1 ! 
62 . 
4 . 41 
4.49 
4 . 47 
4*25 
4*30 
4*35 
4*47 
4 * 50 
4 * 5 ° 
42 .. 
4 * 51 
4 * 45 
4 . 21 
4 * 19 
4*44 
4 * 56 
4*44 
4*44 
i. 
28 . 
4*36 
4 . 18 
4 . 26 
4.42 
4.64 
4 * 76 
4 * 7<5 
1 
17 . 
4 * 13 
4 . 14 
4 * 38 
4 . 62 
4 * 7 ® 
4 * 70 
6 . 
4 . 10 
4 . 21 
4 * 48 
4.48 
4 . 48 
4*25 
4 * 47 
4.49 
4*49 
4 . 22 
4*33 
4 * 33 
0 
2 . 
4 . 22 
4 . 22 
2 . 
4 . 01 
