Milk and Butter Yields of Heifers Com- 
pared with Mature Cows. 
BYe Col. BEACH, 
In Table No. 1 may be found the results of 3098 official 
milk and butter-fat records of Holstein-Friesian cows and 
heifers, published in Vol. 4 of the Year Book, and classified 
and averaged according to age. Several points of interest to 
students of dairy animals are exhibited in this compilation. 
1. The quality of milk is quite uniform for animals of dii- 
ferent ages. The milk of two-year-old heifers contained .2% 
(2-10) less of butter-fat than that of cows in the mature five- 
year-old form. 
2. , The calculated butter-fat yield at even age of two years 
is 9.05 pounds of butter-fat, and 14.35 pounds of butter-fat in 
seven days at even age of five years. From this it would 
appear that a heifer at two years of age may be expected to 
TAaprE MNo. 4 
Milk and Butter Vields Holstcin-Friesian Cows, Vol. 4, 




Year Book. 
Average Age of Cows No. of | Average Fat |Average Milk |Per Cent. of 
Years Months Days Records | Yield pounds Yield, pounds] Fat in Milk 
Tet 14 35 15.40 445.2 3.46 
9 to 10 rei 14.97 433.2 3.45 
8 to 9 Pie LOtL7 441.6 3.44 
THO eS 187 14.71 438.2 3.36 
Biton: sy 207 Lose 441.9 3.405 
o 5 20 281 14.72 432.7 3.406 
4 5 15 452 13.96 416.5 3. B02 
3 5 15 665 a AO 3€8.6 3.362 
2 Amel S10 823 9.96 300.9 SHOT 
] - $10} 15 265 8.76 267-53 ee Ws 








Calculated Yield at Even Age. 
