64 Bulletin 152. 



contained as a three-year old. No. 117 produced the smallest 

 amount of both milk and fat, the former being 231.063 pounds 

 and the latter 7.1 pounds. The lowest per cent of fat was given 

 by No. 141 whose average was 2.73. Her total milk and fat 

 yield was 316.125 and 8.64 pounds respectively. 



The average production for four-year olds is 414.493 pounds 

 of milk, 3.16 per cent fat and 13.091 pounds of fat. 



Among the full aged cows No. 187 (Helena Burke) leads in 

 milk production with 654.125 pounds containing 20.364 pounds 

 of fat and an average of 3. 1 1 per cent fat. The largest produc- 

 tion of fat is by No. 174 (Netherland Hengerveld) with 21.333 

 pounds from 544.875 pounds of milk containing an average of 

 3.92 per cent fat which is the highest average found among full 

 aged cows. The lowest record for milk and fat is by No. 155 with 

 228.938 pounds of milk and 8.761 pounds of fat and an average 

 of 3.83 per cent fat. The lowest per cent of fat was given by 

 No. 175 whose average was 2.52. Her yield of milk was 467.563 

 pounds and of fat 11.767 pounds. 



The average production of full aged cows is 445.701 pounds of 

 milk, 3.16 per cent fat and 14.106 pounds of fat. 



It is interesting to note that in all ages but two-year olds the 

 smallest production of milk and of fat fall to the same cow and 

 at the same test, — No. 95 in three-year olds, No. 117 in four-year 

 olds and No. 155 in full aged cows. Also, that in every age, the 

 highest per cent of fat is accompanied with the highest total yield 

 of fat, but in no case are these two accompanied by the largest 

 total yield of milk. On the other hand, the lowest per cent of 

 fat is accompanied by the smallest total yield in but one instance, 

 and that among two-year olds. 



The gain in production of the older animals over the younger 

 shows a constant decrease as the age increases. The gain of 

 three over two-year olds is 28.5 per cent in milk and 32.7 per 

 cent in fat ; of four over three-3^ear olds is 12.6 per cent in milk 

 and 18.2 per cent in fat ; and of full aged cows over four year- 

 olds is 7.5 per cent in milk and 7.7 per cent in fat. 



