EXPERIMENT STATION BULLETINS. 183 



a, long mesh screen from a fanning mill was used. The grain was then 

 spread out in a warm room and dried and run through a fanning mill to 

 clear from straw and chaff, and was finally weighed. Samples were 

 taken for chemical analyses.. In the tables following, all figures are 

 given on a water-free basis, as it was impossible to dry the grain to the 

 same moisture content that it had before feeding. During all of these 

 operations the grain recovered from the droppings of each cow for 

 each seven day period was kept separate, so that individual records 

 could be made. One week was taken for preliminary feeding with each 

 change of the ration, and the animals were put on full feed at least 

 forty-eight hours before the start of the seven day test period, in order 

 that the full amount would be passing through the system when the 

 droppings were collected for washing. 



ANIMALS USED. 



The cows were selected from the Grade Dairy Herd. 



Cow No. 1 was Grade 16. 



Cow No. 2 was Grade 17. " 



Cow No. 3 was Grade 14. 



Cow No. 4 was Grade 22. 



Cow No. 5 was Grade 30. 



Cow No. 6 was Grade 21. 



The yearling heifers were taken from the Pure-bred Dairy Herd. 



Heifer No. 1 — Registered Holstein. 

 Heifer No. 2 — Registered Holstein. 

 Heifer No. 3 — Registered Holstein. 

 Heifer No. 4 — Registered Red Poll. 

 Heifer No. 5 — Registered Guernsey. 

 Heifer No. 6 — Registered Ayrshire. 



The calves were Holstein grades owned by Mr. G. W. Brown, a 

 neighboring farmer. They were about six months old at the start of the 

 experiment, had been raised on skim-milk, clover hay and whole oats, 

 and were in fair condition; they number from 1 to 6 consecutively. 



FEEDING. 



During the first period cows Nos. 1 and 2 received corn, Nos. 3 

 and 4 oats, and Nos. 5 and 6 corn, oats and bran. They were fed 11 

 pounds per head daily, 5I/2 pounds at each feed, morning and evening. 

 In addition, each cow had as much clover hay as she would eat up 

 clean. One week was taken to get them on feed, and one week again 

 with each change of the ration. During the second period, cows Nos. 1 

 and 2 received oats, Nos. 3 and 4, com, oats and bran, and Nos. 5 and 

 6, corn. In the third period, cows Nos. 1 and 2 were fed corn, oats 

 and bran, Nos. 3 and 4, corn, and Nos. 5 and 6, oats. During all three 

 periods the cows had the same amount, 11 pounds per head daily, or 77 

 pounds per week. 



The heifers were fed in the same way, receiving 6 pounds per head 

 daily, or 42 pounds per week. 



