118 STORRS AGRICULTURAL EXPERIMENT STATION. 
Composition of milk fed.—The amounts of total solids in the 
milk were estimated by formula from lactometer readings and 
the Babcock fat tests. Samples were saved also for chemical 
analyses, but the determinations were not made until the sam- 
ples had undergone some change, affecting, no doubt, the milk 
sugar. Accepting the analyses as reported, the distribution of 
ingredients was not materially different from that in normal 
mixed milk containing corresponding amouuts of total solids. 






TABLE 45. 
Milk solids required for one pound of gain, average of 16 animals. 
fy” By 
Se: me 
= = 
Lbs. Lbs. 
Average of 2 pair calves, 45 days, - - - - P03 19 
Average of first trial, 2 pair pigs, 40 days, - - - 1.36 E77 
Average of second trial, 2 pair pigs, 30 days, - - I.40 1756 
Average of 2 pair lambs, 60 days, 2 . - - 1.08 Teo, 
Average of 8 pair animals, - - - - - Boe Lea] 

The figures in the above table should not be regarded asa 
comparison of the assimilative capacity of different classes of 
animals. ‘The table shows in each case that the pair receiving 
the milk poor in fat required less food for a pound of gain than 
the pair receiving the milk rich in fat ; and the average for the 
former was 20 per cent. less. 
Size of fat globules in milk fed.—'The size of the fat globules 
was determined at the end of the last experiment. Milk from 
the same cows and at about the same period of lactation was 
used in the other experiments. The average diameter of the 
fat globules in the poor milk, compared with the average diam- 
eter of the fat globules in the rich milk, was as 2. to 3.5, and 
their volume as I to 5. 
Size of fat globules in human and cows’ milk.—The size of 
fat globules in cows’ milk is given by Wing as 14500 to Ysoo0 
of an inch in diameter. ‘The size of fat gO pules in human 
milk, according to Foster (p. 613), is from MWoo9 to Ye500 of 
an inch in diameter. The largest fat globules in cows’ milk 
are therefore much larger than the largest in human milk. 
