98 STORRS AGRICULTURAL EXPERIMENT STATION. 
herds which had a nutritive ratio greater than 1:6, are given in 
the fifth, and those which had a nutritive ratio less than 1:6 
in the sixth columns. It will be observed that the average 
five days’ yield per cow of the animals of the wider rations was 
3.9, and that of the animals of the narrower was 4.5. pounds 
butter-fat in five days. The animals having the narrower ration 
produced on the average .6 of a pound more of butter-fat in 
five days than did those having the wider. | 
In the last two columns of the table, the butter-fat yields are 
averaged in accordance with the amount of digestible protein in 
the rations. It will be observed that the herds which received 
more than 2.3 pounds of digestible protein per day gave an aver- 
age of 4.5 pounds per cow of butter-fat in five days, while those 
under 2.3 gave only 3.6 pounds per cow of butter-fat in the same 
time. In other words, the animals having the larger amounts of 
protein gave on the average .g of a pound more of butter-fat in 
five days than did those having the smaller quantities of protein. 
With the exception of the animals of herd 10, those which are 
classified as receiving more than 2.3 pounds of digestible protein 
were all actually receiving about 2.5 or more pounds of digestible 
protein per day. ‘The animals of this herd (10) were all practi- 
cally new milch, six of them having just calved, five of the others 
being less than two months after calving, and all but one being 
four months or less since calving. This would seem to account, 
in part at least, for the high yield of butter-fat. 
The largest butter-fat yields, with the exception of that from 
herd ro, were from herds 12,3,14and 1. Therations fed these herds 
contained respectively 2.99, 3.01, 2.66 and 2.51 pounds of digest- 
ible protein. ‘Their nutritive ratios were as follows: 1:4.5, 1:5.7, 
“125.8, 1:6,2, “Their fuel values were 30:750,°37,050.)¢ 3.7. mem 
33,450 calories. ‘Too much importance should not be attached to 
these results, as they may have been partly accidental and due 
to causes other than feed. It is, nevertheless, a noteworthy fact 
that in the cases in which the cows were in about the same period 
of lactation, the yields of butter-fat decreased as the protein de- 
creased, and as the nutritive ratio increased. The largest yield 
was from a herd receiving a very narrow ration (1:4.5) and one 
which contained a large amount (about 3 pounds) of digestible 
protein. The average of all these rations is a good deal wider 
than that of the German (Wolff’s) standard, being very nearly 
as wide as that of the Wisconsin Station. The weight of 




