COS* 
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LIBRARY 
RECEP. 
• JUL' 7 192|4 
UNITED STATES DEPARTMENT OF AGRICULTURE 
i. \ .■ 
DEPARTMENT BULLETIN No. 1272 
Washington, D. C. 
July 8, 1924 
mmmsm 
VALUES OF VARIOUS NEW FEEDS FOR DAIRY COWS 
By T. E. Woodward, H. T. Converse, W. R. Hale, Dairy Husbandmen, and 
J. B. McNulty, Assistant Dairy Husbandman, Dairy Division, Bureau of 
Animal Industry 1 
CONTENTS 
Page 
Plan of the experimental work 1 
Fish meal compared with cottonseed meal... 2 
Peanut feed compared with cottonseed meal . 3 
Potato meal compared with corn meal 5 
Velvet-bean meal compared with cottonseed 
meal i 6 
Sweet-potato meal compared with corn meal. 7 
Page 
Potato silage compared with corn silage 7 
Apple-pectin pulp compared with beet pulp. 8 
Hydrolyzed sawdust compared with corn 
meal 9 
Cane molasses as a supplementary feed 12 
Summary 14 
PLAN OF THE EXPERIMENTAL WORK 
During the last few years the Dairy Division has conducted feeding 
trials at its experiment farm, BeltsvLlle, Md., with a number of feed- 
stuffs in order to determine their values as feeds for dairy cows. 
Some of these feeds have only recently been prepared in a 
commercial way. 
The same general plan was used in conducting most of the experi- 
ments here reported. A certain number of cows of at least average 
production were selected and divided into two equal groups balanced 
as nearly as possible with reference to production, breed, and body 
weight. Special care was taken to select only such cows as would be 
likely to continue throughout the experiment without undue diminu- 
tion in milk flow due to advanced stage of lactation or approaching 
parturition. The reversal system of feeding was used, usually 
allowing 10 days for the cows to become accustomed to their rations 
and the same length of time when the rations were reversed. The 
length of the experimental periods varied according to the feeding 
materials available and the length of time it was thought the cows 
would give milk before beginning to go dry. 
In every case the feed under investigation was compared with 
some standard feed as similar in composition as could be obtained, 
and one which might be replaced by the new feed if found satisfactory. 
Since the system of measuring the results of feeding experiments 
is not sensitive to slight changes in the ration, the general practice 
Mr. Hale resigned in March, 1917, and Mr. McNulty in August, 1919. 
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