Report on the Agricultural Experiment Stations, 1953 Page: 42
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42 REPORT ON EXPERIMENT STATIONS, 1953
pared with pigs fed higher levels of protein. The addition of aureomycin
or a combination of aureomycin and Bus improved daily gains
and feed efficiency.
At the Oklahoma station weanlino pigs fed a 12-percent protein
ration of corn and soybean meal supplemented with 0.1 percent of the
amino acid DL-lysine made gains equal to those on a 16-percent protein
ration. The additional lysine increased the rate of gain by '23
percent and reduced feed consumption per pound of gain by 19 percent
compared with the basal ration. Similar findings were reported by
the Iowa station.
Experiments at the Ohio station show that pigs fed a low protein
ration, with or without an antibiotic, gained as rapidly and efficiently
as similar pigs fed standard or high protein rations in winter, but
not in summer. The pigs received protein levels of 12.4, 15.3, and
18.2 percent to a weight of 120 pounds, with a reduction of 2 percent
in each level beyond the 120-pound weight. The standard and high
protein rations produced leaner carcasses, however, than the low
Experiments at the North Dakota station show that when properly
supplemented, pulverized and pelleted barley and oat rations for
growing swine were equal to corn on the basis of rate of gain and
feed cost. Pulverizing and pelleting the grain improved palatability
and feed consumption. Gains of as much as 2.2 pounds per day were
obtained on several lots of pigs from 40 pounds to market weight
of about 200 pounds.
Trials at the Nevada station show that growing pigs can utilize
more roughage than is commonly believed. Crossbred pigs fed a ration
containing up to 50 percent alfalfa made satisfactory gains with a
saving of about 20 percent in feed cost. In these experiments 1 pound
of alfalfa was approximately equal in feeding value to a pound of
grain. Pelleting of the ration improved pig performance. The
station recommends that at an early age pigs be started on a high
roughage ration containing high quality alfalfa ground to suitable
Lamb gains stimulated by plant estrogenic substances
At the Iowa station liveweight gains in lambs have been increased
as much as 40 percent by supplementing the ration with estrogenic
substances isolated from alfalfa and clover hay, and soybean oil meal.
These substances were also effective in stimulating gains in cattle.
According to these investigators, not all kinds of hay or rations
contain sufficient amounts of these newly identified substances to bring
about maximum gains in growing livestock. This research holds
promise that these substances as well as others now available, such as
stilbestrol, can be produced commercially so that they may be added
to rations in optimum amounts for improving overall production of
sheep and cattle.
Protein needs of breeding ewes
Is it profitable under farm conditions to feed concentrates to breeding
ewes during late pregnancy ? Missouri station research indicates
that mature ewes wintered on good pastures do not require concen
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1953, book, 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5989/m1/44/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.