Report on the Agricultural Experiment Stations, 1952 Page: 88
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88 REPORT ON EXPERIMENT STATIONS, 1952
Results obtained by the South Dakota station suggest that it may
not be long before any cow can be brought into heat on a specified
day. This would make it possible to obtain special matings not now
feasible where semen of the desired bull is not readily available.
The Michigan station has been able to cause unbred cows to produce
as much as 80 pounds of milk a day by the implantation of suitable
hormones, namely diethylstilbestrol and progesterone placed under
the skin in the form of slowly dissolving pellets. This research emphasizes
that the method is still in the experimental stage but that
the results obtained probably indicate the inherited capacities of the
animals on which the hormones have been tested.
The Oregon station has studied the influence of low carotene (low
vitamin A) diets on reproduction and milk secretion. The heifers
on the lowest carotene intake had about twice the amount of breeding
difficulties as those on normal carotene intakes and produced only
about half as much milk after freshening.
According to the Alaska station, heifers came into heat much more
regularly in the winter when they were exposed to artificial light than
when they were not exposed to it.
The North Carolina station kept some of its herd bulls in experimental
rooms where the temperature was accurately controlled and
maintained over extended periods. Preliminary results indicate that
continuous exposure to temperatures above 85 F. may seriously affect
a bull's reproductive capacity.
Terramycin and aureomycin tend to reduce the viability of bull
semen according to the Arkansas, Pennsylvania, and New Jersey stations.
The Pennsylvania station recommends penicillin and streptomycin
used singly or in combination for improving the reproductive
efficiency of low-fertility bulls.
The Pennsylvania station also advocates the use of boiled milk
as a diluter for bovine semen used in artificial breeding associations.
Such a diluter is cheaper and easier to prepare than the egg yolkbuffer
diluters now in common use. This has been true both in the
field and in the laboratory. Preliminary trials with the new diluter
have also been favorable at the Vermont station.
Many of the Southern States are becoming interested in breeding
cattle that are less influenced by high temperatures than native cattle.
The Louisiana station (coop. USDA) found that purebred Holsteins
and Jerseys are just as efficient in their ability to graze as SindhiHolstein
and Sindhi-Jersey crossbred animals, as long as the environment
temperature does not go above 87 F. and the relative humidity
is around 52 percent. At temperatures above 87 the crossbreds appeared
to graze more readily than the purebred Holsteins and Jerseys.
The Missouri station found that over a period of 3 months the
hair on Brahman cattle, as it changed from dark to white, increased
in reflecting power as the temperature of the environment gradually
increased. The hair of the Brown Swiss did not show increases in
reflecting power until the temperature went above 85 F. Attempts
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1952, book, January 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5990/m1/90/: accessed March 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.