The effect of 2-aminoethyl-2-thiopseudourea[superscript .]Br[superscript .]HBr (AET),
2-mercaptoethylamine[superscript .]HC1 (MEA) and trisodium calcium chelate of
diethylenetriaminepentaacetic acid (CaNa₃DTPA) on the radiosensitivity
of rat fetus was investigated. A total of 1256 fetuses were
critically examined.
Exposure of rats to 200 r whole-body X-irradiation at 9.5 days
of gestation resulted in a...
Growth data compiled in this study were collected by using
pigs farrowed during the fall, 1963 and spring, 1964 farrowing seasons
of the Oregon State University swine herd. Thirty-seven trios
of light-, medium- and heavy-birth-weight suckling pigs were used to
determine the effect of birth weight on subsequent rate of...
In order to study maternal cardiovascular adjustments to pregnancy, serial determinations were carried out on five pregnant and lour nonpregnant ewes. Measurements were made at approximately two to three week intervals, and continued for nine weeks after delivery. Cardiac output was measured with the dye dilution technique using Evans blue...
The objective of the thesis was to determine the effects of
isolated coumestrol on the growth, carcass characteristics and
certain organs of wether lambs. The first of two trials was conducted
over an eight week period with two groups of heavy wether
lambs. Trial two was conducted over an 11...
A Cr₂0₃, and cellulose fibre mixture was used with cattle, in
three grazing and two semi-restricted experiments, to study the mode
of its excretion, the possibility of using it in a once-daily dosing and
grab-sample regime to estimate fecal output and in a field experiment
to test a hypothesis involving...
Digestibility experiments were carried out with dairy heifers to
determine the digestibility of orchard grass, Dactylis glomerata, and
also to evaluate the accuracy of various indicator techniques in pasture
digestibility experiments. Chromic oxide was used as an external
indicator to predict fecal dry matter output in three digestion
trials. Cut...
The investigations reported are based on two studies; the first
is concerned with the selection practiced for performance in one inbred
Angus and three inbred Hereford lines of cattle, the realized
responses, levels of inbreeding and associated performance, and
heritabilities of the performance traits.
Selection differentials for all performance traits...
The design of this study was suggested by the following observations:
(1) the successful application of recurrent selection
techniques in obtaining improvement of hybrid performance in corn
and Drosophila, (2) the increased production realized by rotational
crossbreeding, and (3) the expression of a relatively large degree
of hybrid vigor in...
Eight purebred rams (four Suffolk and four Panama) previously
selected as high and low on the basis of post-weaning performance
feed test of 84 days were used each of three years. Each of the
rams was mated to approximately 25 grade Panama ewes each year.
One ram and 25 ewes...
A series of four animal experiments utilizing 129 pigs
and associated laboratory studies was conducted to study the causes
of the lowered performance on high barley rations fed to swine. Previous
work at this Station has shown barley to have a value of 80-85
percent of corn for swine, and...