Litter site and birth weight data compiled from the
farrowing records of 275 litters out of 109 purebred
Berkshire sows of the Oregon State University swine herd
during the years 1953 to 1960 inclusive were used in this
study. Genetic and environmental factors influencing
four components of reproductive performance, namely,...
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...
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...
An experiment was conducted during the period November 1967
to November 1968 at Oregon State University (OSU) and the Umatilla
Branch Experiment Station (BES) at Hermiston, two trials at each
location, to answer several questions: (1) could comparable rations
for swine be formulated by a computer on a least-cost basis;...
Thirty-six gilts were used in an experiment of 2³ factorial
design. The experiment consisted of two breeds (Yorkshire-
Berkshire and Yorkshire), two feeding regimens (pre-breeding and
post-breeding) and two levels of dichlorvos (2, 2-dichlorovinyl
dimethyl phosphate, 0 and 800 mg. per gilt per day). Pre-breeding
treatment consisted of feeding dichlorvos...
Progeny from three sires of differing genetic background were
divided within litters by sex and placed on either a 15 or 19% protein
ration. The test period began when the experimental animals weighed
60 pounds and continued until they were slaughtered at 225 pounds.
This test period was divided into...
A study was made of blood glucose levels and their relationship
to reproduction in gilts.
Twelve blood samples, two in each of three successive weeks,
before and after breeding were taken. Half of the samples were
obtained from gilts in a fasting state and half after feeding. All
samples were...