Several experiments were conducted with birds differing in body weight, conformation and sternal measurements to obtain information on whether it would be possible during short term selection to influence the shape of the sternum and, if so, what influence this would have on the amount and distribution of the breast...
A comparison of the various endocrine glands, in addition to
other anatomical measurements, was made on 19 normal and 21
dwarf 2-3-month-old females and 20 normal and 20 dwarf 7-13-month-old females of the White Leghorn breed. At both ages, dwarfs
weighed significantly less and had significantly shorter shanks than
normals....
A series of trials involving Coturnix quail, turkey and chicken
eggs was conducted to determine the effects on hatching performance
of varying amounts of oxygen and carbon dioxide during storage in
plastic bags filled with nitrogen or air. Storage periods of 6 and 13
days were studied in tests involving...
The records of a population of White Leghorns at the Oregon
State Agricultural Experiment Station, submitted to accelerated
selection for hen-housed egg production on an individual and a family
basis at 40 weeks of age for 18 years, were studied. An analysis
was made to determine the relative efficiency of...
Several experiments were carried out on Coturnix coturnix
japonica to investigate the effect of selection for growth on a protein
deficient ration. A level of 27% protein was found to be optimum for
three different strains and 17.8% was the lowest protein level used
that allowed for growth and accordingly...
The Oregon State University Production Line of Single
Comb White Leghorns was under selection for increased henhoused
egg production from 1947 through 1972. Since henhoused
egg production is directly related to mortality,
mortality would be expected to decrease over the years if
selection was effective. To determine if the mortality...
Three experiments were conducted to determine the influence
of supplementary biotin and of other nutrients on dermatitis and
hatchability in both normal-size and dwarf Single Comb White Leghorn
layers.
Experiment One was divided into two parts. First, preliminary
hatchability studies were conducted with both types of layers fed
the rations...
The records of a population of sex-linked dwarf layers
at the Oregon State Agricultural Experiment Station subjected
to an accelerated selection for hen-housed egg production at
40 weeks of age for a period of over 11 years were analyzed
for selection response, and for the estimation of genetic
parameters. The...