Two management systems were evaluated in terms of the effects on
calf growth, on calf weight produced per cow per year, and on reproductive
performance of fall calving cows. The alternative management
systems tested were twin foster calf production and, delayed weaning,
production of single suckled calves weaned at the...
A mathematical model was developed to simulate alternative
selection and crossbreeding strategies for commercial beef production.
Biological and economic constraints were selected to represent
typical pasture production of calves in the Northwest. The
crossbreeding study evaluated the relative economic efficiency of
different 1) mating plans when sire breeds of several...
I. The Effect of Artificial Photoperiod on Eating Behavior and Other
Behavioral Observations of Dairy Cows.
Twenty-eight cows were randomly assigned to a dairy photoperiod of
18 h light and 6 h darkness or to continuous light and observed 1 d each
month from December 1981 to February 19.82. Lighting...
I. Frozen bovine semen samples were measured by flow cytometry
(FCM) to determine if FCM analyses could be useful for sperm quality
evaluation and prediction of bull fertility. Fluorescent dyes
utilized were acridine orange, to measure sperm nuclear chromatin
heterogeneity by quantifying susceptibility of the chromatin to
denaturation, and rhodamine...
The average size and age of chinook salmon (Oncorhynchus
tshawytscha) caught in commercial fisheries along the Pacific Coast
of North America have decreased substantially in this century. These
declines might be caused in part by changes in size and age at
maturity within the stocks contributing to those fisheries. Upriver...
The Greenhorn Mountains contain a tectonic ally disrupted
ophiolite and both arc-derived and pelagic sediments. Age of major
sedimentary units within and bordering the thesis area is Early
Permian, based upon dates of conodonts and fusulinids from contemporaneous
but allocthanous limestones. Sediments near the south
boundary of the thesis area...