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Reproduction And Hematology Of The Cache Elk Herd, Thomas B. Follis
Reproduction And Hematology Of The Cache Elk Herd, Thomas B. Follis
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The initial three years of a 10-year reproductive study of elk involved three major phases. A fourth was added because of convenience. Objective 1 was to ascertain pregnancy rates in yearling and mature elk by rectal palpation, associate these rates with subsequent fall cow/calf ratios, and to test concurrently an ultrasonic fetal heart detector. Rectally observed anatomical changes in gravid uteri of cattle were directly applicable to elk. Ultrasonic detections of pregnancies in elk and deer were unsuccessful.
Pregnancy rates in the 1969-70 winter of 100 and 0 percent, respectively, for 19 adult and five yearling elk were associated with …
Population Ecology Of Uinta Ground Squirrels, Norman A. Slade
Population Ecology Of Uinta Ground Squirrels, Norman A. Slade
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The behavior and ecology of Uinta ground squirrels (Spermophilus armatus) at the Utah State University Forestry Field Station northeast of Logan, Utah were studied from 1964-1971 to determine the role of behavior in population regulation. From 1965 to 1968, data were collected to establish population norms. In 1968, the population density was reduced experimentally to help elucidate regulatory processes. This paper compares the dynamics of the population before and after the population reduction.
Before the density reduction, juvenile survival was lower than that of yearlings and adults. The disappearance of juveniles was associated with their tendency to disperse …