Life Sciences Commons^™

Color Vision In The Bovine, B. John Gilbert

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Eight heifers were trained using operant conditioning to press a plate to receive a feed reward. Different wavelengths of light were presented as correct and incorrect stimuli. Positive and negative responses to the stimuli were registered electronically. Daily sessions of 17 minutes were conducted in a chamber with external light being excluded.

The duration of the stimulus was fixed at 17 seconds after which stimuli were randomly presented. Only presses on the plate when the correct stimulus was presented were reinforced with feed. A 75% correct choice was the criterion used as acceptable discrimination.

Ratios of correct to incorrect responses …

Coprecipitation Of Phosphorus With Calcium Carbonate In Bear Lake, Utah - Idaho, Paul W. Birdsey Jr.

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Monitoring of Bear Lake was conducted in 1981 and 1982 to describe the current limnology and trophic state of the lake. The nutrient loadings of various parameters were measured from April, 1981 through June, 1982. The rate of coprecipitation of phosphorus was determined for different initial phosphorus concentrations by use of non-algal assays. Algal bioassays with Selenastrum capricornutum were used to determine the reduction in potential algal biomass as a result of the coprecipitation of phosphorus.

The lake exhibited chemical characteristics indicative of mesotrophy or eutrophy. Total phosphorus values averaged 11μg/1 for 1981 and 20 μg/1 for 1982. A hypolimnetic …

Predicting Digestibilities Of Alfalfa Hays With Near Infrared Reflectance Spectroscopy, David H. Clark

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Forty-four alfalfa hays from different cuttings, maturities, and locations were fed to sheep in a digestion study. Subsamples of the hays along with corresponding fecal samples were ground and analyzed for dry matter, (DM), organic matter (OM), crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), and permanganate lignin. In vivo digestibility (IVDMD) were also determined fro each hay.

The hay and fecal samples were scanned with a near infrared reflectance spectrophotometer. Chemical and digestible data for each hay and fecal sample were entered into the computer and separate multiple regression equations developed.

Fifteen other alfalfa hays with …

Effect Of Overall Indispensible Amino Acid Levels On Performance Of Broiler Chicks, Jack D. Kelly

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An attempt was made to determine the effect of overall indispensible amino acids (IAAs) level on growth rate and efficiency of broiler chicks. There were two overall levels: the low (8.33% IAA, 17.6% CP containing all IAAs at the minimum requirement found in preliminary studies), and the high (10.77% IAA, 21.5% CP with IAAs increased by 28%). Both diets contained 13.7 Megajoules ME (3277 Kcal) per kilogram.

These two diets along with other variations of the two diets were fed to Hubbard chicks. Growth rate, with the low IAA diet was as good as with the high, but feed efficiency …

The Vertical Distribution And Feeding Chronology Of Larval Bear Lake Sculpin (Cottus Extensus) In Bear Lake, Utah-Idaho, D. Neverman Devroy, Wayne A. Wurtsbaugh, S. Ohlhorst

Watershed Sciences Faculty Publications

Preliminary sampling in Bear Lake, Utah/Idaho, with bottom trawls and larval fish nets indicate