Life Sciences Commons^™

Broiler Performance And Mineral Utilization Of Enzyme-Supplemented Defatted Rice Bran Diet During Heat Stress, Ornprapun Puminn

Doctoral Dissertations

Defatted rice bran is a by-product from the solvent-extraction of rice bran. It contains high amounts of phytate and non-starch polysaccharides, which are considered to be two major antinutritional factors that limit the use of rice bran in poultry diets. Two experiments were conducted to evaluate broiler performance and mineral utilization of defatted rice bran diets supplemented with commercial enzyme phytase alone or a combination of phytase and xylanase under two different environmental temperatures. In the first experiment, six replicate groups of day-old chicks were assigned to five dietary treatments comprised of a control corn-soybean meal diet with 25% corn …

The Effects Of Dietary Additives On The Growth Performance And Occurrance Of Resistant Bacteria In Weanling Pigs, January Beth Pulliam

Doctoral Dissertations

Three replicate trials, with a total of 36 ileal cannulated pigs, were conducted to determine the effects of including carbadox or mannanoligosaccharides in weanling pig diets. Individual crossbred (Yorkshire X Landrace X Duroc) pigs were used as the experimental units and were weaned at approximately 21 days of age, balanced by gender, genetics and weight, and allotted to pens in groups of three. Pens were randomly assigned to one of four treatments including: AB) 55 mg carbadox/kg, BM) 0.2% phosphorylated mannanoligosaccharide, RT) a rotation of the above two treatments, or CT) NRC based control treatment with no additives. Pigs were …

The Effects Of Retinol During In Vivo And In Vitro Oocyte Maturation And Embryonic Development., Tracy Elizabeth Livingston

Doctoral Dissertations

Previous studies demonstrated that retinol administration to ewes, followed by natural service, resulted in embryos with improved competence to develop in vitro. In vivo studies with sheep and in vitro experiments with bovine embryos, were designed to evaluate the effects of retinol and to understand its mechanism(s) of action.

The primary objective of the first experiment was to analyze ovine oocyte metabolism, and to assess the effects of retinol on this process. Sheep oocytes were matured in vitro over a 24 hour period in the presence of different radiolabeled substrates. Results revealed that oxidative metabolism measured by glutamine showed …

Body Condition Score And Dairy Form As Indicators Of Dairy Cattle Disease And Reproductive Performance., Chad D. Dechow

Doctoral Dissertations

The objectives of this research were to estimate heritabilities and correlations between body condition score (BCS) from various sources, determine the genetic relationship among BCS, dairy form, cow health and reproductive performance and investigate various models to analyze BCS and dairy form. BCS was obtained from herds using PCDART dairy management software and from linear type appraisals by Holstein classifiers. Cow health data was obtained from several herds recording disease treatments. Genetic evaluations for cow health in Denmark were also obtained. Reproductive data and yield data were provided by DRMS and AIPL-USDA. Heritabilities and correlations among traits were estimated with …