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Full-Text Articles in Meat Science
Effect Of Supplemental Trace Mineral (Zinc, Copper, And Manganese) Source On Growth Performance, Morbidity, And Trace Mineral Status In Beef Cattle, Anthony Ryan
Graduate Theses and Dissertations
A series of studies were conducted to determine the effect of supplemental trace mineral source on growth performance, morbidity, and trace mineral status in growing beef cattle. The first experiment evaluated supplemental trace minerals from sulfate, organic, or hydroxy sources on growth performance and morbidity. Crossbreed beef calves were assigned to 1 of 3 treatments consisting of supplemental zinc (360 mg/d), copper (125 mg/d), and manganese (200 mg/d) from inorganic, organic, or hydroxy sources fed daily over a 42 to 45-d backgrounding phase. After removal of chronic and dead calves from the data set, trace mineral source had no effect …
Influence Of Steroids And Gonadotropins On Reproduction In Beef Cattle, Thomas L. Devine
Influence Of Steroids And Gonadotropins On Reproduction In Beef Cattle, Thomas L. Devine
Graduate Theses and Dissertations
The objective of this thesis was to evaluate the influence of steroids and gonadotropins on reproduction in beef cattle. In experiment 1, beef heifers were used to determine the influence of growth-promoting implants on growth, reproductive development, estrous behavior, and pregnancy rate. Heifers were assigned to 1 of 4 implant treatment groups: control (CON); trenbolone acetate (TBA); trenbolone acetate plus estradiol (TBA+E2) or zeranol (ZER). Heifers were implanted once, A.I. and exposed to bull during this experiment. Body weight, BCS, HH, RTS, estrous behavior and pregnancy data were collected throughout this experiment. Average daily gain of heifers was greater for …
Balking Incidence And Behavioral Responses During Handling In Fed Cattle With Genetic And Carcass Implications, Michelle Lynn Thomas
Balking Incidence And Behavioral Responses During Handling In Fed Cattle With Genetic And Carcass Implications, Michelle Lynn Thomas
Graduate Theses and Dissertations
Temperament in cattle is often defined as the reactivity to human handling or novel environments. Temperament differences have been shown among breed-type categories, within breed types, among crossbreds, and between sexes. Temperament tests are typically completed at weaning time on beef cattle, and rarely on fed Holstein steers for beef production. Balking behavior, or cease in forward motion, in the cattle working facility can pose welfare issues as the electric prod use to coerce movement is implemented. Three observational field projects were designed to evaluate balking behavior incidence in unknown breed-types at the processing plant, Holstein steers in the feedlot …