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Full-Text Articles in Life Sciences
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 …