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    Effects of Gender on Protein Requirements and the Somatotropic Axis in Feedlot Cattle

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    Author
    Bailey, Clayton R.
    Issue Date
    2006
    Keywords
    Crude Protein
    Beef Cattle
    Somatotropic Axis
    Anabolic Implants
    Gene Expression
    Advisor
    Duff, Glenn C.
    Committee Chair
    Duff, Glenn C.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Two trials were conducted to evaluate the effects of gender on optimal CP concentrations (TRIAL 1) and gender and anabolic implants on the somatotropic axis in feedlot cattle (TRIAL 2). More specifically, the objective of TRIAL 1 was to examine the effects of 3 dietary CP concentrations on performance, carcass characteristics, and serum urea nitrogen (SUN) in finishing steers and heifers and the objective of TRIAL 2 was to evaluate the effects of ovariectomy (OVX) and implantantation (200 mg of trenbolone acetate and 28 mg of estradiol benzoate; Synovex-Plus) on performance, serum urea nitrogen (SUN), serum IGF-1, and mRNA expression of hepatic IGF-1, GH receptor, and E receptor-α as well as pituitary GH, E receptor-α and GHRH receptor in feedlot heifers. TRIAL 1 results indicated that ADG was optimized when both steers and heifers were fed 12.5% CP and G:F was optimized for steers fed 12.5% CP but heifer G:F was optimal at 14.0% CP. Feeding diets containing 11.0% CP appears to cause a protein deficiency in both steers and heifers. TRIAL 2 data indicated that gender had no influence on performance or SUN in feedlot heifers. Serum IGF-1 is increased more in OVX heifers than intact heifers due to a greater response to implantation from the OVX heifers. However, the reason for the extra increase in serum IGF-1 is not clear, although trends in gene expression analysis suggest the possibility that the increased serum IGF-1 may be controlled outside of the somatotropic axis. Further research is warranted to examine the effects of OVX and anabolic implants on the somatotropic axis.
    Type
    text
    Electronic Dissertation
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Animal Sciences
    Graduate College
    Degree Grantor
    University of Arizona
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