Montana State University (MSU) Library in Bozeman Montana State University - Home Montana State University Libraries - Home
    • Login
    View Item 
    •   ScholarWorks Home
    • Scholarship & Research
    • Theses and Dissertations at Montana State University (MSU)
    • Theses and Dissertations at Montana State University (MSU)
    • View Item
    •   ScholarWorks Home
    • Scholarship & Research
    • Theses and Dissertations at Montana State University (MSU)
    • Theses and Dissertations at Montana State University (MSU)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Comparison of organic vs. inorganic trace minerals on rate and efficiency of gain and conception rates in beef heifers

    Thumbnail
    View/Open
    WhitehurstW0512.pdf (1.081Mb)
    Date
    2012
    Author
    Whitehurst, William Ashley III.
    Metadata
    Show full item record
    Abstract
    Objectives of this experiment were to compare rate and efficiency of gain, and conception rates of yearling heifers supplemented with Cu, Zn and Mn as either methionine chelated trace mineral (CTM) or the same minerals in SO 4 form. The experimental design utilized 3 ranches, each having 2 replications per treatment with pen as the experimental unit for ADG, DMI and G:F. Heifer was the experimental unit for pregnancy rates. Ranch 1 contained 498 Angus heifers, ranch 2, 236 Red Angus cross heifers, and ranch 3, 1,742 Angus cross heifers. All heifers were fed silage based diets that contained approximately 13.5% CP, 64% TDN (DM basis) and had low levels of SO 4, Mo or Fe in feed or H 2O. Diets contained 24 ppm Cu, 70 ppm Zn and 64 ppm Mn. Supplements were fed for 181 d (Ranch 1), 149 d (Ranch 2) and 151 d (Ranch 3) prior to breeding. Heifers were weighed at trial initiation (BW 270 kg ± 2.8), end of drylot feeding, at breeding and at pregnancy diagnosis. Ranch 1 heifers were bred by AI followed by natural service (45 d breeding), Ranch 2 heifers were bred by natural service (50 d breeding) and Ranch 3 heifers were bred by AI once. Pregnancy was determined via ultrasound. Ranch effects were significant (P < 0.001) for gain, ADG, G:F and overall pregnancy rate, but not for conception in the first 21 d. No ranch x treatment interactions were detected for any measurements (P e 0.47) and no differences (P e 0.46) were detected between treatments for total gain, ADG, G:F or the number of heifers that conceived during the first 21 d on Ranches 1 or 2. Conception rate increased (P = 0.03) for CTM heifers from ranch 3 with one AI breeding. Across ranches, conception rates during the first 21 d of breeding did not differ (P = 0.12) between treatments but overall pregnancy rate was greater (P = 0.05) for heifers supplemented with CTM. Under the conditions of this experiment results suggest that supplementation with CTM contributed to greater pregnancy rates in heifers.
    URI
    https://scholarworks.montana.edu/xmlui/handle/1/2533
    Collections
    • Theses and Dissertations at Montana State University (MSU)

    MSU uses DSpace software, copyright © 2002-2013  Duraspace
    Contact Us | Send Feedback
     

     

    Browse

    All of ScholarWorksCommunities & CollectionsBy Issue DateAuthorsTitlesDepartmentsItem TypeThis CollectionBy Issue DateAuthorsTitlesDepartmentsItem Type

    My Account

    Login

    Guidelines & Policies

    AllFor authorsWhy to submitHow to submit

    Statistics

    View Usage Statistics

    MSU uses DSpace software, copyright © 2002-2013  Duraspace
    Contact Us | Send Feedback