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    Relationship between dairy cow genetic merit and profit on commercial spring calving dairy farms

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    Author
    Ramsbottom, George
    Cromie, A. R.
    Horan, Brendan cc
    Berry, Donagh cc
    Keyword
    Dairy
    Genetic
    Economic
    Stocking rate
    Fertility
    Date
    2011-12
    
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    URI
    http://hdl.handle.net/11019/391
    Citation
    G. Ramsbottom, A. R. Cromie, B. Horan and D. P. Berry (2012). Relationship between dairy cow genetic merit and profit on commercial spring calving dairy farms. animal, 6, pp 1031-1039. doi:10.1017/S1751731111002503
    Abstract
    Because not all animal factors influencing profitability can be included in total merit breeding indices for profitability, the association between animal total merit index and true profitability, taking cognisance of all factors associated with costs and revenues, is generally not known. One method to estimate such associations is at the herd level, associating herd average genetic merit with herd profitability. The objective of this study was to primarily relate herd average genetic merit for a range of traits, including the Irish total merit index, with indicators of performance, including profitability, using correlation and multiple regression analyses. Physical, genetic and financial performance data from 1131 Irish seasonal calving pasture-based dairy farms were available following edits; data on some herds were available for more than 1 year of the 3-year study period (2007 to 2009). Herd average economic breeding index (EBI) was associated with reduced herd average phenotypic milk yield but with greater milk composition, resulting in higher milk prices. Moderate positive correlations (0.26 to 0.61) existed between genetic merit for an individual trait and average herd performance for that trait (e.g. genetic merit for milk yield and average per cow milk yield). Following adjustment for year, stocking rate, herd size and quantity of purchased feed in the multiple regression analysis, average herd EBI was positively and linearly associated with net margin per cow and per litre as well as gross revenue output per cow and per litre. The change in net margin per cow per unit change in the total merit index was h1.94 (s.e.50.42), which was not different from the expectation of h2. This study, based on a large data set of commercial herds with accurate information on profitability and genetic merit, confirms that, after accounting for confounding factors, the change in herd profitability per unit change in herd genetic merit for the total merit index is within expectations.
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1017/S1751731111002503
    Scopus Count
    Collections
    Grassland Science
    Animal & Bioscience

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