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    • Irish Journal of Agricultural & Food Research
    • IJAFR, Volume 50, no. 2, 2011
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    • Irish Journal of Agricultural & Food Research
    • IJAFR, Volume 50, no. 2, 2011
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    Relationship between live weight and body condition score in Irish Holstein-Friesian dairy cows

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    Author
    Berry, Donagh cc
    Buckley, Frank
    Dillon, Pat
    Keyword
    Body condition score
    Calving interval
    Live weight
    Parity
    Date
    2011
    
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    URI
    http://hdl.handle.net/11019/63
    Citation
    Relationship between live weight and body condition score in Irish Holstein-Friesian dairy cows. D.P. Berry, F. Buckley and P. Dillon. IJAFR Vol. 50, No. 2 (2011) pp. 141-147
    Abstract
    The objective of this study was to quantify the change in live weight (LWT) per unit change in body condition score (BCS) for Irish Holstein-Friesian dairy cows. Mixed model analyses were performed on 82 948 test-day records of BCS and LWT across 11 075 lactations from 7391 cows, representing 62 commercial and 4 research herds, during the years 1999 and 2000. Factors included in the mixed models were parity, stage of the inter-calving interval and the three-way interaction between herd, year and fortnight of the calendar year at calving. Interactions between the effect of BCS and either parity or stage of the inter-calving interval were included in some models to evaluate the effect of these factors on the relationship between LWT and BCS. A moderate correlation (0.49) existed between BCS and LWT in the complete dataset, but it differed significantly with parity and stage of the inter-calving interval (range 0.36 to 0.59). Analysis of the entire dataset yielded an estimate of 50 kg LWT change per unit change in BCS and this coefficient ranged from 39 kg to 66 kg, depending on parity or the stage of the inter-calving interval. Accurate values of LWT per unit BCS are important input parameters for animal or herd-level biological models designed to evaluate the energy demands of the animal or herd.
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    IJAFR, Volume 50, no. 2, 2011
    Animal & Bioscience

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