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    Genetic relationships between detailed reproductive traits and performance traits in Holstein-Friesian dairy cattle

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    Author
    Carthy, Tara cc
    Ryan, Dan P.
    Fitzgerald, A. M.
    Evans, R. D.
    Berry, Donagh cc
    Keyword
    Fertility
    Milk production
    Body size
    Calving
    Carcass
    Date
    2015-12-17
    
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    URI
    http://hdl.handle.net/11019/1122
    Citation
    CARTHY, T. R., RYAN, D. P., FITZGERALD, A. M., EVANS, R. D. & BERRY, D. P. 2016. Genetic relationships between detailed reproductive traits and performance traits in Holstein-Friesian dairy cattle. Journal of Dairy Science, 99, 1286-129
    Abstract
    The objective of the study was to estimate the genetic relationships between detailed reproductive traits derived from ultrasound examination of the reproductive tract and a range of performance traits in Holstein-Friesian dairy cows. The performance traits investigated included calving performance, milk production, somatic cell score (i.e., logarithm transformation of somatic cell count), carcass traits, and body-related linear type traits. Detailed reproductive traits included (1) resumed cyclicity at the time of examination, (2) multiple ovulations, (3) early ovulation, (4) heat detection, (5) ovarian cystic structures, (6) embryo loss, and (7) uterine score, measured on a 1 (little or no fluid with normal tone) to 4 (large quantity of fluid with a flaccid tone) scale, based on the tone of the uterine wall and the quantity of fluid present in the uterus. (Co)variance components were estimated using a repeatability animal linear mixed model. Genetic merit for greater milk, fat, and protein yield was associated with a reduced ability to resume cyclicity postpartum (genetic correlations ranged from −0.25 to −0.15). Higher genetic merit for milk yield was also associated with a greater genetic susceptibility to multiple ovulations. Genetic predisposition to elevated somatic cell score was associated with a decreased likelihood of cyclicity postpartum (genetic correlation of −0.32) and a greater risk of both multiple ovulations (genetic correlation of 0.25) and embryo loss (genetic correlation of 0.32). Greater body condition score was genetically associated with an increased likelihood of resumption of cyclicity postpartum (genetic correlation of 0.52). Genetically heavier, fatter carcasses with better conformation were also associated with an increased likelihood of resumed cyclicity by the time of examination (genetic correlations ranged from 0.24 to 0.41). Genetically heavier carcasses were associated with an inferior uterine score as well as a greater predisposition to embryo loss. Despite the overall antagonistic relationship between reproductive performance and both milk and carcass traits, not all detailed aspects of reproduction performance exhibited an antagonistic relationship.
    Funder
    Department of Agriculture, Food and the Marine; European Union
    Grant Number
    RSF 11/S/133
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.3168/jds.2015-9825
    Scopus Count
    Collections
    Animal & Bioscience

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