Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Application of X-ray Computer Tomography (CT) in Cattle Production

  • Hollo, G. (Institute of Diagnostic Imaging and Radiation Oncology, Faculty of Animal Science University of Kaposvar) ;
  • Szucs, E. (Faculty of Agricultural and Environmental Sciences, Szent Istvan University) ;
  • Tozser, J. (Faculty of Agricultural and Environmental Sciences, Szent Istvan University) ;
  • Hollo, I. (Institute of Diagnostic Imaging and Radiation Oncology, Faculty of Animal Science University of Kaposvar) ;
  • Repa, I. (Institute of Diagnostic Imaging and Radiation Oncology, Faculty of Animal Science University of Kaposvar)
  • Received : 2007.03.13
  • Accepted : 2007.06.11
  • Published : 2007.12.01
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Abstract

The aim of this series of experiments was to examine the opportunity for application of X-ray computer tomography (CT) in cattle production. Firstly, tissue composition of M. longissimus dorsi (LD) cuts between the $11-13^{th}$ ribs (in Exp 1. between the $9-11^{th}$ ribs), was determined by CT and correlated with tissue composition of intact half carcasses prior to dissection and tissue separation. Altogether, 207 animals of different breeds and genders were used in the study. In Exp. 2 and 3, samples were taken from LD cuts, dissected and chemical composition of muscle homogenates was analysed by conventional procedures. Correlation coefficients were calculated among slaughter records, tissues in whole carcasses and tissue composition of rib samples. Results indicated that tissue composition of rib samples determined by CT closely correlated with tissue composition results by dissection of whole carcasses. The findings revealed that figures obtained by CT correlate well with the dissection results of entire carcasses (meat, bone, fat). Close three-way coefficients of correlation (r = 0.80-0.97) were calculated among rib eye area, volume of cut, pixel-sum of adipose tissue determined by CT and intramuscular fat or adipose tissue in entire carcasses. Estimation of tissue composition of carcasses using equations including only CT-data as independent variables proved to be less reliable in prediction of lean meat and bone in carcass ($R^2 = 0.51-0.86$) than for fat (($R^2 = 0.83-0.89$). However, when cold half carcass weight was also included in the equation, the coefficient of determination exceeded $R^2 = 0.90$. In Exp. 3 tissue composition of rib samples by CT were compared to the results of EUROP carcass classification. Findings revealed that CT analysis has higher predictive value in estimation of actual tissue composition of cattle carcasses than EUROP carcass classification.

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References

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