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Study of Carcass, organ, muscle, fat tissue weight and concentration in rats fed CLA or its precursors by Principal Component Analysis

  • Author(s) / Creator(s)
  • Carcass, organ and muscle weight, and fat tissue data were obtained from 30 weaned male Wistar rats fed one of three diets, (10 rats/diet) over a period of 60 d. The diets were base with synthetic conjugated linoleic acid (CLA), sunflower oil or beef enriched CLA. The CLA diet contained the base diet and 18.2 g kg-1 of synthetic CLA (53% cis 9, trans 11 and 44% trans 10,cis 12) replacing 26% of the soybean oil, the sunflower oil diet contained the base plus 70 g kg-1of sunflower oil replacing all the soybean oil, and the CLA-enriched diet contained the base plus 200 g kg-1 of beef enriched bio-formed CLA replacing the casein. Data were subjected to a principal component analysis (PCA). The first principal component (PC) extracted carcass weight, organ and muscle weight variables and accounted for 41.3% of the total variation. The second principal component included all of the fat tissue variables and accounted for 20.5% of the total variation. The rats fed the synthetic CLA diet were associated with high carcass, liver, kidney, heart, gastrocnemius and soleus muscle weights, and low retroperitoneal and inguinal fat weights, and adipocyte numbers in the fat tissues. In rat models, short periods of synthetic CLA feeding may have a greater impact on decreasing fat accretion in selected fat tissues than feeding CLA-enriched meat. The PC analysis provides means of combining into one or a few components traits that have similar responses, each component being orthogonal to all other components, whereas, in a conventional univariate analysis of variance each dependent variable is analyzed separately in relation to one or more independent variable.

  • Date created
    2004
  • Subjects / Keywords
  • Type of Item
    Article (Published)
  • DOI
    https://doi.org/10.7939/R3X921M4H
  • License
    @2004 Goonewardene, L. A., Wang, Z., Mir, Z., Okine, E. K., Mir, P. S. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
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  • Citation for previous publication
    • Goonewardene, L.A., Wang, Z., Z. Mir, E. K. Okine, and P. S. Mir. (2004). Study of Carcass, organ, muscle, fat tissue weight and concentration in rats fed CLA or its precursors by Principal Component Analysis. Canadian Journal of Animal Science, 84(3), 537-543. http://dx.doi.org/10.4141/A03-068
  • Link to related item
    http://dx.doi.org/10.4141/A03-068