Two experimental groups of Polish Large White pigs were tested : the animals of the first group (I) consisting of 56 pigs (29 gilts and 27 hogs) were slaughtered when weighing 101 kg, and those in the other (II) group (58 gilts) were slaughtered when weighing 87 kg. Chemical analyses involving determinations of alanine aminotransferase (ALAT) and asparagine aminotransferase (AspAT) activities as well as P-RNA IO ' (P-RNAphosphorus of RNA) leucoand lymphocytes were carried out in the 4-, 6-, and

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... 7-month-old pigs of group I, and in the 4-and 6-month-old ones of group II. Blood serum Cu and Mg contents were determined ad above in group II and in the 4-month-old pigs in group I. The objective of the work presented was to find a relationship between the blood biochemical parameters studied and porcine meat quality indices for various weights at slaughter (101 and 87 kg). The following conclusions were drawn : 1. Of the blood biochemical parameters and meat quality indices tested, it is only the meat rigor mortis that is significantly influenced by sex, a highly significant difference in favour of hogs being found. 2. From the pig breeder's point of view, the most valuable blood biochemical parameters are : blood serum AspAT, Cu, and Mg, and peripheral blood P-RNA/10' leucocytes, all of them showing a statistically significant correlation with meat quality indices as early as in the 4-month-old pigs. 3. A phenotypic correlation does not suffice to state with certainty that one character in a definite way influences another ; thereforein order to assess the relationships involved more definitelyit is necessary to have a more abundant study material as well as to calculate genetic correlations between the blood biochemical parameters and meat quality indices.