ORIGINAL PAPERS current state of fasting. The correlation coefficients (Table 4) showed that, compared to animals infected with Tvivax, animals infected with Tcongolense with a greatly decreased DMI showed a smaller increase in plasma urea, but a greater increase in plasma NEFA and BHBA. In addition, plasma TP levels were lower in animals Infected with Tcongolense than in animals infected with Various characteristics of the KLH-specific immune response were studied in 988 sows of four breeds. KLHspecific immune responses showed considerable variability. The applied statistical model explained 63 to 73 per cent of this variation. influences, expressed as the heritability estimate, were rather high for the IgG response (0.33), as well as for the skin reaction (0.26) and the LST (0.41 -0.45). A positive correlation between the various immune parameters was found. Selective breeding for immune responsiveness seems to be feasible, but selection for cellular as well as
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