Silanikove et al. (2003) demonstrated a negative linear
relationship between CN concentrations in milk of
humans, goats, cows, sheep, and mice, on one hand,
and aCa
2+ on the other, a finding that is consistent with
the fact that CN are powerful Ca chelators. In the present
study, aCa
2+ was negatively related to measures
of proteolysis (p-p), which was consistent with similar
findings in sheep (Leitner et al., 2004a). The association
betweenCNdegradation and the reduction in aCa
2+ may
be related to the exposure of phosphoserine groups that
are hidden within the casein micelles because these
molecules are responsible for the Ca-chelating properties
of CN. Casein degradation occurs in the gland during
the intervals between milkings (Le Roux et al., 1995;
Urech et al., 1999). Thus, the differences in aCa
2+ between
the infected and uninfected glands may represent
the additional CN degradation in the infected
glands. The present results further support the conclusion
that measurement of aCa
2+, which is rapid and
cheap, appears to be a valuable tool for monitoring the
extent of CN degradation under various conditions
Silanikove et al. (2003) demonstrated a negative linear
relationship between CN concentrations in milk of
humans, goats, cows, sheep, and mice, on one hand,
and aCa
2+ on the other, a finding that is consistent with
the fact that CN are powerful Ca chelators. In the present
study, aCa
2+ was negatively related to measures
of proteolysis (p-p), which was consistent with similar
findings in sheep (Leitner et al., 2004a). The association
betweenCNdegradation and the reduction in aCa
2+ may
be related to the exposure of phosphoserine groups that
are hidden within the casein micelles because these
molecules are responsible for the Ca-chelating properties
of CN. Casein degradation occurs in the gland during
the intervals between milkings (Le Roux et al., 1995;
Urech et al., 1999). Thus, the differences in aCa
2+ between
the infected and uninfected glands may represent
the additional CN degradation in the infected
glands. The present results further support the conclusion
that measurement of aCa
2+, which is rapid and
cheap, appears to be a valuable tool for monitoring the
extent of CN degradation under various conditions
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