Clinical Biochemistry of Domestic Animals (Sixth Edition) - UMK ...

References
657
for storage at room temperature for about 3 weeks and for
several months if the milk is stored at 4 to 5°C ( Nachreiner
et al. , 1992 ). There is a difference in progesterone content
among fore milk, composite milk, and strippings because
of the variation in milk fat content ( Fig. 21-11 ) ( Garcia and
Edqvist, 1990 ). This difference is less obvious when using
skim milk for the immunoassay of progesterone, but the
temperature must be controlled at centrifugation because
warm butterfat will absorb progesterone more readily than
cold butterfat ( Nachreiner et al. , 1992 ). A common recommendation
for sampling of milk for analyses of progesterone
is to obtain strippings after milking.
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