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Comparison of Radioimmunoassay and Gas-Liquid Chromatography Analyses of Progesterone Concentrations in Cow's Milk 1

Summary Progesterone concentrations in milk were not significantly different when quantitated by different methods (RIA vs. GLC). There was a significant day effect (P < 0.05) on milk progesterone level due apparently to gradually decreasing values as pregnancy advanced over days 30, 120 and 210. The means for the percent fat content were different (P < 0.05) for all comparisons among four times of collection (immediately premilking, milking pool, immediately postmilking, and 3 hr postmilking). For progesterone concentration, the main effect of time and the three-way interaction (time × antiserum × purification method) were significant (P < 0.005); all other main effects and interactions were not significant. Within each of 4 assay groups (2 antisera × 2 purifications), the concentration of progesterone was greater (P < 0.05) for the samples which were collected immediately postmilking than for any of the other times of collection. The three-way interaction seemed due primarily to difference in progesterone determinations among the four assay groups in the samples which were taken immediately postmilking. Over all milk samples within each assay group, the percent fat content and the concentration of progesterone were positively correlated (r = 0.71, P < 0.01). Thanks are due to Donna Mears for her assistance in sample handling and RIA procedures. Also, the valuable technical assistance of Mr. Don O' Brien on the GLC equipment is gratefully acknowledged. Special thanks are due to Dr. M. Garcia for help with the statistical analysis.