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Importance of Initial Blood and Plasma Values

Minnesota Agricultural Experiment Station, St. Paul and Oklahoma Agricultural Experiment Station, Stillwater

Abstract

The records of individually fed lambs from 13 nutritional experiments were examined to determine the relationships among initial levels, final levels and changes for nine blood and plasma variables. Correlations between initial and final levels of hemoglobin, hematocrit, plasma protein and plasma vitamin A were 0.38, 0.41, 0.39 and 0.39. All other initial-final correlations were less than 0.20. These correlations indicate that change is not a sensitive estimator of treatment effects. Statistical evidence is presented to support the recommendation that covariance analyses should be used for blood and plasma data where both initial and final levels have been measured.

¹ Department of Animal Science, St. Paul.

² Present address: Department of Genetics, Cambridge University, England.

³ Department of Animal Science, Stillwater.