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The Relationship between Certain Blood Components and Rate of Growth in Swine¹

University of Minnesota

Abstract

In experiment I a comparison of red cell counts, hemoglobin, serum protein and catalase activity of 5 inbred lines of swine at different ages was made The level of these blood constituents was found to be higher at 112, days of age than at 84. Significant line differences were demonstrated for red cell counts and catalase adjusted for hemoglobin concentration. Significant litter differences could not be demonstrated but litter differences plus the interaction, agexlitters, were significant for all blood constituents.

In experiment II a study of the relationship of growth rate with hemoglobin and serum protein indicated that these two blood constituents were related to growth up to the time of blood sampling but not with growth following blood sampling. Past growth was a better index of future growth than either of these blood constituents.

¹ Paper No. 2156 Scientific Journal Series of the Minnesota Agricultural Experiment Station in cooperation with the Regional Swine Breeding Laboratory, Ames, Iowa, Bureau of Animal Industry, U. S. Department of Agriculture. Assistance in this work was received from the personnel on W.P.A. Official Project No. 165-1-71-124, Subproject 495, sponsored by the University of Minnesota in 1941. This paper is condensed from Part II of a thesis submitted by the senior author to the Graduate Faculty of the University of Minnesota in partial fulfillment of the requirements for the degree of doctor of philosophy.

² The authors are Associate Professor in the Department of Animal Industry and Range Management, Montana State College; Associate Professor in the Departments of Animal Industry and Experimental Statistics, University of North Carolina; and Professor of Animal Husbandry, University of Minnesota, respectively.