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Relationship Between Milk Production and Mammary Gland Indices of Guinea Pigs¹

Department of Dairy Science, University of Missouri, Columbia 65211

² Send reprint requests to R. R. Anderson.

ABSTRACT

Regression analysis related simulated production to simulated wet weight of mammary gland, weight of dry fat-free tissue, deoxyribonucleic acid content, and ribonucleic acid content for the first 21 days of lactation of the guinea pig. Coefficients of determination were .52 for wet weight, .03 for dry fat-free tissue, .84 for deoxyribonucleic acid, and .20 for ribonucleic acid. Coefficients of determination were larger when ascending and descending phases of lactation were considered separately. Milk production per unit mammary wet weight, dry fat-free tissue, deoxyribonucleic acid, and ribonucleic acid were related to day of lactation by an equation of the form Y = aX^be^cX, where Y was milk production per unit mammary gland growth, X was day of lactation, e was the base of natural logarithms, and a, b, and c were constants. Efficiency of milk production, defined as milk production per unit mammary size, increased with increasing milk yield.

¹ Contribution from Missouri Agricultural Experiment Station Journal Series No. 9247. Approved by the Director.