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Prediction of the Energy Value of Ewe Milk from Amount and Composition Characters¹

Department of Animal Science, The Pennsylvania State University, University Park 16802

ABSTRACT

Multiple regression analyses determined the relationship among certain independent variables (milk production, freezing point and total solids, fat and protein percentages) and kilocalories per gram and total 3-hour milk kilocalories. The most practical equation for predicting kilocalories in milk is: Kcal/g = –.33550 + 0.08641 (total solids, %), due to the relatively small standard error of estimate (0.054 kcal/g), high multiple correlation (0.94) and the ease with which total solids is determined. For predicting total 3-hour milk kilocalories, the most practical and accurate equation is: Total kcal = –308.10456 + 1.22524 (3-hour production, g) + 16.51300 (total solids, %), with a relatively small standard error of estimate (21.83 kcal) and high multiple correlation (0.97).

¹ Published with the approval of the Director, Pennsylvania Agricultural Experiment Station, No. 3790 of the Journal Series.