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2. Relation between percentage fat content and yield of milk;Gaines;Univ. I11. Agr. Exp. Sta. Bull.,1923
3. Berechnungen zum Energiegehalt der Kuhmilch;Gut;Züchtungskde,1987
4. Methods for calculation of the energy content of milk;Sjaunja,1984
5. Prediction of the energy value of cow's milk;Tyrell;J. Dairy Sci.,1965