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Department of Animal Husbandry, Cornell University, Ithaca, New York
ABSTRACT
The quantification of lactation response requires that various yields of milk of various chemical compositions he equated to a common term. Although the gross energy value is the most common characteristic to which all organic substances can be reduced, its direct measurement is expensive. As a consequence, a study was made of the relationships among the energy value and the concentrations of total solids, solids-not-fat (SNF), fat, protein, lactose, and ash in 600 two- and seven-day composite samples of milk from 42 Holstein cows and ranging from 1.6 to 6.4% fat. An analysis of 21 different combinations of milk components showed that the most practical equation for the accurate prediction (C.V. = 1.3%) of the energy value of milks having a wide range of chemical composition is:
Energy (kcal/lb) = 41.84 (% fat) + 22.29 (% SNF) – 25.58. From this, the following equation was derived to compute the solids-corrected milk (SCM) yield containing 340 kcal of energy per pound: SCM (lb) = 12.3 (F) + 6.56 (SNF) – 0.0752 (M); where F, SNF, and M are expressed as pounds of fat, solids-not-fat, and milk, respectively. This equation predicted the milk energy output of cows producing low-fat milk effected by dietary means as accurately as that of normal milk. The Gaines 4% FCM equation underestimated by as much as 15% the energy output in milk containing less than 3% of fat.
1 This investigation was supported in part by a research grant (AM-02889) from the National Institute of Arthritis and Metabolic Diseases, U. S. Public Health Service and research grants from the Cooperative Grange League Federation, Inc., Ithaca, New York, and the Eastern States Farmers' Exchange, Inc., Springfield, Massachusetts.
2 The data reported here are a part of those presented in the Ph.D. degree thesis by H. F. Tyrrell to the Graduate School, Cornell University, 1965.
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