Estimating Solids-Not-Fat and Protein in Milk from Different Sources Using Percentage Milk Fat, Protein, and Solids-Not-Fat

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Abstract
Standard errors of estimate (sy.x) for within breed when using percent milk fat to estimate percent solids-not-fat were 0.53, 0.25 and 0.17% SNF, respectively, for monthly samples from individual cows, lactation average and two-day composites of herd milk; when percent protein was used to estimate percent SNF, Sy.x were, respectively, 0.47, 0.19 and 0.14% SNF. Percentage milk fat and percent SNF (gravimetrically determined) were compared for indirectly estimating percent protein. The within breed Sy.x for monthly samples from individual cows, lactation averages, and two-day composites of herd milk were, respectively, 0.32, 0.16, and 0.17 for percent milk fat and 0.29, 0.14 and 0.15 for percent SNF.