A Prediction of Daily Milk Yield and its Composition from the Morning or the Evening Milking Records

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  • Prediction of Daily Milk Yield and Its Composition from the Morning or the Evening Milking Records

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In the present system of Dairy Herd Improvement Test in Japan, it is necessary to measure milk yield and to take samples both in the morning and in the evening of the day in the presence of a supervisor. In the alternate test method (AT or AM-PM method), daily milk yield and composition were estimated from either the morning or the evening milk. In this study, a multiple regression equation was fitted to estimate daily milk yield and its fat, protein and Solid-Not-Fat (SNF) concentration with three or more variables in the morning milking records. When the milk yield, protein or SNF of a day was made into an objective variable and three or more independent variables relevant to morning milk were included in the equations, 0.95+ coefficient of determination was obtained. Daily milk yield and its protein and SNF were estimated with sufficient accuracy from evening milk as well as morning milk. Validations of the regression equations were performed. The coefficient of determination of the predicted values for daily milk yield, its protein and SNF from the morning milk was 0.95 +. In the same way, 0.95 or more was the coefficient of determination of the predicted values of daily milk yield, protein, and SNF from the evening milk. The differences between the predicted values and the actual measurement values of daily milk yield from morning or evening milk were distributed within 2 (kg) range. The differences in protein and SNF were less than 0.1% in many cases.

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  • 日本畜産学会報

    日本畜産学会報 70 (4), 181-187, 1999

    公益社団法人 日本畜産学会

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