Nutrient balance in the diet of grazing dairy cows
1993
Kellaway, R.C. | Tassell, T.J. (Sydney Univ., Camden (Australia). Dept. of Animal Science) | Havilah, E. (New South Wales Agriculture, Berry (Australia)) | Sriskandarajah, N. | Andrews, A. (Western Sydney Univ., Richmond (Australia))
A method is described for estimating the nutrient content of pasture selected by grazing cows. The method is non-invasive and suitable for use on commercial farms. Results from use of the method are reported for studies on a commercial farm over a period of 29 months. Confidence limits were calculated for estimated nutrient contents of pasture eaten. Estimated nutrient contents then were compared with recommended nutrient contents for high-yielding cows. Significant deficiencies of energy, protein, Ca, P and Na were common. Seasonal trends in nutrient content of pasture eaten are reported, together with selection differentials between pasture eaten and pasture available
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