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Errors in Drying Silage and Feces for Protein and Energy Determinations. Improved Procedures¹

New Hampshire Agricultural Experiment Station, Durham

ABSTRACT

Livestock men, dairymen in particular, realize that one of the keys to profitable production is the maximum use of high-quality forage, harvested at the proper stage of maturity and stored so as to reduce as much as possible the nutrient losses which result from poor methods of handling and adverse curing weather. Because the making and feeding of silage, both corn and grass, appear to be a good solution to this problem, the nutritive evaluation of silages has become increasingly important in recent years.

The two principal criteria of the nutritive value of a silage are its digestible protein content and its digestible energy content. To arrive at these two values, one must determine the protein and the energy contents of both the silage fed and feces produced. Protein usually is determined on dried samples of silage, and feces by the Kjeldahl method, although a few workers have used fresh material.

¹ Published with the approval of the Director of the New Hampshire Agricultural Experiment Station as Scientific Contribution No. 185.

² Dairy Husbandry Department.

³ Agricultural and Biological Chemistry Department.