Interpretation of Forage Analysis Reports
نویسنده
چکیده
Forage analyses are a valuable tool for determining the economic value of forages and for formulating efficient and profitable rations. To be useful, forage analyses must be determined accurately and interpreted correctly. The sample submitted must truly represent the feed being analyzed and the forage analyses must provide information that is relevant. There are reliable and repeatable methods for measuring moisture, protein, fiber, total ash, fat, and mineral concentrations in feeds. However, forage quality depends upon more than the concentration of nutrients. The true nutritive value of a forage is related to the performance of the animal that consumes it. Thus, forage quality is determined not only by the amount of nutrients it contains, but also by feed-animal interactions associated with intake, digestibility, and metabolic efficiency. Intake, digestion and utilization by the animal cannot be measured routinely; therefore, laboratories use equations that are based on chemical composition to estimate these important attributes of the feed. In situ and in vitro methods can be used to estimate digestibility, but results are often variable. Research is needed to obtain in vivo intake and digestibility observations using lactating dairy cows that can be used to calibrate and evaluate equations and methods for estimating the digestibility and intake of feeds.
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