Gesamtproteinwert

Gesamtproteinwert, often translated as total protein value, is a term used in animal nutrition to describe the sum of all protein and non-protein nitrogen (NPN) compounds that can be utilized by an animal. This measurement is crucial for formulating balanced animal diets, particularly for ruminants like cattle and sheep, as it accounts for the nitrogen that microorganisms in the rumen can convert into microbial protein.

The Gesamtproteinwert includes true proteins, which are made up of amino acids, and non-protein nitrogen sources such as urea, biuret, or ammoniated compounds. While NPN sources are less expensive than true protein, their effective utilization depends on the presence of adequate fermentable carbohydrates in the rumen to support microbial growth. Without sufficient energy, NPN can be inefficiently converted or even lead to ammonia toxicity.

In practice, nutritionists use the Gesamtproteinwert to ensure animals receive sufficient nitrogen for protein synthesis. However, it's also important to consider the amino acid profile of the true protein portion and the availability of digestible NPN. The Gesamtproteinwert provides a broader picture of nitrogen availability than simply measuring crude protein, offering a more nuanced approach to dietary formulation for optimal animal health and productivity. It is a concept primarily encountered in European animal nutrition literature.