Why urea can be a partial protein substitute in ruminant feeding?

Urea can be a partial protein substitute in ruminant feeding because it provides a source of non-protein nitrogen (NPN) that rumen microbes can convert into microbial protein. This microbial protein is a high-quality protein that ruminants can utilize effectively. Urea is cost-effective compared to traditional protein sources and helps meet the nitrogen requirements of the rumen, promoting better digestion and nutrient absorption. However, it must be used carefully to avoid toxicity and ensure a balanced diet.