Most fast growing, immature green plants are high in nitrogen and low in energy and this causes performance problems.
The more rain, the more fertilizer, and the less sunlight intensity and hours exposure, the more this is true. The less mature the plant, the more this is true.
Most of the excess nitrogen is in the form of non-protein nitrogen (such as urea), and not true protein. NPN requires excellent rumen microbial function and high levels of starch energy for protein synthesis to take…