Fig. 1. Nitrogen fertilization effects on crude protein (CP) fraction concentrations in total CP of rye–ryegrass herbage. There was a linear increase in Fraction A (P < 0.01, SE = 28), and a linear decrease in Fraction B (P < 0.01, SE = 23) and Fraction C (P < 0.05, SE = 12) as N fertilization level increased.