Table 2 shows that 1 kg of QPM contains less leucine than 1 kg of normal maize. Suggest why a diet containing less leucine does not slow down the growth of chickens.

The information provided states that "Essential amino acids are amino acids the chicken cannot make." and "A chicken can make many of the 20 amino acids from other substances in the diet." Leucine is listed in the table, but the fact that a lower amount in the diet does not slow growth suggests that either: 1. Leucine is not an essential amino acid for chickens. This means the chicken's body can synthesise the leucine it needs from other molecules, so the amount in the diet is less critical. 2. The amount of leucine in QPM (88.1 g/kg), while lower than in normal maize, is still above the minimum amount required by the chicken for healthy growth.