Dr. Pope was using Quantum Blue.
2. How do you find a happy medium between protecting your enzymes but still producing a durable pellet, and what is a reasonable PDI in the USA?
The feed mill needs to test for enzyme stability under the most severe normal operating parameters used in the feed mill to determine if the enzyme is stable. The feed mills also need to collect data on the Hot Pellet Temperature not just conditioning temperature. In the US, the poultry and swine integrator does not focus on PDI but instead monitors fines at the feeder of the birds and pigs. As a general rule the poultry producers would like to have less than 40-50% fines at the feeder and the swine integrators would like to have less than 20-30% fines at the feeders. Very little swine and poultry feed is manufactured by commercial mills therefore the focus is on animal performance rather than customer (human) satisfaction.
Pellet enhancers or pelleting aids may help if they lower the Hot Pellet Temperature.