I visited the quality control room which analyses feed closely. The feed is tested in two main ways, using a shaker (Holmen) and a hardness test (Khal), these ensure that only good quality feed is issued to farms.
I was first shown the hardness test. We took a pellet and placed it in a kahl tester, force was then applied. The results were recorded and this determines the ‘hardness’. I was informed that the hardness should be no less than 8-10 for 6mm>, however bigger pellets at 14mm< will need a result of between 15-25.
The Holmen test determines how well pellets will survive during transportation and being blown into feed silos. We took 100 grams of pellets and placed them into the shaker. After the programme was complete, they were removed, visually checked and weighed. In order for pellets to pass they must not weigh less than 98 grams.