Unit 2 - Ingredient & Feed Processing Flashcards
One micron is equivalent to __________ of a meter
1/1,000,000
What is the optimal micron size for corn?
650-750
What happens if feed is ground too finely?
Can lead to bridging and stomach ulcers in pigs
How does a hammer mill work?
Grain is fed through the top chamber through a set of rotating hammers that smash the grain against a screen
How does a roller mill work?
Grain is fed through the top through a series of paired rollers.
What is better hammer mill or roller mill?
Roller mill has more consistent particle size but it is more expensive.
In a new or well-take care of horizonal mixer, mixing takes __________ minutes
3-5 minutes
What is a good target for variability in feed mix?
10% variability or less
What is the order of ingredients you would add into a mixer?
- ~50% of cereal grains
- Low-concentration ingredients
- Protein ingredients (ie. soybean meal)
- Remaining cereal grains
- Liquid ingredients
What is a mash?
A dry mixture of ground products
What is pelleting?
Converting mash into a pellet using heat, pressure, and steam. Conditioning chamber adds steam, then it passes to pelleting chamber.
What is extrusion?
Converting mash into kibble using pressure and water. Ingredients are blended together with water into a slurry, water is then removed and forced through a die.
