Cereal milling has great impact in pig health and production costs. Pig feed costs account for 65-80% of total production costs (Jensen, 1976). This has led producers to take advantage of feed manufacturing practices to maximise the use of raw materials.
Properly managed, the increase in the cost associated with the manufacture of feed translates into an improvement in the performance of pigs.
Good manufacturing practices are essential to ensure a low cost-benefit ratio.
Not only is it important to fully understand each processing method and its effects, but you also need to understand how processing influences:
feed handling characteristics
production costs
the digestibility of nutrients and energy
and pig yield
Grains are the main ingredient in pig feed susceptible to grinding. Other ingredients are pre-processed and arrive at the feed mill under acceptable conditions.
There are two types of mills commonly used to reduce the particle size of ingredients, roller mills and hammer mills.
Roller mills
Roller mills reduce particle size by crushing or grinding, thanks to the application of a compressive force on the ingredient.
This process produces a small amount of fine material resulting in a relatively uniform particle size of the grain.
Hammer mills
Hammer mills reduce the particle size of ingredients by impact grinding (Pfost, 1976), resulting in particles with a more spherical shape and increasing the amount of fine, pulverized particles, resulting in a less uniform particle size (Koch, 2002).
Previous studies have shown that the increase in the amount of non-uniform particles generated by the use of hammer mills results in a greater angle of fall, which translates into a worse fluidity (Groesbeck et al., 2006).
Costs asocciated with milling
On the other hand, in addition to reducing handling characteristics, grinding grains increases the costs associated with milling. These costs include:
The initial cost of equipment may seem expensive, but depending on the mill, energy costs for a year may exceed the costs of a new piece of grinding equipment. Understanding the variety of factors that influence the efficiency and production rate of milling can be very beneficial for feed manufacturers.
The energy required for the operation of a roller mill or hammer mill over its entire service life will be 10-20 times greater than the cost of the machine alone (Heimann, 2014).
Some data shows that reducing the particle size of cereal grains le...
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