Feeding extruded products is the norm in the pet and aqua feed industries, yet it remains unusual for swine feed in the United States and in Canada.
The technology can improve energy and protein digestibility in pigs, according to research from the University of Illinois.
“We’re not doing this much in the U.S., partly because the extrusion equipment typically is not installed in feed mills producing pig feeds. If a feed company decided they wanted to extrude diets or extrude grain by itself, as we did in this case, it would add cost. So the only way it would be economical would be if the pigs performed better with extruded grains,” says Hans H. Stein, professor in the Department of Animal Sciences and the Division of Nutritional Sciences at Illinois and co-author on a study in Animal Feed Science and Technology.
Stein and his team compared pig diets containing either extruded or unprocessed corn, wheat, and sorghum to determine ileal starch and amino acid digestibility, as well as total tract digestibility of energy and fibre.
One source of each grain was ground and then divided in two batches, with one batch left as is and the other extruded in a single-screw extruder with an exit temperature of 100 C.
Grains were ground and extruded at Kansas State University.
“In extruded corn and wheat, we saw a nice improvement in amino acid digestibility, corn in particular,” Stein says. “And we observed increases for energy in extruded corn and sorghum, but not in wheat.”
Starch digestibility also increased in extruded grains, compared with unprocessed grains.
“Starch is already well digested by pigs, but by extruding it, we increase its digestibility even more. And we have seen in quite a few other experiments, every time we increase starch digestibility, we increase energy digestibility,” Stein says. “There’s a very, very close relationship between the two.”
The mechanical process of extrusion, which involves heat, pressure, and steam, leads to gelatinization of starch, which explains the link between starch and energy digestibility.
“In the extruded grains, 90 per cent of the starch was gelatinized,” Stein says. “Gelatinization opens the starch molecule, making it easier for enzymes to break down every bond within the starch. That leads to greater energy digestibility and absorption.”
Fibre digestibility didn’t change markedly in extruded grains versus unprocessed grains, but more of the fibre content became soluble with extrusion. “That means some of the insoluble fibers were solubilized. But because fibre digestibility didn’t increase overall, that didn’t have as much of an impact as we had expected,” Stein says.
With pigs extracting more energy and protein from extruded grains, Stein sees a potential economic benefit that could justify the cost of adding extruding equipment to feed mills.
“If feed manufacturers can increase the energy as much as we did in our study, then there certainly is value in extruding grain for pig diets,” he says.