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Kansas State University, Manhattan 66506
Abstract
The effects of a steam-pelleted corn-soybean meal diet on the performance of 146 pigs were examined. Pelleting variables were closely monitored during processing. Treatments included (1) mash, (2) mash with 2.5% molasses replacing corn, (3) dry-pelleted mash, (4) steam-pelleted mash and (5) mash with 2.5% liquified corn. Growth and digestibility trials were conducted with weanling (8.5 kg) and grower-finisher (48.0 kg) pigs. Steam conditioning before pelleting made pellets more durable and resulted in less starch damage and less consumption of electrical energy than did dry pelleting. Steam acted as a lubricant between the mash and die hole surface. More than 70% of the energy required for steam pelleting was used to generate steam. None of the processing methods studied improved (P<.05) weanling pigs' average daily gain (ADG), feed intake, feed:gain ratio or energy digestibility. Protein digestibility was lower (P<.05) with the steam-pelleted diet than with the mash diet. Grower-finisher pigs fed either pelleting treatment showed improvement (P<.05) in feed:gain ratio and energy digestibility over those fed the mash diet. However, ADG was not increased (P<.05). Animal performance was not improved by the substitution of liquified corn or molasses in either growth study. Pigs preferred pelleted to mash diets and dry to steamed pellets.
1 Contribution no. 80-38-J, Dept. of Grain Sci. and Ind., Kansas State Univ., Manhattan 66506.
2 Carnation Co., Kansas City, MO 64126
3 Ralston Purina, Inc., St. Louis, MO 63188
4 Dept. of Grain Sci. and Ind.
5 Dept. of Anim. Sci. and Ind.
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