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The effect of expander processing and pelleting on the nutritive value of feed for growing and finishing pigs
Author(s) -
O'Doherty J V,
McGlynn S G,
Murphy D
Publication year - 2000
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/1097-0010(20010101)81:1<135::aid-jsfa791>3.0.co;2-f
Subject(s) - pellet , pellets , meal , food science , dry matter , chemistry , zoology , organic matter , biology , paleontology , organic chemistry
Two experiments were conducted to determine the effect of pelleting and/or expander processing on the nutritive value of feed when fed to growing and finishing pigs. Experiment 1 determined the effects of pelleting and/or expander processing on the apparent nutrient digestibility of the diets. In experiment 2, productive performance and carcass characteristics were determined in group‐fed pigs ( n = 312) offered identical diets in raw pellet form (T1), expander‐processed pellet form (T2), raw meal form (T3) and expander‐processed meal form (T4). The expanded diets were expander processed at 105 °C for 5 s at 35 bar pressure. The pellet diets were steam pelleted at 85 °C into 3.0 mm pellets. Pelleting of the diets increased organic matter ( P < 0.05), protein ( P < 0.01), energy ( P < 0.01) and ash ( P < 0.01) digestibility as well as the digestible energy (DE) content of the diets ( P < 0.01). Expander processing had no effect on the organic matter, protein and energy digestibility of the diets. There was a significant interaction ( P < 0.05) between pelleting of the diet and expander processing in DE content of the diets. Expansion had no effect on the DE content of the pelleted diets; however, expansion increased the DE content of the meal diets ( P < 0.05). In experiment 2 there was a significant interaction between the physical form of the diet and expansion in feed intake during the grower and finisher period ( P < 0.01). Expander processing had no effect on feed intake in the pelleted diets; however, expansion decreased feed intake of the meal diets ( P < 0.001). Both pelleting and expansion of the diets decreased growth rate during the grower and finisher period ( P < 0.05). Pelleting of the diets improved feed conversion ratio (FCR) during the grower and finisher period ( P < 0.05), while expander processing had no effect on FCR. © 2000 Society of Chemical Industry