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The effect of expander processing and pelleting on the nutritive value of feed for growing and finishing pigs

✍ Scribed by J V O'Doherty; S G McGlynn; D Murphy

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
101 KB
Volume
81
Category
Article
ISSN
0022-5142

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✦ Synopsis

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 ®nishing 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 signi®cant 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 signi®cant interaction between the physical form of the diet and expansion in feed intake during the grower and ®nisher 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 ®nisher period (P 0.05). Pelleting of the diets improved feed conversion ratio (FCR) during the grower and ®nisher period (P 0.05), while expander processing had no effect on FCR.

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