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Influence of micronization (fine grinding) of soya bean meal and fullfat soya bean on productive performance and digestive traits in young pigs

Soya bean meal and fullfat soya bean micronization does not improve piglet performance and digestibility of dietary components
5 October 2009
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The aim of the present experiment was to compare the effect of reducing mean particle size of soya bean meal (SBM) and full fat soya beans (FFSB) through micronization on growth performance, digestibility of dietary components and digestive traits of young pig. The hypothesis tested was that piglet performance could be similar for both soya protein sources and that micronization could increase digestibility of dietary components of both soya protein sources, thereby improving FCR.

Two different trials were conducted. The mean particle size (MPS) was 47 and 881 µm for the SBM and 41 and 778 µm for the FFSB, micronized and ground, respectively. In exp 1 a total of 120 piglets were selected the day of weaning. Pigs weighed and allotted to the experimental units according to sex and BW. There were four treatments and five replicates of six piglets per treatment. Animals had free access to feed and water throughout the trial and were individually weighed at 23, 33 and 45 days of age. Growth traits from 23 to 45 days of age and the coefficient of total tract apparent digestibility (CTTAD) of dietary components at 33 and 45 days of age were assessed. In the Exp 2, a total of 24 piglets, were used. Pigs were individually housed in digestibility cages. There were four treatments and six replicates of one pig each per treatment with all treatments having similar initial BW. On day 45 of the experiment, all the animals were euthanatized for sample collection. The stomach, intestines, pancreas, liver and spleen of all pigs were excised, cleaned, dried and weighed. The weight of the empty organs was expressed relative to live BW (g/kg). In addition, the small intestine was separated into three sections: duodenum (first section, about 1.5 m), jejunum (second section, about 2.0 m) and ileum (remaining section). The coefficient of ileal apparent digestibility (CIAD) of dietary components, the pH of the gastro intestinal tract (GIT) and the weight of digestive organs and spleen were measured at 45 days of age.

From 23 to 33 days of age pigs fed SBM grew faster (253 g/d versus 213 g/day; P<0.05) and were more efficient (0.87 g/g versus 0.98 g/g; P<0.01) than pigs fed FFSB. For the entire experiment (23–45 days of age) pigs fed SBM tended to grow more (360 g/day versus 324 g/day) and to eat more feed (414 g/day versus 380 g/day) than pigs fed FFSB.

Dietary treatment did not affect the pH of the different segments of the GIT. Pigs fed SBM had heavier pancreas (2.3 g/kg versus 1.9 g/kg BW; P<0.05) and liver (35.9 g/kg vs 32.7 g/kg BW; P<0.01) than pigs fed FFSB. The MPS of the soya protein source did not affect organ weight (P>0.10).

Productive performance and digestibility of dietary components were higher in pigs fed diets based on soya bean meal than in pigs fed diets based on fullfat soya bean. Reducing the mean particle size of soya bean meal and fullfat soya bean by micronization did not have any beneficial effect on piglet performance and digestibility of dietary components

DG Valencia, MP Serrano, R Lázaro, MA Latorre, GG Mateos. 2008. Animal Feed Science and Technology. 147: 340-356

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