Optimising soy protein concentrate use in pig diets
Recent trials set out to determine the effect of particle size of soy protein concentrate on amino acid digestibility and concentrations of digestible and metabolisable energy of pigs. Whether soy protein concentrate has an effect on growth performance of weanling pigs was also explored.
By Chengfei Huang, Hans Stein and Gloria Casas* I 32 PIGLETS - JULY/AUGUST 2016
nclusion of soybean meal in diets for weanling pigs is commonly limited because of the negative effects of anti-nutritional factors, such as glycinin, beta-congly- cinin and trypsin inhibitors. However, further process- ing of soybean meal may result in a reduction of anti-
nutritional factors, and therefore, increased quantities of pro- cessed soybean protein may be included in starter diets for pigs. Soy protein concentrate (SPC) is produced by removing the soluble carbohydrates and non-protein constituents from defatted soy flakes. A reduction in particle size of soybean meal to 185 μm may increase the digestibility of most amino acids (AA). Likewise, increased digestible energy (DE) and metabolisable energy (ME) have been reported for corn if the particle size is reduced. However, to our knowledge there are no data about the effects of reduction of particle size of SPC on digestibility of AA and energy.
Trial set-up Therefore, three experiments which received financial support from Selecta, Brazil, were conducted to evaluate the effect of particle size of SPC on digestibility of AA and concentrations of DE and ME. The second objective was to determine the effects on growth performance and blood parameters of including SPC in diets fed to weanling pigs. In the first experiment, the standardised ileal digestibility (SID) of crude protein (CP) and AA in soybean meal, fish meal, and three sources of SPC was determined. The three sources of SPC were ground to 70 μm, 180 μm and 2 mm (SPC-80, SPC-200, and SPC-600, respectively). The second experiment was designed to determine the apparent total tract digestibility (ATTD) of gross energy and the concentration of DE and ME
PHOTO: FERNANDO BRANCO
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