September 2012

Editor's Note

The current issue of the newsletter contains the following:

  • Two research reports: one on phosphorus digestibility in oilseed products, and one on energy digestibility in reduced-fat DDGS.

  • A press release on phosphorus digestibility in fermented soybean meal.

  • The latest publication from the Stein Monogastric Nutrition Laboratory.

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Hans H Stein

Research Reports

Phosphorus digestibility in canola, cottonseed, and sunflower products fed to growing pigs

Soybean meal is a high quality source of protein for swine diets. Due to the growth in global production of pigs and poultry, demand for soybeans is increasing rapidly, outpacing production. Therefore, other sources of plant protein are sometimes used in diets to supply indispensable amino acids to the animals.

The most abundant oilseeds produced in the world, aside from soybeans, are cottonseed, canola seed (rapeseed), and sunflower seed. These oilseeds may be fed as de-oiled meals, or the full fat seeds can be fed to increase the energy concentration of the diet.

Oilseeds and oilseed meals also provide phosphorus to the diet. However, most of the phosphorus in these sources is bound to phytate, and is not available to pigs. An experiment was performed to determine the standardized total tract digestibility (STTD) of phosphorus in canola, cottonseed, and sunflower products, and to discover how the addition of phytase influences the STTD of phosphorus. The apparent total tract digestibility (ATTD) of calcium and the effect of adding phytase on ATTD of calcium were also measured.

(Read more ...)

Effect of fat concentration in distillers dried grains with solubles on concentrations of digestible and metabolizable energy when fed to growing pigs

Distillers dried grains with solubles, or DDGS, is a co-product of the rapidly growing ethanol industry. DDGS has been increasingly used for swine diets because of its affordability and nutritive value. Corn DDGS is high in energy, amino acids, and digestible phosphorus.

In the last few years, more ethanol plants have started  to use centrifugation to extract oil from DDGS for use in the production of biodiesel. The resulting DDGS products contain less fat than conventional DDGS. Reduced-fat DDGS products would be expected to have decreased digestible (DE) and metabolizable (ME) energy concentrations compared with  conventional DDGS, but energy values for these products have not yet been reported.

(Read more ...)

Press release

Meeting pigs' phosphorus requirements with fermented soybean meal

URBANA – Fermented soybean meal (FSBM), considered a promising substitute for fish meal in weanling pig diets because of its protein content, lower cost, and lack of anti-nutritional factors, may have an additional advantage. University of Illinois researchers recently found that pigs digest the phosphorous in FSBM better than the phosphorus in conventional soybean meal.

(Read more ...)


Rojas, O. J. and Stein, H. H. 2012. Nutritional value of animal proteins fed to pigs. Pages 9-24 in Proc. Midwest Swine Nutr. Conf. Indianapolis, IN, Sep. 13, 2012.