Bioavailable of phosphorus in genetic enhanced soybeans

Five papers were presented on the bioavailability of phosphorus in genetically enhanced soybean meals at the Midwest Section meetings of the American Society of Animal Science in Mid-March. Researcher sat the University of Kentucky and the University of Missouri obtained genetically enhanced soybean from Optimum Quality Grains located in Des Moines, IA. The low-olgiosaccharide and low-phytate soybeans were processed into soybean meal and used in various swine and poultry studies to determine the nutritional improvements of these value-added soybean traits. The various studies indicated that:

• Pigs fed a low-phytate, low-oligosaccharide soybean meal retained significantly more phosphorus (58 and 62%) compared to a normal soybean meal (31%). These results indicated that the relative phosphorus bioavailability in a low-phytate, low-oligosaccharide soybean meal is considerably higher than normal soybean meal. Phosphorus excretion is reduced with these low-phytate, low-olgiosaccharide soybean meals.
  


• In another study, pigs were fed diets containing low-phytate corn and low-phytate, low-oligosaccharide soybean meal or diets formulated on isogenic corn and soybean meal. The results indicated that feeding growing pigs diets formulated with low-phytate corn and low-phytate, low-oligosaccharide soybean meal required less supplemental phosphorus and excreted up to 55 percent less fecal phosphorus than pigs fed typical corn-soybean meal diets.
  


• Based on bone strength and ash weight evaluations the mean relative bioavailability of phosphorus was 19, 49 and 100 percent for the normal soybean meal, low-phytate soybean meal and monosodium phosphate control, respectively. These results indicate that the phosphorus in low-phytate soybean meal is two to three times as bioavailable as the phosphorus in a meal produced from near-isogenetic soybeans for growing pigs.
  


• Pigs were fitted surgically with ileal cannulas to determine the apparent nutrient digestibilities for four soybean meal samples. The digestibilities of phosphorus and gross energy were higher for the low-phytate, low-oligosaccharide soybean meal compared to the commercial or isogenetic soybean meals. Amino acid digestibilities were variable for the four soybean meals with no consistent trends.
  


• Two studies were conducted to determine the affects of low-phytate corn and a low-phytate, low-oligosaccharide soybean meal on nutrient retention and performance of growing pigs. Results indicated no differences between treatments for average daily gain and feed efficiency. The studies supported the previous determined available phosphorus estimates for low-phytate corn and low-phytate, low-oligosaccharide soybean meal. These studies demonstrated that formulating diets with low-phytate corn and low-phytate, low oligosaccharide soybean meal could reduce phosphorus excretion.

Spencer, J.D. and co-workers. 2000. Relative phosphorus availability and retention of low-phytate/low-oligosaccharide soybean meal for growing pigs and chicks. Abstract 207 presented at the Midwestern Section of ASAS and Midwest Branch ADSA 2000 Meeting, Des Moines, IA.

Cromwell, G.L. and co-workers. 2000. Bioavailability of phosphorus in low-oligosaccharide, low-phytate soybean meal for pigs. Abstract 206 presented at the Midwestern Section of ASAS and Midwest Branch ADSA 2000 Meeting, Des Moines, IA.

Cromwell, G.L. and co-workers. 2000. Effects of low-phytate corn and low-oligosaccharide, low-phytate soybean meal in diets on performance, bone traits and phosphorus excretion by growing pigs. Abstract 208 presented at the Midwestern Section of ASAS and Midwest Branch ADSA 2000 Meeting, Des Moines, IA.

Frank, J.W. and co-workers. 2000. Comparison of apparent nutrient digestibility values of normal and low-phytate/low-oligosaccharide soybean meal in growing pigs. Abstract 209 presented at the Midwestern Section of ASAS and Midwest Branch ADSA 2000 Meeting, Des Moines, IA.

Spencer, J.D. and co-workers. 2000. Nutrient retention and growth performance of pigs fed diets formulated with low-phytate corn and/or low-phytate/low oligosaccharide soybean meal. Abstract 211 presented at the Midwestern Section of ASAS and Midwest Branch ADSA 2000 Meeting, Des Moines, IA.