U. S. Department of Agriculture has increased the soybean 2008/09 crop year exports by 50 million bushels to 1.150 billion as export shipments continue to exceed earlier projections, primarily to China. The soybean crush was reduced by 35 million bushels to 1.650 billion reflecting a continuation of the weak domestic soybean meal disappearance rate that began during the summer of 2008. They project the soybean meal price will be $265 to $305 per short ton during the balance of the 2008/09 crop year.
Global soybean production is estimated at 224.1 million tons for the 2008/09 crop year. The reduced prospects are due to the South American crops which have been affected by hot, dry weather during critical parts of the growing season.
In the next Soybean Meal INFOcenter newsletter, we will provide detailed information on the prospective soybean planting for the 2009 growing season. Soybean farmers are in their final planning process that determines the acreages for the various crops. USDA will survey the farm community in early April and provide preliminary estimates of the 2009/10 crop year. These values will be discussed in the next newsletter.
Factors Affecting Phosphorus Utilization in Feed Ingredients
A study was conducted to evaluate effects of feeding low phytic acid (LPA) corn, LPA soybean meal, normal corn (NC), normal soybean meal (NSBM), and phytase on nutrient digestibility and excretion. Barrows weighing about 45kg were randomly assigned to 1 of 8 dietary treatments in a 2 x 2 x 2 factorial arrangement (6 pigs/treatment). Phytase was added to the diet at 510 FTU/kg of feed, at the expense of corn starch, and all diets were formulated to provide 0.39% total phosphorus (P), 0.50% calcium, and 1.0% lysine with no supplemental inorganic phosphorus. Pigs were adapted to metabolism crates and dietary treatments for 7 days followed by a 3-day total collection of urine and feces. Total fecal DM excreted, % DM of feces, and % DM digested were not different among treatments. Fecal phosphorus excretion was reduced for pigs fed:
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LPA corn vs. NC
LPA soybean meal vs. NSBM
Phytase vs. non-phytase diets
LPA ingredient & phytase vs. the control diet |
(2.85 vs. 3.24 +/- 0.119 g/d; P = 0.024)
(2.79 vs. 3.30 +/- 0.119 g/d; P = 0.007)
(2.80 vs. 3.29 +/- 0.119 g/d; P = 0.009)
(2.16 vs. 3.70 +/- 0.237 g/d; P < 0.001) |
Phosphorus digestibility was increased for pigs fed diets containing: |
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LPA corn vs. NC
Phytase vs. non-phytase diets
LPA soybean meal vs. NSBM
LPA ingredients & phytase vs. the control diet |
(48.4 vs. 39.9 +/- 2.27%; P = 0.012)
(48.4 vs. 39.9 +/- 2.27%; P = 0.019)
(47.2 vs. 41.1 +/- 2.27%; P = 0.075)
(60.1 vs. 34.1 +/- 4.50%; P < 0.001) |
The low phytic acid corn and soybean meal had no effect (P > 0.11) on water-soluble phosphorus excretion. However, pigs fed diets containing phytase tended to excrete less total water soluble phosphorus than those without phytase inclusion (1.99 vs. 2.27 +/- 0.099 g/d; P < 0.066). This study demonstrates that the feeding of any combination of LPA corn, LPA soybean meal, and phytase was additive, significantly improved phosphorus digestibility and dramatically decreased phosphorus excretion to reduce the potential impacts of phosphorus from pig manure on the environment.
Hill, B.E. and co-workers. 2008. Effects of low-phytic acid corn, low-phytic acid soybean meal, and phytase on nutrient digestibility and excretion in growing pigs. J. Animal Sci. published on line November 21.
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