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Effects of Corn and Soybean Meal Particle Size on Phosphorus Use in Turkey Poults

Department of Animal Science, Michigan State University, East Lansing, Michigan 48824

Correspondence: K. D. Roberson, E-mail: robers22{at}msu.edu

Two 28-d experiments were conducted to evaluate the effect of grinding corn or soybean meal (SBM) to various particle sizes on P utilization in turkey poults. Dietary Ca was formulated to be 1.20% in the corn-SBM-based diets of both studies and nonphytate P (NPP) was calculated to be 0.40% in experiment 1 and 0.48% in experiment 2. In experiment 1, corn that had been processed through a roller mill was used or was ground through 3 different screen sizes in a hammer mill to yield 4 corn particle sizes ranging from about 600 to 1,100 µm. Initial (7 d) growth was reduced when the coarsest corn was fed due to lower feed intake. Phosphorus utilization was improved the first 2 wk as corn particle size increased as measured by incidence of rickets, tibia ash, and total P retention. Gizzard weight and phytate P retention were increased at 28 d as corn particle size increased. In experiment 2, corn was ground to approximately 850 µm and commercial SBM (856 µm) was used or ground to 2 finer particle sizes in a hammer mill. Gizzard weight and phytate P retention were increased at 28 d as SBM particle size increased. Other parameters were not affected at least partially due to the higher dietary NPP level fed to prevent severe rickets observed in the first trial. These studies show that young poults can utilize P better from coarser corn and soybean meal, especially when dietary P is low.

Key Words: corn • particle size • phosphorus • poult • soybean meal • turkey

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				C. M. Amezcua and C. M. Parsons Effect of Increased Heat Processing and Particle Size on Phosphorus Bioavailability in Corn Distillers Dried Grains with Solubles Poult. Sci., February 1, 2007; 86(2): 331 - 337. [Abstract] [Full Text] [PDF]