Effect of @entity1460 meal particle size on @entity535 and energy digestibility in grower-finisher XXXX .

@entity1707 @entity1522 @entity1619 @entity6213 @entity535 @entity1853 @entity6778 @entity1460 @entity4857 @entity815
A study was conducted using the ileal digestibility technique with grower-finisher @entity1707 to evaluate the effects of particle size reduction of @entity1460 meal (SBM) on @entity535 and energy digestibility. @entity1460 meal was processed through a hammer mill to achieve average particle sizes of 900, 600, 300, and 150 microm. The treatments included the use of two @entity1460 meal sources and soy protein concentrate. One source of SBM was ground to four different particle sizes (i.e., 949, 600, 389, 185); a second source was a common SBM source used in other trials (i.e., 800 microm). The soy protein concentrate had an average particle size of 385 microm. A low-protein (5% casein) diet was fed to determine endogenous @entity535 losses. This experiment was conducted in a 7 x 7 Latin Square design in two replicates using 14 crossbred barrows ([Landrace x Yorkshire] x Duroc) that averaged 28 kg BW and 60 d of age. Animals were surgically fitted with a @entity1619 at the distal ileum. Treatment diets were fed in meal form, initially at 0.09 kg BW(0.75) and at graded increases at each subsequent period. @entity1707 within replicate were fed a constant quantity of their treatment diet for a 5-d adjustment period followed by a 2-d collection of ileal digesta samples. Apparent and true digestibility of @entity1522 was calculated by use of @entity6213 (0.5%) as an indigestible marker. Apparent digestibility of @entity6778 , @entity1853 , @entity815 , and @entity4857 increased linearly (P < 0.05) as particle size decreased. True digestibility of @entity6778 , @entity1853 , @entity815 , and @entity4857 increased linearly (P < 0.05) as particle size decreased. When the essential @entity1522 were averaged, apparent digestibility increased (P < 0.10) from 83.5% to 84.9% as particle size decreased, whereas, nonessential @entity535 digestibility increased only slightly (P > 0.15). Essential @entity535 true digestibility increased numerically from 91.0% to 92.4% as particle size decreased. Energy digestibility was not affected by particle size (P > 0.15). These results suggest that a reduction in particle size of @entity1460 meal resulted in a small increase in the digestibility of its @entity1522 with the essential @entity1522 being affected more than the nonessential @entity1522 . The largest improvement in digestibility, however, was obtained when the particle size was reduced to 600 microm.
