One hundred primiparous sows were usedto determine the effects of corn particle size in lactation diets on sow and litter performance. Sows were fed com-soybean mealbased diet with the com ground to 1,200,900, 600, or 400 JLm. Particle size of cornhad no influence on sow weight or backfatloss, or piglet survivability. However, feedintake and digestibilities of DM, N, and GEwere increased (6, 5, 7, and 7%, respectively) as particle size was reduced from 1,200 to 400 JLm. The combination ofincreased feed intake and improveddigestibilities resulted in increased intake of digestible nutrients. DE intake was increased 14% (13.72 to 15.60 Mcal/d) as com particle size was reduced from 1,200 to 400 JLm. Intakes of digestible DM and N were alsoincreased (11 and 14%, respectively). Theincreased intake of digestible nutrients resulted in a 11% increase in litter weight gain. Reducing particle size increased severity of keratinization and lesions in the esophageal region of the stomach although all treatment averages were low to moderate, and the change was not associated with reduced sow performance. In conclusion, our data indicate that nutrient intake of sows and litter weight gains can be increased by grinding corn for lactation diets to particle sizes of 600 to 400 JLm.
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