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The GMD of the diet did not affect productive performanceof laying hens except for ADFI (P < 0.05) thatwas greater for hens fed coarse-ground cereals (10-mmscreen) than for hens fed medium- or fine-ground cereals(6- or 8-mm screens). Consistent with these results,Vandenboorn (1993) found that when the corn portionof the diet was milled to pass through a 9- vs. a 3-mmscreen, egg production and FCR of hens from 22 to 36wk of age were not affected. Furthermore, Hamilton andProudfoot (1995) observed that BW, egg production,egg weight, and FCR of SCWL from 20 to 70 wk of agewere not affected when diets based on 57% soft wheatwere ground fine or coarse. Maclsaac and Anderson(2007) reported that coarsely ground grains (corn andwheat, milled to pass through a 7- vs. a 5-mm screen)did not affect egg production, egg weight, ADFI, orFCR of SCWL from 20 to 64 wk of age, which, exceptfor ADFI, is in agreement with our results. The authorshave not found any scientific report that studiedthe influence of GMD of durum wheat on productiveperformance of brown egg-laying hens. Afsharmanesh to 470, 560, and 630 µm in broilers from 1 to 21 d ofage and did not find noticeable differences among dietson AME, CP, and P digestibility or on productiveperformance. However, Nir et al. (1994) and González-Alvarado et al. (2007, 2008) found that an increase inparticle size of the diet of broilers was associated withincreased gizzard weight, reduced gizzard pH, and improvednutrient digestibility. González-Alvarado et al.(2007) indicated that coarse particles accumulate in thegizzard, stimulating organ development and increasingthe reflux of the digest from the intestine to the upperpart of the gastrointestinal tract. However, in theirtrial, no differences in broiler productivity were foundas a consequence of increasing GMD. These observationsconfirm the suggestion that the ability of poultryto grind grains in the gizzard is high and that undermost practical conditions, a reduction in GMD of thediet will not improve productive performance.
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