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      Influence of feed particle size and feed form on productive performance, egg quality, gastrointestinal tract traits, digestive enzymes, intestinal morphology, and nutrient digestibility of laying hens reared in enriched cages

      1 , 2 , 1 , 3 , 4 , 5
      Poultry Science
      Oxford University Press (OUP)

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          A total of 640 Lohmann LSL hens were randomly allotted to 4 dietary treatments arranged in 2 × 2 factorial with 2 feed particle sizes (fine and coarse) and 2 feed forms (mash and crumble). The 2 particle sizes were achieved by grinding whole corn and wheat in the hammer mill to pass through 4- and 8-mm sieves. The laying hen diet was isonutritive, and each diet was fed to 8 enriched cages of 20 hens from 21 to 52 wk of age. Screen size and feed form did not affect feed intake, egg production, egg weight, egg mass, and quality traits of the eggs, except for yolk color score, which decreased with crumbling of the feed. Feed conversion ratio was greater (P < 0.01) in hens fed the coarsely ground diet than in hens fed the finely ground diet. Crumbling the feed increased (P < 0.01) feed intake and feed conversion ratio compared to those after mashing. The relative weight of the liver and length of the small intestines were greater (P < 0.05) in hens fed crumble than in hens fed mash. Finely grinding cereals decreased (P < 0.01) the pancreas and gizzard weight compared to those after coarse grinding. The pH of digestive organs showed significant responses to feed form. Crumbling resulted in increased (P < 0.01) pancreatic activities of amylase, while lipase secretion was not affected by the manipulations in screen size and feed form. Ileal villus measurements (villus height, villus height/crypt depth ratio, villus surface area) were greater (P < 0.01) in hens fed crumble than in hens fed mash, whereas particle size had no effect. Total tract digestibility coefficients of crude ash and ether extracts were improved narrowing screen size from 8 to 4 mm. Data illustrated that grinding cereals to pass through a 4-mm screen could improve the efficiency of feed conversion. However, feeding crumbles provided no benefit to productive performance and egg quality, although the absorptive capacity of laying hens increased.

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          Author and article information

          Poultry Science
          Oxford University Press (OUP)
          September 2019
          September 01 2019
          March 06 2019
          September 2019
          September 01 2019
          March 06 2019
          : 98
          : 9
          : 3787-3801
          [1 ]General Directorate of Research, Erbeyli Experimental Station, Aydın-Turkey
          [2 ]Department of Animal Science, Faculty of Agriculture, Aydın Adnan Menderes University, Aydın-Turkey
          [3 ]Aydın Adnan Menderes University, Koçarlı Vocational Scholl, South Campus, Aydın-Turkey
          [4 ]Chemistry Department, Aydın Adnan Menderes University, Aydın-Turkey
          [5 ]Department of Histology and Embryology, Faculty of Medicine, Aydın Adnan Menderes University, Aydın-Turkey
          © 2019




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