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Descripción
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| The influence of mean particle size (GMD) of diets based on corn or barley on the development of the gastrointestinal tract (GIT) and body measurements (pullet and tarsus length) was studied in brown-egg laying hens at 49 wk of age. Diets formed a 2 × 5 factorial with 2 main cereals (corn vs. barley) and 5 GMD of the cereal (4, 6, 8, 10, and 12 mm screen). Main effects and interactions among main effects were analyzed and treatment sum of squares for the particle size was partitioned into linear (L) and quadratic (Q) effects. All diets had similar nutrient content per kcal of AMEn and were fed from 17 to 49 wk of age. Each treatment was replicated 5 times (10 hens per cage). The average GMD ± GSD across the 5 screen sizes was 1,143 ± 2.16 ?m for the corn diets and 1,311 ± 2.06 ?m for the barley diets. The GMD ± GSD across cereals varied from 1,003 ± 2.04 ?m for the 4-mm screen diets to 1,427 ± 2.14 ?m for the 12-mm screen diets. At 49 wk of age, 2 hens per replicate were randomly selected, weighed individually, and euthanized by CO2 inhalation. The full GIT, liver, gizzard, and proventriculus were excised and weighed, and the organ weight was expressed relative (%) to live BW. The pH of the gizzard content was measured in situ. The relative length (cm/kg BW) of the small intestine and the 2 ceca and the length of the hens from the tip of the beak to the end of longest phalanx, and tarsus were also measured. No interactions between type and GMD of the cereal were observed for any of the traits studied. Hens fed barley had heavier full GIT (127 vs. 121 g/kg BW; P < 0.001) and gizzard (29.1 vs. 27.7 g/kg BW; P < 0.05) than hens fed corn but none of the other GIT traits or body measurements was affected by the main cereal of the diet. In summary, feeding barley improved the development of the GIT including the gizzard as compared with feeding corn. Mean particle size of the cereal fed during the laying period did not affect the development of the GIT of the hens. | |
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Internacional
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Si |
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Nombre congreso
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Poultry Science Association |
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Tipo de participación
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960 |
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Lugar del congreso
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Louisville, Kentucky |
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Revisores
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Si |
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ISBN o ISSN
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0032-5791 |
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DOI
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Fecha inicio congreso
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27/07/2015 |
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Fecha fin congreso
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30/07/2015 |
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Desde la página
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145 |
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Hasta la página
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145 |
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Título de las actas
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Influence of mean particle size of the main cereal of the diet on gastrointestinal tract traits and body measurements of brown-egg laying hens fed corn or barley based diets. |