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Effects of corn particle size and physical form of the diet on the gastrointestinal structures of broiler chickens

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Effects of corn particle size and physical form of the diet on the gastrointestinal structures of broiler chickens

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Título Effects of corn particle size and physical form of the diet on the gastrointestinal structures of broiler chickens
Autor Dahlke, Fabiano
Ribeiro, Andrea Machado Leal
Kessler, Alexandre de Mello
Lima, Alexandre Rocha
Maiorka, Alex
Abstract The objective of this experiment was to investigate the effects of different particle sizes, expressed as Geometric Mean Diameter (GMD) of corn (0.336mm, 0.585mm, 0.856mm and 1.12mm) of mash and pelleted broiler chicken diets on the weight of the gizzard, duodenum and jejunum+ileum; on the pH of the gizzard and small intestine and on the characteristics of the duodenal mucous layer (number and height of villi and crypt depth) in 42-day-old broilers. The physical form and the particle size of the diet had no significant effect on gizzard and intestine pH (p > 0.05). A greater gizzard weight was seen in the birds receiving pelleted diet and particle size of 0.336mm (p £ 0.008). However, for the particle sizes of 0.856 and 1.12 mm, a greater weight was found in birds that received mash diet (p £ 0.039 and p £ 0.006, respectively). Also, gizzard weight was greater with increasing corn GMD independent of the physical form of the diet. In the mash diet, the increase in particle size promoted a quadratic response in the weight of duodenum and jejunum + ileum. The pelleted diet promoted a greater number of villi per transverse duodenum cut (p £ 0.007) and greater crypt depth (p < 0.05). As the particle size increased, there was a linear increase of villus height and crypt depth in the duodenum, irrespective of the physical form of the diet.
Contido em Revista brasileira de ciência avícola= Brazilian journal of poultry science. Campinas, SP. Vol. 5, n. 1, (jan./abr. 2003), p. 61-67
Assunto Aparelho digestivo
Frango de corte
Milho
Nutricao animal
[en] Crypt depth
[en] Geometric mean diameter
[en] Intestine pH
[en] Intestine weight
[en] Villus height
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/19741
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