Influence of delayed placement and dietary lysine levels on small intestine morphometrics and performance of broilers

Revista Brasileira de Ciência Avícola

Jrg Franco²  Ae Murakami²  Mrm Natali¹  Erm Garcia²  Ac Furlan² 

[1] ,Universidade Estadual de Maringá Programa de Pós Graduação em Zootecnia

关键词: Abdominal fat;    intestinal mucosa;    ideal protein;    yolk sac;    villi;   

DOI  :  10.1590/S1516-635X2006000400006

来源: SciELO

【 摘 要 】

This experiment studied the influence of delayed placement (HI) and digestible lysine level (DL) on the morphometrics of the intestinal mucosa and on the performance of broilers. A total number of 1,705 Cobb 500 male chicks were used in a completely randomized experimental design in a factorial arrangement with four HI (12, 24, 36 and 48h), and two DL level in the starter diet (1.143 and 1.267%), with four replicates and 55 birds per experimental unit. The amino acids methionine-cystine, threonine, and tryptophan were balanced according to the ideal protein (IP) concept. Small intestine morphometrics was evaluated using histology slides of the duodenum and jejunum. There was no interaction between HI and DL levels for any of the studied parameters. The 1.143% level of DL promoted better performance results at 21 and 42 days of age, as well as higher duodenum and jejunum crypt depth, and duodenum villi height at 21 days of age. HI negatively influenced the morphometrics of the small intestine during the starter phase, and the performance of broilers up to 42 days of age. There was no effect of the treatments on yolk sac utilization or abdominal fat percentage. It was concluded that the use of 1.143% DL and HI of 12 hours promoted better development of the small intestine mucosa up to 21 days of age, and broiler performance at market age.

【 授权许可】

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